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DPM status and plans

DPM status and plans. David Smith CERN, IT-DM-SGT Pre-GDB, Grid Storage Services 11 November 2008. Overview. DPM Current status Forthcoming release Plans Summary. DPM current status. DPM 1.6.11-3 is the last stable release on SLC4 (since 18 Aug)

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DPM status and plans

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  1. DPM status and plans David Smith CERN, IT-DM-SGT Pre-GDB, Grid Storage Services 11 November 2008

  2. Overview • DPM • Current status • Forthcoming release • Plans • Summary DPM status and plans - 2

  3. DPM current status • DPM 1.6.11-3 is the last stable release on SLC4 (since 18 Aug) • Issues are reported and handled viaGGUS, Savannah, support and user-forum mailing lists • DPM is used by about 187 sites in LCG • Current LCG statistics:https://twiki.cern.ch/twiki/bin/view/LCG/GSSDSRMv2DeploymentMonitoring DPM status and plans - 3

  4. DPM v1.7.0 The next release is expected to be v1.7.0 and is currently in certification. Changes include: • srmCopy has been fully implemented • Additions for the WLCG SRM MoU addendum: • write permission to a space can be limited to multiple groups • SRM2.2 srmReleaseFiles can be used without a requestToken • srmLs can return the list of spaces a given file is in • A new dpm-listspaces command line tool which also serves as a information provider has been added (a contribution from Michel Jouvin) • DPM retains space token when the admin drains a file from a filesystem (as a part of maintenance) DPM status and plans - 4

  5. DPM v1.7.0 • Added ADLER32 and CRC32 to the supported checksum types for the gridftp CKSM command • Server side checksum calculation of a file already in the DPM • New nameserver API calls to set or retrieve checksums • Added SURL cleanup after expiry or abort in some circumstances • Made some changes in preparation for SLC5 • Some more internal logging for space capacity updates • Version 1.7.0 will require an update of the dpm_db database schema • YAIM will do the update automatically. As usual a database backup beforehand is recommended. DPM status and plans - 5

  6. DPM information provider • Version 1.7.0 will use dpm-listspaces to provide more information about spaces • A gLite patch was also created to add dpm-listspaces to the current DPM 1.6.11-3 version • Entered certification before the DPM 1.7.0 release, may be available as a gLite update before the new DPM release • Updates glite-yaim-dpm, glite-info-dynamic-dpm, DPM-interfaces • Adds glite-info-provider-service • Will require YAIM to be rerun to setup the new providers but no changes in site-info.def needed DPM status and plans - 6

  7. DPM plans • A more friendly DPM python interface has been developed • Not yet released, decided to add to gLite as an entirely new package separate from the main DPM bundle For DPM the following are areas of interest • Enhance xrootd support • Pass xrootd client authentication details to the DPM for authorization decisions • Quota system • Further checksum support • Calculation on demand is already in gridftp2 DPM status and plans - 7

  8. DPM plans • Monitoring interface • To provide feedback on the state of the system • Tool for consistency check and repair • Both internal DPM structures and possible namespace verification by users • Enhance filesystem selection • Investigate a shared filesystem interface (e.g. NFS 4.1) • Input from the T1/T2 analysis working group will be used to decide direction • Resource limits • Service resource usage and disk server I/O limits • Compliance with the gLite logging recommendations • In particular logging via syslog for authentication events • Must also remain alert to the issues arising from sites and experiment requests DPM status and plans - 8

  9. Summary • New release of DPM is currently in certification • There may be an update of the information provider for the current DPM version beforehand • Have shown areas of interest for DPM development • But must balance with the requests and issues arising in the significant deployment base DPM status and plans - 9

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