HP Simply StorageWorks Introduction to storage technologies

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HP Simply StorageWorks Introduction to storage technologies Powered By Docstoc
					HP Simply StorageWorks
Introduction to storage technologies


                  Whether your business is large or small, data is               At HP, we understand servers, business applications
                  critical to your operations. In fact, it’s at the very heart   and storage. In fact, we’ve dedicated significant
                  of your company—and there’s more of it than ever.              resources to ensuring that these elements integrate
                  In many businesses, the volume of data doubles                 with each other to address the needs of small and
                  every year.                                                    medium businesses in a simple and affordable way.
                                                                                 And we’ve created this guide to help you make sense
                  The problem is, how do you handle this explosive
                                                                                 of data storage for your business. Read it cover to
                  growth? How can you be sure you can access your
                                                                                 cover, or refer to it when researching specific storage
                  data quickly? And how do you back it up in case of
                                                                                 solutions. However you use it, this guide will give you
                  an emergency, a disaster, a power outage, or an
                                                                                 the knowledge to make informed decisions about data
                  audit that goes back five years? There are so many
                                                                                 storage and protection.
                  confusing choices for data protection and storage
                  solutions, so many buzzwords and so much jargon-
                  filled tech-speak—and so little guidance on which
                  solution is the right choice to meet your business
                  objectives.
Table of contents



Introduction to storage technologies . . . . . . . . . . .          .   .   .   .   .   .   . .1
Storage technologies at a glance . . . . . . . . . . . . .          .   .   .   .   .   .   . .3
Moving your data: storage networking options . . .                  .   .   .   .   .   .   . .4
Comparing disk drive technologies . . . . . . . . . . .             .   .   .   .   .   .   . .5
Choosing the appropriate online storage strategy .                  .   .   .   .   .   .   . .5
Choosing the appropriate data protection strategy .                 .   .   .   .   .   .   . 10
Added value from HP . . . . . . . . . . . . . . . . . . . .         .   .   .   .   .   .   . 13
What to do now . . . . . . . . . . . . . . . . . . . . . . . .      .   .   .   .   .   .   . 13
HP Services . . . . . . . . . . . . . . . . . . . . . . . . . . .   .   .   .   .   .   .   . 14
Jargon buster—glossary . . . . . . . . . . . . . . . . . . .        .   .   .   .   .   .   . 15
HP Simply StorageWorks                                    Online storage
Designed specifically for small and midsize               Storage for information that is regularly accessed
companies, HP Simply StorageWorks delivers better         by clients and servers is often referred to as online
business outcomes by bringing together the tools,         storage, and its properties and functional attributes
solutions, products, and services to help you navigate    differ from those of storage that’s used for data
the storage landscape, bridging the gap between the       protection or disaster recovery. Online storage is
data explosion and your IT infrastructure. With simple,   typically in one of two categories—file or block—
affordable, and reliable storage and data protection      depending on the type of data and the access
solutions, HP and our channel partners can help you       method. The typical office productivity applications
improve the efficiency, performance, and continuity of    retrieve data as files (.doc, .pdf, .gif, .mp3, and others)
your business.                                            on a file system. This is called file access. Some other
                                                          applications, such as databases, virtual machine

Storage technologies at                                   hypervisors, and e-mail, can get direct access to
                                                          blocks of data without the overhead of a file system.
                                                          This is known as block access.
a glance                                                  It’s important to remember that because different
Before we dive into the details of the various storage    applications store and access data in different ways,
technologies, it’s important that we take a high-level    most environments are likely to need both types of
look at the available types of storage and data           data access.
protection paradigms.




                                                                                                                  3
                                                        However, with the advent of lower-cost disk arrays,
                                                        disk-based data protection has been making inroads
                                                        into areas where physical tape drives were once the
                                                        primary means of data protection. Disk-based data
                                                        protection increases backup performance and allows
                                                        storage of more backup data online for longer periods
                                                        of time, providing fast access to an increased number
                                                        of available “recovery points.”

