Agenda for the storage group EVO Meeting 29th July 2008
	=======================================================

Present:
	Greig Cowan (chair and minutes)
	Brian Davies
	John Bland
	Matt Doidge
	Winnie Lacesso
	Ewan McMahon
	Elena Korolkova
	Peter Love

Apologies:
	Jens Jensen


0. Review of actions

See below.


1. Site round-up. What problems have you seen in the last week?

   - http://www.gridpp.ac.uk/wiki/GridPP_storage_availability_monitoring

Oxford: DPM draining 3 production pools onto other empty pools which
have the new back planes (replaced by Viglen). dpm-drain is incredibly
slow. 2TB of data has take almost 1 week to move from the 3 servers to
the 3 new servers. Once complete, Viglan will return to replace the
back planes on the remaining machines.

GC notes that we understand why dpm-drain is so slow:

1. rfio used to perform the transfer, so every transfer required the
GSI handshake.

2. connection to DB times out after some short length of time, meaning
that dpm-drain has to be constantly restarted. 

Once this work is complete, Oxford will have ~90TB usable storage.

Apart from this, no other sites had anything to report. There did not
appear to be any other major problems (other than the certificates,
see below).


2. Space tokens

BD will circulate details later today concerning the allocations that
ATLAS as expecting for the ATLASPRODDISK space token. They will be
doing this in units of 0.5TB. Size will be site dependent.

Thanks to all sites who have already enabled this. You will be able to
use dpm-updatespace to increase the size of the token. Remember to
specify the lifetime that you want when updating (since there is a bug
in dpm-updatespace).

ACTION: Brian to circulate space token details to sites.


3. Certificates

UCL-Central, UCL-HEP, Cambridge and Durham were all hit by the
certificate upgrade process last week. Sites need to remember that
when using DPM, the head node certificates have to be updated at
/etc/grid-security and copies (with correct names and permissions)
made at /etc/grid-security/dpmmgr. YAIM will do this for you.


4. DPM-xrootd 

GC reported on his ongoing investigations in using xroot to access
files on DPM. This is done with the production system at Edinburgh and
some of GC analysis jobs (therefore it applies to real-world
usage). Problem with support for >2GB files fixed. Have now stumbled
across what appears to be a memory leak in the xroot client
libraries. The same analysis job completes successfully when using
rfio to access files, but is killed off by the Edinburgh batch system
when using xroot for the data access. GC is in contact with the
developers to try and understand the root of the problem.


5. New version of DPM admin toolkit available

v1.2.0-4 now available in sys-man yum repository. This contains new
tool: dpm-listspaces from Michel Jouvin. Replacement for dpm-qryconf
and also can be used with --gip option to act as the new DPM
information provider. Will eventually move into the DPM release. Sites
should familiarise themselves with it's usage.

Sites have installed this and are using it.


6. AOB

BD reported problems at the Tier-1 due to CASTOR DB upgrade. FTS for
ATLAS not working. T2 sites will be seeing build up of files. This
came about as part of the move to using Oracle RAC as backend. LHCb
move went fine. Database for ATLAS much larger compared to LHCb. 

T2s should see the usage of ATLASMCDISK increasing. Soon ATLAS will
move over to ATLASPRODDISK.


========================================================================
ACTIONS

Actions (correct list this time):

237	17/10/2007	Test and stress test DPM on Lustre	Greig/Andrew	Low	Open
247	12/12/2007	Circulate "usable storage" for discussion	Jens	Med	Open
263	6/2/2008	Investigate publishing role acbrs for CASTOR	Jens	Low	Open
267	6/2/2008	Blog item about SRM2 (protocol) work	Jens	Med	Open
276	5/2/2008	Further benchmarking tests to compare performance of xfs	Andrew/Greig	Low	Open
	
277	16/7/2008	Peter to update wiki with Lancaster's success story

Closed.

278	16/7/2008	Circulate Andy Pickford's notes to mailing list (this was done)

Closed


NEW ACTION
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279	30/7/2008	Brian to circulate space token details to sites.	Open