Since you mentioned they were SCSI drives, is it possible you have a
cable quality / length / termination issue on your SCSI bus.  It might
only manifest itself under certain signalling conditions such as those
under heavy load by multiple targets.  Can you do a full tape-to-tape
copy outside of TSM without issue?

-Ken

-----Original Message-----
From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU] On Behalf Of
Mario Behring
Sent: Monday, August 03, 2009 2:35 PM
To: ADSM-L AT VM.MARIST DOT EDU
Subject: Backup Stgpool using 2 drives taking too long


Hi list,

The environment is TSM Server 5.5 running on a Windows 2003 box with a
IBM ULT3580-TD4 SCSI (2 drives) connected.

There is a backup stgpool process running on background for more than 12
hours (several schedules were missed during this time).

The process is using both drives, one reading the data and the other
writing, as expected. The problem is that, at some point, both drives
stay IDLE for more than 20 minutes...then start reading/writing again
(for a short time I might add).

The process would be long over by now if this was not happening...what
could be wrong and how can I put the drives to work non-stop, if
possible...??

Any process that uses both drives in this fashion, like an EXPORT for
example, is behaving the same way...

Thanks

Mario