Last modified 4 years ago Last modified on 02/09/16 15:05:10

dCache Tier I meeting MONTH DATE, 2013

[part of a series of meetings]

Present, IN2P3(), Sara(), Triumf(), BNL(), NDGF(), PIC(Marc), KIT(Samuel), Fermi(), CERN()


(see box on the other side)

Site reports


Marc reported that everything is more or less OK.

ATLAS staging requests

They are currently suffering from a problem with their tape system. ATLAS are currently reprocessing all data over a three year period, so triggering massive restaging activity: PIC currently has a queue of some 40,000 movers. Because PIC has only 8 drives, shared between ATLAS and CMS, staging these files is taking longer than the timeout period, so dCache is killing the stage requests. Unfortunately the enstore script has a bug where cancelling a stage request does not work, resulting in "background" activity beyond what dCache is controlling.

The Fermi guys said they have never seen this; however, since Fermilab have a 7 day timeout on staging requests, they never see this problem.

PIC has developed a patch to fix this problem. It isn't deployed yet.

The rest is OK.

Splitting SRM

Marc is preparing for a downtime towards the end of March. He is intending to split the SRM into separate endpoints: splitting the databases.

PosgreSQL v9.5

Marc also asked if there is any known problem with running PostgreSQL v9.5. Paul said no: there's even some optimisation available with 2.14, but unfortunately not 2.13.


Samuel reported that everything is running fine at KIT.


Samuel asked if there was any experience with running dCache on a PowerPC little endian machine. Paul replied that some time ago (at least 5 years) there was an unsuccessful attempt to deploy dCache on a PowerPC. This was unsuccessful because, at that time, dCache used JGlobus 1.8, which depended on an old TLS library that didn't work on IBM's JVM for PowerPC. This should not be a problem as 2.10 to 2.13 uses jGlobus 2.0 and 2.14 uses CaNL. Both these libraries use the JVM-supplied TLS implementation, which should be compatible with the JVM-supplied implementation.

NFS deletion logging

Samuel also asked about the current status of supporting NFS deletion notification in billing. Paul said this is in-progress. He couldn't give a firm estimate of when this would be available, but said he would bring it up during the developer's meeting.

Support tickets for discussion

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Same time, next week.