                                                        Disk-to-disk-to-tape (D2D2T) is a two-stage backup
                                                        process that combines disk-based and tape-based
                                                        data protection to achieve the benefits of both.
                                                        Solutions using D2D2T draw on the speed and
                                                        efficiency of disk along with the portability, longevity,
                                                        and cost-effectiveness of tape.

                                                        Finally, two key metrics can help you assess the
                                                        needs of your business. The first is the recovery time
                                                        objective (RTO), which is the amount of time a business
                                                        process can be down. The second, the recovery point
This guide will discuss four types of storage
                                                        objective (RPO), is the amount of data you can afford
architectures:
                                                        to lose. For 24x7 applications, the RPO could be the
•	Direct attached storage (DAS)—the simplest type       most recent transaction; for file servers, it could be last
  of data storage, located in or attached directly to   night’s backup.
  a server
•	Network attached storage (NAS)—a dedicated file
  server attached to a local area network, running an   Moving your data:
                                                        storage networking
  operating system that is specifically dedicated to
  file serving
•	Storage area network (SAN)—a dedicated network
  for storage traffic between servers and a disk        options
  storage array or tape device
                                                        Because of high data volumes and applications’ fast
•	Hybrid or unified NAS/SAN (NAS gateway)—a             data access needs, data storage often requires higher
  combination of a NAS gateway with a SAN and           transmission speeds and greater bandwidth than the
  a hybrid NAS/SAN, with a simple management            typical network provides.
  interface to hide complexity
                                                        Listed here are some of the networking protocols
Data protection technologies                            found in today’s storage subsystems:
Because data is the lifeblood of your business, data
protection equates to business protection. Depending    Fibre Channel (FC)—The low-latency Fibre Channel
on your business needs, both tape and disk-based        protocol is designed specifically for larger, more
protection strategies can be implemented to meet        demanding environments and storage networks,
increasingly demanding backup and recovery              providing a high level of performance and reliability
requirements.                                           when used between servers and storage devices.

Tape-based data protection is still the most cost-      IP SCSI—iSCSI is a method of connecting servers and
effective technology for high-capacity and long-term    storage via an Ethernet. A dedicated 1 Gb/s Ethernet
data protection. In addition, it offers a number of     network will provide sufficient bandwidth to connect a
other advantages imperative for disaster recovery and   storage device to several servers.
archival, including its small size, removability, and
long shelf life.




                                                                                                                4
Disk drive technologies comparison

                            Serial ATA (SATA)           SCSI                       Serial-attached             Fibre Channel
                                                                                   SCSI (SAS)

Price per GB                Low                         Moderate                   Moderate                    High

Capacity                    Highest                     Moderate                   Moderate                    Moderate

Reliability                 Moderate                    High                       High                        High

Performance                 Low                         High                       High                        High

Scalability                 Moderate                    Low                        Moderate                    High

Data access                 Moderate                    Frequent                   Frequent                    Frequent

Best use                    File storage,              Business transactions and   Business transactions and   Business transactions and
                            archival/backup, secondary primary applications        primary applications        primary applications
                            applications




Serial-attached SCSI (SAS)—With the introduction of                    high availability that online applications and storage
shared DAS systems, SAS is an emerging option for                      require. Individual SAS disk drives offer less capacity
networked application storage. This is an easy and                     than SATA disks, but deliver greater performance
low-cost way to share storage among a fixed number                     and can be grouped together in various RAID
of direct-connected servers.                                           configurations to reach virtually any capacity point.

                                                                       Fibre Channel (FC)—Fibre Channel (FC) disk drives
Comparing disk drive                                                   are designed primarily for rapid data throughput
                                                                       for high-capacity, performance-intensive, and highly
technologies                                                           available storage systems that require maximum
                                                                       scalability. With the highest cost per gigabyte of
You can deploy various disk drive technologies—each                    the options described here, FC disk drives are a
with different yet complementary benefits—across                       good choice for the most demanding mission-critical
your storage network. Here are some of the disk drive                  applications.
technologies used in today’s storage systems:

Serial ATA (SATA)—If performance is not a primary
consideration and your business requires high-
                                                                       Choosing the
capacity, cost-effective storage for file serving,
archival data, or reference information, then serial
                                                                       appropriate online
advanced technology attachment (SATA) is a perfect
choice. SATA disks provide a much lower cost per                       storage strategy
gigabyte than SCSI, SAS, or Fibre Channel disks.                       The storage scenarios discussed on the following
Serial-attached SCSI (SAS)—Featuring greater                           pages will explain the benefits and weaknesses of the
performance than SATA disks, serial-attached SCSI                      various storage architectures, preparing you to choose
(SAS) disk drives deliver the speed, reliability, and                  the right mix of technologies for your needs.




