What's the layout of the db volumes?  ie. how many dbvol's do you have, and how 
many arrays/spindles/controllers are they spread out across?  The other thing I 
forgot to ask before was what OS the tsm server is on.  Another thing to look 
at is what your db cache-hit percentage is.  Could be there's a lot of disk 
contention due to insufficient db buffering.

 
Troy Frank
Network Services
University of Wisconsin Medical Foundation
608.829.5384

>>> matthew.glanville AT KODAK DOT COM 10/24/2005 2:58 PM >>>

> There's also performance internal to the tsm server to consider.
> The large server backups could be monopolizing your network
> throughput, scsi card throughput, pci/pci-x bus throughput, or some
> combination of all the above.
>

System performance monitoring shows hardly any network I/O during this
situation.
After all there is incremental backups running, it's not backing up much.
On the restorations, it was 10,000 files for 8 GB.  again not much.

One issue I have seen is high i/o wait on the TSM database volume, which
is why I know I have a database I/O issue, but, cancelling the larger
backups should not cause the restoration to suddenly jump from sending a
few hundred mb per hour to a gig every 5 minutes.  Which is why I think
it's an internal TSM issue and not a hardware performance issue.  But
maybe it is. I Just need more input into what to look for.

Matt Glanville



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