5. Trouble shooting
Q1. DAQ filesystems
are 100% full
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The data disks on the DAQ are managed by CDR. Once a file
is transferred, the CDR will run some cross checks to confirm that
there were no transfer errors and that the file has been migrated
to CASTOR. It will then purge the file from the local disk. Purging
is handled by the purger script and in general, the file
is not deleted immediately. If the local disks become full, this
can mean either:
The purger mechanism has been intentionally turned off
The purger mechanism is on but the CDR will not purge files
If
it is the former then the problem is easily fixed. If however the
CDR blocks the deletion of local files, the most probable reason
is that there has been an error in the transfer of the file to storage.
The local file purge is then blocked until the discrepancy has been
resolved. Users should under no circumstances start deleting files
from the local disks of their own accord. Doing so may result in
unrecoverable loss of data. cdr.support@cern.ch
should be contacted .
Q2. I get error mail
messages from Cron under the CDR account
In such a case cdr.support@cern.ch
should be contacted .
Q3. There is a problem
with the CDR service request form
In such a case cdr.support@cern.ch
should be contacted .
Q4
How do I know if the CDR is running on my DAQ
When CDR is running on the DAQ, the stage_watchdog
is executed every few minutes from crontab. The main CDR process
is call stage_control. The UNIX ps command can be
used to check for either of these processes.
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