Tests about prestaging

Objective of the activity

Testing the prestaging functionality of SRM in order to ensure that it can fulfill the requirements of the four LHC experiments. People involved in the activity: Andrea Sciaba, Flavia Donno, Elisa Lanciotti.

Meetings:

  • 9th Feb 09: Short meeting with Flavia about the presentation on SRM for the next WLCG Workshop of 21 March: minutes and comments
  • 11th Feb 09: Pre meeting in preparation of the phone conference of Feb 12th: minutes attached to this page (text file storagebusy_090211_minutes.txt).
  • Follow up of the 12th Feb meeting here

Reference implementation for prestaging

A reference implementation for prestaging using GFAL Python API has been developed and is being tested. More details here.

Some open issues:

Some open issues and bugs related to prestaging functionality of SRM. Some of them have been found using the the reference implementation for prestaging explained in the previous paragraph, so it can be useful to read more about it before going on with the open issues.

  • How to set the request life time for a call to srmBringOnLine through gfal api: see here
  • Exact definition of desiredTotalRequestTime here
  • TURL lifetime in CASTOR: this is a known issue (that is the life time of the turl in CASTOR is limited to the gridftp session), but then it came out that the failure of srmcp, which triggered the discussion, is not due to that, but to a checksum failure. A ticket has been opened to dCache, in order to avoid making the checksum with srmcp. See here for details.
  • CGSI-SOAP errors in all VOs: Savannah bug 107327
  • Possible change to an asynchronous srmLs in dCache: summary of a long mail thread
  • Will sites upgrade to Chimera?
  • Multiple SRM servers in the same dCache instance. Is it possible? Summary of a mail thread initiated by Gerard Bernabeu.
  • pin lifetime not returned by dCache server
  • Input and output arguments currently supported by GFAL Python API

From the experiments point of view:

Services interacting with SRM:

  • How FTS interacts with SRM: see here

Random notes

Interesting links:

  • CCRC08 wiki page with interesting discussions about Busy Storage Services and other SRM issues...

Interesting conferences:

-- ElisaLanciotti - 02 Feb 2009

Topic attachments
I Attachment History Action Size Date Who Comment
Texttxt storagebusy_090211_minutes.txt r1 manage 6.4 K 2009-02-23 - 15:02 UnknownUser Minutes of the meeting of Feb 11th 2009 about busy storage service.
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Topic revision: r20 - 2009-06-05 - AndreaSciaba
 
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