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					  Storage Middleware

GridPP12, Brunel, 31-32 Jan 2005
       (or 0-1 Feb 2005)
       j.jensen@rl.ac.uk

                          J Jensen
                          CCLRC/RAL
                   Goals - reminder

• Provide SRM interfaces to tapestore at RAL
  – Deployed for Tier 1
• Provide SRM interfaces to disk
  – Release for use by Tier 1 and 2
• Local Storage Management
  – Something that manages storage




                                      J Jensen
                                      CCLRC/RAL
                   L1 Deliverables,
                     spring 2005
• End of January 2005 (PM05):
  – Was: “release coinciding with LCG3”
  – Became: “…coinciding with gLite RC”
  – Is now: “release for production”
• End of March 2005 (PM07):
  – Was: release coinciding with DJRA1.3
  – Became: release coinciding with gLite


                                     J Jensen
                                     CCLRC/RAL
                    Acceptance tests

• SRM tests – SRM interface must work with:
  – srmcp (the dCache SRM client)
  – GFAL
  – gLite I/O (but gLite I/O still volatile )
• Disk pool test – must work with
  – dccp (dCache specific)
  – Plus SRM interface on top, because we happen
    to have one


                                        J Jensen
                                        CCLRC/RAL
                                     (Short Term)
                                       Strategy
  • Look at both EDG SE and dCache

                                                                    SRM to
                                                                     ADS

                Storage Element
                                                                    SRM to
                                                                     disk
             dCache + dCache-SRM

Look at both to meet all goals:
• Some duplicated effort, but helps mitigating risks                SRM to
• Can fall back to only one (which may be dCache)                  disk array


                                                       J Jensen
                                                       CCLRC/RAL
                           (Short Term)
                             Strategy
• Goal changed – so we focus on dCache

                                                SRM to
                                                 ADS

       Storage Element
                                                SRM to
                                                 disk
     dCache + dCache-SRM


                                                SRM to
                                               disk array


                                   J Jensen
                                   CCLRC/RAL
                    Current status – SE
• SRM interface to ADS (tapestore at RAL)
• Also interfaces to disk
• Tested
  – Tested with GFAL (earlier versions, <1.3.7, and latest,
    1.5.2)
  – Tested with srmcp (the dCache client)
  – Doesn’t work on SL yet, subtle reason
• Extensive and ambitious roadmap
  – Disk cache: improve cleanup, pin, guaranteed
    reservation?
  – ACLs, extend SRM compliance, or build 3.0
  – More useful metadata
                                            J Jensen
                                            CCLRC/RAL
                    Current status –
                        dCache
• Interfaced to ADS tapestore
  – Work with Tier 1 staff
  – Needs more (stress) testing
• Wrote added additional extra
  supplementary documentation
• Tested
  – Works with srmcp (it’s own client!)
  – What about GFAL?
  – Problems? Have to pass upstream
                                      J Jensen
                                      CCLRC/RAL
                           Confused…?

• For this release, focusing on dCache
   – More widely used, more expertise around
   – Has SRM 1 interface
• Continuing work on SE
   – Interfaced to ADS
   – Has SRM 1 interface
   – Will port to SL
• SE classic?
   – Not SRMs
   – Not supported by us

                                          J Jensen
                                          CCLRC/RAL
                          (Potential) Long
                           Term Strategy
1.Experience shows we need to be
  flexible
2.But try to avoid duplicate effort
                                                   SRM to
3.Extend collaborations?                            ADS

        Storage Element
                                                   SRM to
      dCache + dCache-SRM                           disk


             DPM
                                                   SRM to
                                                  disk array


                                      J Jensen
                                      CCLRC/RAL
                           Questions

• What is the future of CERN’s DPM?
  – We plan to test it
  – Discussed collaboration…
• Should we start implementing SRM 3?
  – Some technical issues
    • SRM API related, e.g. delete, and directories
    • Various interop issues in 1.{0,1}
    • No SRM implementation supports full API
• Will/has dCache go(ne) Open Source?
                                           J Jensen
                                           CCLRC/RAL
                          Issues?

• Only Edinburgh and Glasgow and RAL T1
  attend our phone conferences
• Need to ensure coordination with T2
  deployment managers
• Coordination with Tier 1 being sorted out
  as we go along…
  – Some common goals
  – And we need access to resources
• Lots of stuff to do…
                                      J Jensen
                                      CCLRC/RAL

				
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