                                                                                                                                           5
              Direct attached storage (DAS)
                  Clients




                                           Application servers                            Public LAN




                    D
                 •	 	 irect	attached	storage	can	refer	to	the	drives	inside	a	server	
                    or to an external storage enclosure


Direct attached storage (DAS)                           DAS in brief
The simplest type of data storage is called direct
                                                        What it is          Storage in or attached directly to a server
attached storage (DAS). In a DAS configuration
one or more data storage components, such as            Advantages          •	Low	initial	cost	and	easy	to	implement
hard disks or tape drives, are either installed in a                          D
                                                                            •		 oes	not	require	storage	expertise;	managed	by	
                                                                              the server’s operating system
computer or connected directly to it—often with a
SCSI or SAS link. One emerging storage option is        Disadvantages         S
                                                                            •		 ervers	cannot	share	storage	capacity,	which	
shared DAS, in which a fixed number of servers are                            causes “islands” of capacity—one server’s
                                                                              storage is at 99 percent use, another at 5
connected directly to a storage system instead of                             percent use
using a storage network, or fabric.                                         •	Does	not	scale	up	well

In direct attached storage (DAS), each server is                              D
                                                                            •		 ifficult	to	manage	if	there	are	more	than	a	
                                                                              couple of servers
configured with its own separate storage.
                                                        Use DAS if . . .      I
                                                                            •		mmediate	startup	cost	is	your	only	consideration
Example of a real-world DAS solution                                        •	You	have	no	plans	to	grow	in	the	future
The HP StorageWorks 60 Modular Smart Array
(MSA60) is an example of DAS storage. This
                                                                                 Y
                                                        Do not use it if . . . •		 ou	have	many	servers	to	be	interconnected	with	
12-drive disk enclosure supports both SATA and SAS                               centralized storage
hard drives and offers quick and easy expansion for
individual servers.
                                                        Shared DAS in brief
Example of shared DAS
                                                        What it is            Shared storage connected directly to a small, fixed
The HP StorageWorks 2000sa Modular Smart                                      number of servers
Array (MSA2000sa) allows up to four servers to
share a common pool of disks. The MSA2000sa             Advantages              R
                                                                              •		 educed	cost	and	complexity	because	there	is	no	
                                                                                storage networking infrastructure
supports data protection features such as snapshots
                                                                              •	Easy	to	deploy	and	manage
and cloning, and it can be expanded with three
additional drive shelves.                               Disadvantages           D
                                                                              •		 oes	not	scale	beyond	a	small	number	of	servers
                                                                              •	Limited	distance	between	servers	and	storage

                                                        Use if . . .            Y
                                                                              •		 ou	are	setting	up	a	small	application	cluster	with	
                                                                                two to four servers

                                                        Do not use it if . . . •	More	than	four	servers	need	shared	storage
                                                                                Y
                                                                              •		 ou	need	to	connect	other	devices	such	as	tape	
                                                                                to a switched storage network




                                                                                                                                  6
               Network attached storage (NAS)
                 Windows clients      Linux/UNIX clients                                Network
                 using CIFS           using NFS                                         printer




                                                                                       Public LAN
                                        File I/O traffic




                                                                        NAS device


Network attached storage (NAS)                             NAS in brief

Network attached storage (NAS) is essentially a            What it is          Dedicated storage server attached to local area
dedicated file server running an operating system that                         network, running OS tuned specifically for file
                                                                               serving
is designed and tuned specifically to handle file I/O
traffic for network clients.                               I/O                 File I/O

