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Storage Middleware

Storage Middleware. GridPP12, Brunel, 31-32 Jan 2005 (or 0-1 Feb 2005) j.jensen@rl.ac.uk. Goals - reminder. Provide SRM interfaces to tapestore at RAL Deploy ed for Tier 1 Provide SRM interfaces to disk Release for use by Tier 1 and 2 Local Storage Management

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Storage Middleware

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

  2. 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

  3. 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

  4. 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

  5. (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 • Can fall back to only one (which may be dCache) SRM to disk array

  6. (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

  7. 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

  8. 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

  9. 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

  10. (Potential) Long Term Strategy • Experience shows we need to be flexible • But try to avoid duplicate effort • Extend collaborations? SRM to ADS Storage Element SRM to disk dCache + dCache-SRM DPM SRM to disk array

  11. 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?

  12. 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…

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