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

2. 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

3. 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

4. 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

5. J Jensen CCLRC/RAL (Short Term) Strategy Look at both EDG SE and dCache Storage Element dCache + dCache-SRM SRM to ADS SRM to disk SRM to disk array Look at both to meet all goals: Some duplicated effort, but helps mitigating risks Can fall back to only one (which may be dCache)

6. J Jensen CCLRC/RAL (Short Term) Strategy Goal changed – so we focus on dCache Storage Element dCache + dCache-SRM SRM to ADS SRM to disk SRM to disk array

7. 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) –Doesnt 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. 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 (its own client!) –What about GFAL? –Problems? Have to pass upstream

9. 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

10. J Jensen CCLRC/RAL (Potential) Long Term Strategy Storage Element dCache + dCache-SRM SRM to ADS SRM to disk SRM to disk array DPM 1.Experience shows we need to be flexible 2.But try to avoid duplicate effort 3.Extend collaborations?

11. J Jensen CCLRC/RAL Questions What is the future of CERNs 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. 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…