Client computer access to the NAS server is usually        Advantages          •	Simple	and	economical;	low	TCO

over an Ethernet connection. The NAS server                                    •	Options	for	small	business	through	enterprise

appears on the network as a single node, with its                                W
                                                                               •		 orks	well	in	multi-OS	environments	(Windows,	
                                                                                 Linux, Macintosh…)
own IP address. Files stored on the NAS system
                                                                                 O
                                                                               •		 n-demand	assignment	of	file	shares	to	clients	
are accessible to clients on the LAN over the                                    and servers
Ethernet connection via protocols such as CIFS/SMB
(Windows® clients) or NFS (Linux and UNIX®). Many          Disadvantages         U
                                                                               •		 ses	public	LAN;	can	still	have	bottlenecks

NAS systems also support protocols such as HTTP or                               S
                                                                               •		 erver	device	can	be	single	point	of	failure

FTP for Internet-based file access.                        Use NAS if . . .      Y
                                                                               •		 ou	need	economical,	easy-to-administer	file	
                                                                                 serving over the existing network infrastructure
NAS products range from low-cost home office–
quality devices up to fully clustered enterprise NAS                                Y
                                                           Do not use it if . . . •		 ou	are	trying	to	add	capacity	for	an	application	
                                                                                    server such as a database or e-mail system
gateways that connect to a SAN.

In network attached storage (NAS), all clients have
access to the same storage via the local area network
(LAN).

Example of a real-world NAS solution
The HP ProLiant ML110 G5 Storage Server is a NAS
file server solution for small offices with less than 50
employees. This solution draws on your skill set and
investment in ProLiant servers and Windows Server
operating systems.




                                                                                                                                    7
                                                      Storage area network (SAN)
                                                                  Clients




                                                                             Application servers                           Public LAN



                                                                                                         Storage area
                                                                            Block I/O                    network (Fibre
                                                                            traffic                      Channel or iSCSI)




                                                                                                          Storage array



Configuration software: In a SAN,
once the servers are physically        Storage area network (SAN)                                  SAN storage in brief

connected to a disk array, you
                                       A storage area network (SAN) is just that—a network         What it is           Separate network dedicated to storage connecting
need configuration software to
provision that storage capacity        that is dedicated to storage. The SAN is separate                                servers to external disk subsystems
to specific applications running       from the LAN and provides servers with access to            I/O                  Block I/O
on the server. The configuration
software could be in a form of an
                                       storage. The network is designed to handle storage
application that runs on one of        communications.                                             Advantages             M
                                                                                                                        •		 ultiple	servers	can	share	common	pool	of	
the connected servers or software                                                                                         storage
that runs directly from the storage    In its simplest form, a SAN consists of:                                           M
                                                                                                                        •		 ore	efficient	and	flexible	capacity	utilization	for	
device.                                                                                                                   lower TCO
Physical disk configuration: The
                                       •	Shared storage (typically a disk array)
                                                                                                                          I
                                                                                                                        •		mproved	scalability,	reliability,	and	resource	
first step of configuration involves   •	The dedicated network that lets servers and storage                              management
grouping physical disks together
into a RAID group based on               “talk” to each other                                      Disadvantages          M
                                                                                                                        •		 ore	complex	to	set	up	than	a	basic	LAN
performance, redundancy, and
capacity requirements. RAID
                                       •	Software that configures the shared environment                                  O
                                                                                                                        •		 ften	requires	knowledge	of	storage	
                                                                                                                          configuration and management
technology protects the disks in the   •	Components to protect data in the SAN
SAN from physical drive failures                                                                                          D
                                                                                                                        •		 oes	not	support	file	sharing	directly;	instead	
and can improve application                                                                                               uses a file server or NAS connected to the SAN
performance by spreading data
                                       To promote optimal performance, the network
reads/writes across multiple disks.    between storage and servers is typically Fibre              Use a SAN if . . .     Y
                                                                                                                        •		 ou	need	the	fastest	data	access	speeds	through	
                                                                                                                          a network such as Fibre Channel
Logical disk configuration: Once       Channel, multi-gigabit iSCSI, or another high-speed
                                                                                                                          Y
                                                                                                                        •		 ou	want	a	backup	solution	that	reduces	server	
RAID groups have been created,         link.
portions of them can be assigned                                                                                          and LAN utilization
to one or more servers. The
                                       A storage area network (SAN) is a high-speed                                         Y
                                                                                                   Do not use it if . . . •		 ou	have	only	a	single	server	and	a	few	
software carves out portions of
the disk capacity and allots that      network—only for storage—that is separate from the                                   workstations
capacity to the corresponding          public LAN.                                                                      •	Cost	is	the	primary	decision	factor
server. For example, there may be
2.5 terabytes of storage protected
                                       Example of a real-world SAN solution
in a RAID 5 configuration, with
three servers attached to the SAN.     The HP StorageWorks 2000i Modular Smart Array
The appropriate capacities are         (MSA2000i) enables up to 16 servers to share a
selected and assigned to each
server.
                                       common pool of disks across an Ethernet network.
                                       The MSA2000i supports data protection features such
                                       as snapshots and cloning and can be expanded with
                                       three additional drive shelves.




