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Cloud storage in the cloud (cloud computing) a new concept of the extension and development of the concept is defined by clustered applications, grid or distributed file system functions in the network a large number of different types of storage devicesapplications together to work together, a common external data storage and business access capabilities of a system. When the core of the cloud computing system operations and handle large amounts of data storage and management, cloud computing systems need to configure a large number of storage devices, cloud computing system is transformed into a cloud storage system, cloud storage is a data storage and management as the core of the cloud computing system.
CONTRIBUTED ARTICLES PROGRAM Cloud Storage Use Cases Today’s storage administrator will almost certainly be getting questions about Cloud based storage. They might be considering it for their organisations, wondering where it might add value, trying to understand the myriad of options emerging on the market. Given that as with many topics related to Cloud there is quite a breadth of services, how is a storage administrator going to understand the services and options? A good way to start is to know what Cloud storage is and then what the major use cases are. What is Cloud storage? One commentator has stated, “Cloud Storage provides whatever amount of storage you require, on an immediate basis. It is persistent. It can be accessed in a variety of ways, both in the data centre where the cloud is housed, as well as via the Internet. If you obtain this from an external provider, it is purchased on a pay as you go basis. You do not manage it, you use it, and the service provider manages it.” Here we can see the attributes that define a service as “Cloud”, such as consumption models, self-service and network access. Cloud storage is also going to a have number of characteristics which may differentiate it from existing models. A tolerance for higher network latency, perception of infinite scale, consumption pricing and access via APIs are good examples. APIs are typically REST based and SNIA has developed the Cloud Data Management Interface (CDMI) as a standard for API access. What is not Cloud storage? One often sees existing storage services that have been given the Cloud label for marketing purposes. The most prolific examples are managed storage services, which have had a name change but little change in their service characteristic, all in order to take advantage of the Cloud bandwagon. Enterprise storage with thin provisioning is not Cloud storage. Also, storage associated with Cloud Computing or Infrastructure as a Service (IaaS) is not Cloud storage, unless they are separate services which you are simply integrating. Typical use cases for Cloud storage are for archive, backup or data access. It is helpful to segment the styles of services into two segments, User or System based. User based Cloud services are those that end users interact with directly. The consumer of the service, the person who interacts with it, configures it and obtains the direct benefit of the service is an end user. There are two popular services in the user based category, backup or synchronised file services. Backup services are very popular. Client software is provided and installed onto the device such as laptop or desktop. These services often provide versioning and encryption. Popular services are those such as Mozy, Crashplan or Optus Smart Safe. Synchronised File Services, whilst also being user based, typically solve a different core problem to backup. These services are for sharing files amongst multiple devices and sometimes multiple users. They provide convenience at being able to access files in many locations. The most popular service in this space would be DropBox. The second segment of Cloud Storage is Systems based. This is where the consumer of the storage is the storage architect or IT services behind the scene, abstracted away from the direct end users. It’s the IT staff that are the consumers of the service, interact with it, configure it and obtain the benefits. Again backup services are popular in Systems based Cloud Storage. Many enterprise backup vendors are adding features to their software to integrate with Cloud storage providers to act as a destination for backup sets. A growing area of Systems based Cloud storage is the use of Cloud Storage Gateways (CSGs). CSGs are virtual or physical appliances which translate more traditional storage protocols such as iSCSI, NFS or CIFS into cloud storage APIs. This provides a mechanism to provide compatibility with existing services and requirements, whilst utilising the different characteristics of Cloud storage for the data at rest. As storage administrators consider Cloud storage they can start to segment to the use cases. Is it for backup for end users or for their backend systems? Is it for file synchronisation services for end users? Is it as displacement for existing protocols and services via a storage gateway? With different styles of Cloud storage in the market, it helps to know your use case, along with which services are and are not Cloud. Rodney Haywood Non-Executive Director SNIA ANZ REST : Representational State Transfer A specific set of principles for defining, addressing and interacting with resources addressable by URIs. Architectures that follow these principles are said to be RESTful. The principles include: abstraction of state into resources and a uniform set of representations and operations (e.g., HTTP verbs like GET and PUT as the only means to manipulate a resource). RESTful interfaces are contrasted with Web Services interfaces such as WBEM, which tend to be RPC-like. API : Application Programming Interface An interface used by an application program to request services. The term API is usually used to denote interfaces between applications and the software components that comprise the operating environment (e.g., operating system, file system, volume manager, device drivers, etc.). CDMI – Cloud Data Management Interface A SNIA Architecture standard for Data storage as a Service (DaaS). CDMI is an interface for both the data path and the control path of cloud storage. CDMI can also be used to manage storage in Cloud Computing deployments.
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