1. ATLAS activities in the IT cloud in April 2008
Simone Campana

2. Data Distribution test
There has been a 1 week delay on the schedule
Week March 31st to April 6th : T1-T1 tests
Small interest for CNAF (other T1s being tested)
Week April 7th to April 13th : Functional Test
Data distribution from T0 to T1s at nominal rate
56000 seconds/day of data taking, data distributed over 24h
~600 MB/s out of CERN, 1/3 to tape, 2/3 to disk
CNAF share is 5% of RAW, 10% ESD, all AOD.
~10MB/s into tape, 40 MB/s into disk
All data must arrive at T1s within 3 days

3. Data Distribution Tests
Week April 21st to April 27th : T1-T1 tests
CNAF under test, quite some involvement is needed
Subscribe datasets from other T1 to CNAF
Monitor subscriptions and FTS server (actively)
Week April 28th to may 4th : Throughput test
Run T0 exports at 200% of nominal peak rate
~2GB out from CERN
CNAF target ~ 30MB/s to tape, 130 MB/s to disk

4. Reprocessing Deadline for reprocessing of M5 data was April 2nd
Basically missed by every cloud (CNAF had downtime)
Need to conclude reprocessing of M5 in 2 weeks
Deadline for reprocessing of FDR data is end of April
M5 data reprocessing tested successfully
See Claudia presentation
Deadlines have little importance… need to understand pre-staging limitation in
Need a full discussion with CNAF data management experts about this.

5. MC Production Stopped in IT since a couple of months
Disk Space crisis
The disk space which matters is
T2 storage is a cache
Need to restart at both T1 and T2s
15TB of space free (were used for CCRC08 and then cleaned)
~200MB/job to be kept on disk, would mean 75K jobs in IT
But you need to keep some space (?TB) for AODs from other clouds
Disk space crisis …
+ WMS pilot factory will be used
Quite some load on and