                                                                                                                                                                              8
              NAS gateway with storage area network (SAN)
                            Clients



                                                                       File I/O traffic

                                                                                   Public LAN


                                                          NAS gateway



                                                                       Storage area network
                                                                       (Fibre Channel or iSCSI)


                                                                     Storage array




NAS gateway with a SAN                                  NAS/SAN hybrid storage in brief

One common use of a storage area network is to store    What it is            Network attached gateway into a storage area
file data, providing access to that data via a NAS                            network
gateway. The gateway has no on-board storage of         I/O                   •	File	I/O	(NAS)
its own; instead, it connects to a SAN and acts as a
                                                                              •	Block	I/O	(SAN)
translator between the file-level NAS protocols, such
as NFS and CIFS, and the block-level SAN protocols      Advantages            •	Large	administrative	cost	savings

such as Fibre Channel and iSCSI. This NAS/SAN                                   C
                                                                              •		 ombines	the	superior	performance	and	
                                                                                reliability of SAN with the simplicity of NAS
hybrid combines the advantages of both technologies.
                                                        Disadvantages           P
                                                                              •		 urchasing	a	complete	solution	is	more	costly	
Using a NAS gateway to a SAN combines the                                       than purchasing just individual components
advantages of both technologies, providing both file                          •	Requires	management	of	both	devices
and block I/O.
                                                        Use a NAS/SAN           Y
                                                                              •		 ou	want	to	consolidate	many	independent	file	
                                                        hybrid if . . .         servers into a single, IT managed environment
Example of a real-world NAS/SAN solution
                                                                                Y
                                                                              •		 ou	want	equal	access	to	file-	and	block-based	
The HP ProLiant DL380 G5 or SB460c SAN Gateway
                                                                                data
Storage Server connected to the MSA2000 or
EVA4400 provides easy access to data for clients and                             A
                                                        Do not use it if . . . •		 	small,	simple	storage	solution	is	required

servers in whatever method required—file or block.




                                                                                                                                   9
                                                            HP StorageWorks continuum for business continuity and availability
                                                                                        Mission Critical Support Services




       Data loss (recovery point objective)
                                                                                                                                                    Cost
                                                                                                                                 Server clusters,
                                                               Increased                                                         Storage clusters   High
                                                     Last      availability
                                              transaction                                                                     Remote mirrors
                                                                                                                            Remote snaps/clones

                                                 Minutes
                                                                                                       Snaps/Clones/Mirrors
                                                                                                      Continuous data protection

                                                   Hours

                                                                                               Disk-to-disk
                                                                                             and virtual tape
                                                   Days                       Tape
                                                                                                                                                    Low

                                                        Days                   Hours           Minutes           Seconds        “Instant”
                                                                                     Recall (recovery time objective)



