1. CERN IT Department CH-1211 Genève 23 Switzerland www.cern.ch/i t DPM status and plans David Smith CERN, IT-DM-SGT Pre-GDB, Grid Storage Services 11 November 2008

2. CERN IT Department CH-1211 Genève 23 Switzerland www.cern.ch/i t Internet Services Overview DPM –Current status –Forthcoming release –Plans Summary DPM status and plans - 2

3. CERN IT Department CH-1211 Genève 23 Switzerland www.cern.ch/i t Internet Services DPM current status DPM 1.6.11-3 is the last stable release on SLC4 (since 18 Aug) Issues are reported and handled via GGUS, 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. CERN IT Department CH-1211 Genève 23 Switzerland www.cern.ch/i t Internet Services 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. CERN IT Department CH-1211 Genève 23 Switzerland www.cern.ch/i t Internet Services 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. CERN IT Department CH-1211 Genève 23 Switzerland www.cern.ch/i t Internet Services 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. CERN IT Department CH-1211 Genève 23 Switzerland www.cern.ch/i t Internet Services 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. CERN IT Department CH-1211 Genève 23 Switzerland www.cern.ch/i t Internet Services 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. CERN IT Department CH-1211 Genève 23 Switzerland www.cern.ch/i t Internet Services 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