wiki:tier-one-meeting-20170523
Last modified 4 months ago Last modified on 05/23/17 14:56:01

dCache Tier I meeting May 23rd, 2017

[part of a series of meetings]

Present

dCache.org(Paul, Tigran), IN2P3(), Sara(), Triumf(), BNL(), NDGF(), PIC(Marc), KIT(Xavier), Fermi(), CERN()

Agenda

(see box on the other side)

Site reports

PIC

Everything is OK at PIC.

Multi restores for the same file

See RT Ticket #9150.

Marc reported that in The past months, VOs have started restoring many more files.

ATLAS has a new philosophy where they want to "directly read files from tape". This means they wish to restore multiple Terabytes in a few days.

They did some tests to see if sites could cope. During this testing, the increased load (apparently) results in this bug being triggered more often.

Tigran had asked if the problem, as first reported against dCache v2.13, was still happening with dCache v2.16. Yes, it is still happening.

pcells issue

Marc asked if the problem with pcells disconnecting after some time could be fixed.

It is not critical for them, but it is annoying.

NFS/Chimera schema migration

Chimera schema migration requires a PnfsManager upgrade before upgrading NFS door. This should be documented better.

Paul suggested that the release notes should reflect when there is a schema change to chimera.

NFS and space-manager

How does the NFS door interact with space reservations? Is it possible to write into a space reservation by placing the reservation's ID as a tag in the directory?

Yes, this should work, provided the NFS door is configured to use space-manager.

KIT

Nothing to report

SQL scripts

In the current version of the script, does it work?

Better without the final clean-up.

Tigran suggested removing the final two lines -- although this risks that the script leaves some orphaned tag inodes.

pinsv3 table

Patch for the next version -- not included in the version released last week?

No, it was not included in dCache v2.16.35.

It is included in the subsequent release (v2.16.36), which will be released shortly. The release is already tagged and built, so the RPMs may be downloaded already.

Support tickets for discussion

[Items are added here automagically]

DTNM

We will skip next week's meeting as it coincides with the dCache workshop.

The next meeting will be the same time on the following week: 2017-06-06.