Choosing the                                                                                                    Archival or long-term storage is used to keep
                                                                                                                information accessible, even when the data no longer
                                                                                                                has to be online.
appropriate data
                                                                                                                Traditional tape-based data
protection strategy                                                                                             protection
Reliable data protection is one of the most important                                                           One popular way to back up or archive data is to
challenges facing business today. In the event of any                                                           copy it to magnetic tape. Tape has been used for
threat to data—including a “worst-case scenario” with                                                           data protection for over 50 years, and it is still the
multiple system failures occurring at the same time—it                                                          most cost-effective technology for high-capacity and
is essential to have the appropriate data protection                                                            long-term data protection. Tape offers a number of
and recovery strategy in place. Large businesses                                                                advantages that have yet to be eclipsed by other
are no longer the only organizations to require                                                                 technologies:
sophisticated data protection strategies. Indeed,                                                               •	Tape media are small and removable and can thus
research suggests that backup and recovery are the                                                                be easily stored offsite, which helps easily increase
top IT priorities among small and midsized businesses.                                                            capacity.
Accordingly, smaller companies are also looking for
                                                                                                                •	Shelf life of up to 30 years makes tape a
advanced data protection features with high levels of
                                                                                                                  dependable medium for archival.
availability and recovery.
                                                                                                                •	Tape is very low-cost on a per-gigabyte basis—
The types of data storage required will depend on                                                                 as well as low-cost in comparison with other
how that storage is used:                                                                                         technologies.
Backup storage is used to restore data and systems                                                              •	Automated library solutions can easily be integrated
in the event of a disk or hardware failure in an online                                                           into many environments to provide high-capacity
system. Disaster recovery is a higher-level function of                                                           multiple-cartridge backup, and they can automate
backup storage, often implemented across physical                                                                 data protection for multiple devices on the network.
sites and geographies. As a rule, in backup access
you want easy access and fast retrieval; speed is
important.




                                                                                                                                                                   10
     Disk-to-disk-to-tape                              Stage 2
     (D2D2T) backup                                    Disk backup appliance
                                                       (virtual tape)


                             Clients                   Tape drive (LTO4)




                                                                                                              Public LAN
                                                 Stage 1




                                                                           Stage 1: Disk-to-disk backup (D2D)
                                   2 stage multi-tier backup (D2D2T)
                                                                           Stage 2: Data moved from disk-to-tape for archive (D2T)




Comparing tape drive technologies                                  Disk-based data protection
With many different backup solutions available                     If more speed and performance are required,
today, determining the right tape technology for                   disk-based data protection is the answer.
your business can be a confusing process. The great                •	Smaller backup windows and less impact to
majority of tape drives sold today are either DAT                    applications
or LTO:
                                                                   •	Faster recovery of single files
DAT/DDS—The most successful tape backup                            •	High-availability features such as RAID, replication,
technology of all time, with more than 17 million DAT                and hardware redundancy
drives shipped since its introduction, DAT continues
                                                                   •	Features such as deduplication to reduce capacity
to flourish. Its success is due to its ability to meet the
                                                                     requirements and lower costs
needs of the small and medium business market with
its proven track record of dependability—and to its
low media prices, which contribute to a remarkably
                                                                   Two-stage backup and recovery: disk-
low cost of ownership. It is the ideal choice for                  to-disk-to-tape (D2D2T)
customers looking to back up entry-level servers and               While disk-based data protection can remove some
workstations with capacities less than 200 GB.                     of the human error and hardware problems impeding
LTO/Ultrium—For backup environments where                          a tape-based backup process, most environments
greater storage capacities and faster performance                  require the additional protection of tape to protect
are required to meet backup window requirements,                   against all types of risk. Two-stage backup, often
LTO drives are the tape technology of choice for entry             called disk-to-disk-to-tape (D2D2T), combines the
and midrange servers. LTO provides capacities up to                benefits of both disk and tape.
1.6 TB of compressed data per data cartridge with                  Example of a real-world D2D2T solution
exceptional reliability and maximum performance, as                The HP StorageWorks D2D2500 is a 1U disk-based
well as features such as hardware data encryption to               backup system that can store terabytes of backup
prevent unauthorized access to tape cartridges.                    data online for instant recovery—and can easily
                                                                   offload it to an HP StorageWorks Ultrium 1760 Tape
                                                                   Drive with hardware data encryption for archival and
                                                                   critical offsite protection.




