Re: Why does MAXPR parameter not always produce multiple processes?

The only reason for this that I have run in to is that all of the data that
needs to be backed up is from one node.  TSM will not currently create
multiple processes for a single node's data, which is pretty inefficient.
The same goes for migration, which used to bite us alot.

On 10/5/06, Scott McCambly <mccambly AT allstream DOT net> wrote:


Is there any chance that the data is only coming from one client, or all
from one collocation group on the day that it only starts one process?

Schneider, John wrote:

>Greetings,
>       Are there some situations where a backup stgpool will
automatically
>override the MAXPR parameter you give it?  We have a few disk storage
pools
>that absorb several hundred GB a night, and our offsite scripts use a
>'backup stgpool tapepool drcopypool maxpr=3' to generate the offsite
copy.
>In some cases the backup stgpool will create 3 separate processes, but in
>some cases it will only create a single process.  Needless to say, the
time
>to complete the 'backup stgpool' really suffers when only one process
gets
>created.
>       In each case, the disk storage pools in question have 10-20 disk
>storage pool volumes to copy data from, and plenty of tape drives
available.
>The devclass mountlimit for the tape library is set to DRIVES, and we
also
>tried setting it to the number of drives (14), but that did not help.
>       The TSM instance that is seeing this symptom is a library client.
>Another TSM instance on another server is the library server.  I don't
know
>if an other TSM library client is seeing this symptom, but I don't think
so.
>
>       This is TSM 5.3.2.0, running under AIX 5.3LM1 in case that
matters.
>
>Best Regards,
>
>John D. Schneider
>Senior Systems Administrator - Storage
>Sisters of Mercy Health System
>3637 S. Geyer Rd.
>St. Louis, MO 63127
>Email: schnjd AT stlo.mercy DOT net
>Phone: 314-364-3150  Cell: 314-486-2359
>
>
>
>
>




--
Andy Carlson
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