dCache Tier I meeting March 14, 2017

[part of a series of meetings]

Present

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

Agenda

(see box on the other side)

Site reports

KIT

dCache is running just fine for the last month.

SQL scripts

Paul to remind Tigran when he's back from NFS meeting.

pools repo 600 TiB

PIC has 380 TiB pools (with 3.3x10^{6 files), with XFS.}

Need to tune the je properties (for the BerkeleyDB) to boost the startup time. These used to need 4 hours; now less than 30 minutes. Also "btree memory for java" Java max heap size to keep btree

NDGF's largest pools are 100 TiB.

Modern dCache pools for start-up is much less ~10.

Paul pointed out that these are tunable via the pool.plugins.meta.db! properties

Marc shared PIC notes on this topic:

​http://pwiki.pic.es/index.php/DCACHE_CHECK_POOL_METADATA

plugin

Paul advised on how to do logging.

Tape migration

RT 9147

Paul to chase up Tigran about this information.

NDGF

Quite nice.

Updated to 3.0.10 last week, directly after released.

All the problems with the ZooKeeper? are fixed: no extra errors now.

We haven't been able to reboot

pool startup found problems

Seems that v3.0.10 better at scanning files files that have been uploaded in December with zero byte size.

370,000 zero-byte files uploaded by Alice. They have messed up when uploading from Japan.

PIC

Upgrade to 2.16. One issue

Upgrade problems

RT 9153

pinv3 table was unable to drop it.

Four tickets in the last two week.

RT 9150 multiple restore requests

Support tickets for discussion

[Items are added here automagically]

DTNM

Proposed: same time, next week.