                                                                                                                                     11
                 Remote replication




                                                       WAN




Snapshots, clones, and mirrors                              the alternate site. In the event of a disaster, the remote
                                                            copy can be used to get business operations back up
A snapshot takes a “picture” of data at the time of
                                                            and running quickly—or, in some cases, for automatic
the snapshot and stores that information on disk. The
                                                            failover.
snapshots are maintained even as data continues
to change. In the event of data corruption or error,        Real-world replication example
data can be recovered to any previous snapshot.             HP StorageWorks Storage Mirroring is host-based
Snapshots are a complement to disk and tape backup          replication software for local or remote block-level
but do not provide for disaster recovery.                   replication of data between servers.

Clones, or volume copies, are similar to snapshots
                                                            Clustering: server and storage
but physically copy the data (as opposed to taking a
“picture” of the data) to another set of disks within the   clusters
same array. One of the additional benefits of volume        A server cluster is a way to provide protection against
copy is the ability to send a copy to another server for    physical hardware failure in a server environment.
backup, application testing, or data mining.                Multiple physical servers will share a common pool
                                                            of storage in a SAN disk system. The disk system
Remote data replication                                     is designed to be highly redundant, with multiple
Remote replication is a data protection technology          connections to the storage network. In the event of
for disaster recovery in which two identical sets of        a server failure, the workload associated with that
data are stored on distributed systems across multiple      server is automatically moved to another server, or
physical sites. When data is changed at a primary           “node,” in the cluster. Some high-end storage systems
location, those changes are moved, or replicated, to        can also be clustered, providing an additional layer
                                                            of redundancy.




                                                                                                                 12
Added value from HP                                       What to do now
Unlike large corporations, which often have extensive     Now that you’ve learned the jargon and seen the
resources such as specialists dedicated exclusively       various choices available to meet your data storage
to storage, you may not have the time, resources,         requirements, you are better equipped to make
or available expertise to develop effective long-         informed judgments about what you need. To learn
term storage strategies. HP understands that you          more about how choosing HP as your trusted storage
need comprehensive yet easy-to-implement solutions        partner can improve operational efficiency and lower
that work seamlessly with servers and business            storage costs:
applications, bridging the gap between                    •	For information on HP shared storage solutions
explosive data growth and the capabilities of               such as NAS and SAN, see the HP Simply Storage
the IT infrastructure.                                      Consolidation solution guide.
When it comes to storage, HP has the broadest and         •	For information on HP multi-tier backup and recovery
most comprehensive storage portfolio in the industry.       solutions, see the HP Simply Business Protection
You will find simple, affordable, reliable disk storage     solution guide.
systems that can be scaled up as your business grows;     •	To see HP solutions aligned with specific
a comprehensive range of reliable, cost-effective tape      deployments and application environments, see the
storage devices; and dedicated storage software             HP Simply Business Solution briefs for applications
to manage it all. There are scalable, easy-to-use,          such as VMware and Microsoft ® Exchange.
Windows-based network attached storage (NAS) file
and print solutions for small and medium businesses,      To access the above-mentioned material and view the
as well as complete storage area network (SAN)            full portfolio of HP Simply StorageWorks solutions,
solutions that deliver the scalability, performance and   visit:
broad interoperability required for critical data and
                                                           – www.hp.com/storage/simply (United States,
applications. Award-winning HP StorageWorks All-
                                                             Canada, and Latin America)
in-One Storage Systems offer seamless blending of
performance-optimized file serving, shared storage         – www.hp.com/apac/simply (Asia, Australia,
array, and data protection functions under a radically       and New Zealand)
simple management umbrella.




