wiki:developers-meeting-20101116
Last modified 10 years ago Last modified on 11/16/10 16:53:08

dCache Tier I meeting November 16, 2010

[part of a series of meetings]

Present

dCache.org(Tigran,Owen,Tanja,Antje,Paul), IN2P3(), Sara(), Triumf(Simon), BNL(), NDGF(), PIC(Gerard), GridKa(Doris), Fermi(), CERN()

Agenda

(see box on the other side)

Site reports

KIT

So far, so good.

Bit of a problem with our head node. Back-log in

Options for "Pending" "total" and "expired".

Queue of several such parameters;

Staging of the pool.

parameter "Queue define class". Specify

pending total expired

define the amount of items in these

If you have several parameters and different storage classes. In what order are the storage classes selected?

It's first match. If you have enough files then it is triggered. If the size of the files then it's triggered.

It starts all storage-classes at the same time.

PIC

Things are OK at PIC.

ulimit issues

Just one issue: a pool went offline because it exceeded the ulimit maximum number of open files? Max of 1k files opened at the same time.

Gerard says he put the ulimit settings in the limits.conf and rc.local files. Is this sufficient?

DESY put the ulimit value somewhere; perhaps in /etc/default/security. They have a ulimit of 32k open file descriptors on the Solaris pools.

There's no explicit setting in dCache for setting the ulimit prior to starting dCache.

However, there are two useful settings in dCacheSetup (or dcache.conf post 1.9.6) that may be helpful. The 'dcache.local.shell' option names a file to be sourced. The 'dcache.local.run.sh' option names a file that will be executed. These files should be inside the /opt/d-cache/bin directory.

The most dangerous is FTP with multiple streams. For 10 streams, you need 11 or 12 (depending on whether the door relays the data). But, there is also other sockets that are always needed (e.g., cells communication, database connections, etc).

Webdav door

Probably release end of next week a new 1.9.10.

Is this for pre-production system? Yes.

Unix sockets

If you do lsof from Java process on pool do you see a lot of Unix domain sockets open?

Currently we have 1 socket open.

Triumf

OK.

Noticed there were some failed transfers. From some sites .. time-outs. Changed the timeout in FTS to fix this.

Support tickets for discussion

[Items are added here automagically]

DTNM

Same time, next week.