I have some large servers that have their data bound to a management class
which directs the data directly to a primary tape pool.  This pool has a
copystgpool defined.  Therefore, when these clients backup at night, their
data is simultaneously written to the onsite and offsite tape copy.

My library is a 3584 with 12 LTO1 drives.

Everything has been working just great for many months, but on Monday I
upgraded the version and the OS on my TSM server.  I went from 5.1.6.2 to
5.1.7.3 and from AIX 4.3.3ML9 to AIX 5.1.0ML3.

All clients are running the 5.1.5 AIX TSM client.  They have been for many
months.

Since the upgrade, I have started getting the "ANS1312E Server Media Mount
Not Possible".

The RESOURCEUTILIZATION parameter was set to 4 on a few of the clients, but
was not set on others.
The MAXNUMMP for all the clients was set at the default of 2.

As I mentioned, it worked just fine this way before the server upgrade.

This morning, I read some other emails of people with a similar problem and
one said to raise the MAXNUMMP to 4.

I did this, and it started working again.

Could someone please explain to me why I needed to do this?  Each client is
still only mounting two tapes (one for onsite and one for offsite).

Was it broken before and now it's fixed, or vice-versa?

Thanks!

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