                                                                                                            13
Once you understand the storage
choices, you need to find the right
partner to implement the ideal
solution.




           HP Services                                              Financial services
                                                                    HP Financial Services provides innovative financing
           HP Services for Storage—services and support that        and financial asset management programs to
           make sense for growing businesses                        help customers cost-effectively acquire, manage,
           HP Services can help you build and manage a              and ultimately retire their HP solutions. For more
           storage infrastructure that integrates well with your    information on these services, please contact your
           servers and software and is simple, affordable, and      HP representative or visit
           reliable. We understand the needs of a dynamic           www.hp.com/go/hpfinancialservices.
           business. Therefore, we provide a comprehensive
           range of scalable, affordable services to support disk
           storage systems, tape storage and media, storage
           networks, and archiving solutions.

           For more information about services and support
           from HP, contact your HP sales representative or
           HP-authorized Channel Partner, or visit
           www.hp.com/hps/storage.




                                                                                                                     14
Jargon buster—glossary
The following is an abbreviated look at storage
concepts. If you are already familiar with these
terms, you may simply want to use this list as a quick
reference. If you are new to storage, you can refer to
these definitions as you read through the brochure.


Block I/O—I/O requests to disk storage on a DAS or       iSCSI—short for Internet SCSI; a simple and industry-
SAN                                                      standard method of connecting servers and storage
                                                         over an Ethernet network
Block storage—disk storage that is divided into a
sequence of fixed-size data blocks to which access is    Mirroring—the act of copying data from one location
via read or write actions, one block at a time, on the   to a storage device in real time, ensuring an exact
storage media                                            copy of the original information

Common Internet File System (CIFS)—a file-sharing        Network attached storage (NAS)—dedicated file
protocol used in Windows to map client PCs to file       server (also called a “NAS device”) optimized for file-
shares on servers or NAS devices; also known as a        serving performance and accessible using specialized
server message block (SMB)                               access/sharing protocols

Deduplication—advanced method of eliminating             Network File System (NFS)—a file-level protocol,
redundant data by referencing existing blocks of data    usually associated with UNIX and Linux, to access and
that have previously been stored, storing only data      potentially share data
that is both new and unique, thus greatly reducing
                                                         NetWare Core Protocol (NCP)—a file-level protocol
storage requirements
                                                         associated with Novell NetWare
Direct attached storage (DAS)—storage either inside or
                                                        Redundant array of independent disks (RAID)—a
attached directly to a server, via external hard drives
                                                        method of simultaneously writing data over multiple
or tape drives, and shared with the workstations
                                                        disk drives; used in disk arrays to enhance data
Failover—a backup operation that automatically and      protection and performance
transparently switches to a standby database, server,
                                                        Storage area network (SAN)—a high-speed network
or network if the primary system fails
                                                        that connects different data storage devices to servers;
Fibre Channel (FC)—fast, low-latency topology and       may extend to multiple or remote locations for backup
transport protocol designed to send block-level data    and archival storage
information, specifically for storage networks
                                                        Serial-attached SCSI (SAS)—a.k.a. SAN fabric; an
File I/O—input/output requests to disk storage on a     evolution of parallel SCSI, a cost-effective way to
NAS device or file system on a general-purpose server connect a small, fixed number of servers directly to a
                                                        storage device
File storage—disk storage in the form of data as it is
used by applications and end users                      Serial ATA (SATA)—a serial link, single cable creating
                                                        a point-to-point connection between devices
I/O—short for input/output; any program, operation,
or device that transfers data to or from a computer or  Snapshot—a virtual copy (not an actual copy) of data
peripheral device                                       that imitates the way it looked at the precise time the
                                                        snapshot was taken




                                                                                                           15
Technology for better business outcomes
To learn more, visit
www.hp.com/storage/simply
www.hp.com/apac/simply
© Copyright 2008 Hewlett-Packard Development Company, L.P. The information contained herein is subject
to change without notice. The only warranties for HP products and services are set forth in the express
warranty statements accompanying such products and services. Nothing herein should be construed as
constituting an additional warranty. HP shall not be liable for technical or editorial errors or omissions
contained herein.
Microsoft and Windows are U.S. registered trademarks of Microsoft Corporation. UNIX is a registered
trademark of The Open Group.
4AA2-2869ENW, November 2008