Andy - what kind of clients do you have?  I've had problems with Windows 
clients all trying to do systemobject backups simultaneously and had to 
reorganize my nightly work to split out the systemobject backups from the 
regular files and then to serialize them because of contention problems with 
the TSM database.  It's supposed to be better in 5.2 but I'm not there yet.

Also, you may be right about the directory trees; if your stalls seem to happen 
at the beginning of the backups you can look at the cpu being used by the TSM 
BA client process and see if it's churning away.  If so, that may be what's 
happening.

Andy Carlson <andyc AT ANDYC.CARENET DOT ORG> wrote:
We are having terrible performance with one of our instances of TSM. I
have suspicions, but I want to hear what you guys say. Here is what we
have:

2 instances of TSM - TSMI and TSMU (TSMI is the problem)

TSM 5.2.1.1
AIX 51.ML4
RS/6000 P670 - 8 processors, 16GB memory
Fastt700 SAN
STK9840 Tape drives

The Database is 85% of 88GB (with room to expand another 50GB or so).

Right at this moment, we have 233 sessions with TSMI. The backup
sessions grind to a halt for hours at a time, with nothing apparently
happening. I suspect that the directory trees are being downloaded and
built, but not sure

When we split TSMI and TSMU, we created the TSMU instance, and did a
full backup on all the servers that moved there. The TSMI database is a
restored copy of the original database, with the TSMU stuff deleted out.

Any ideas would be greatly appreciated.


Andy Carlson |\ _,,,---,,_
Senior Technical Specialist ZZZzz /,`.-'`' -. ;-;;,_
BJC Health Care |,4- ) )-,_. ,\ ( `'-'
St. Louis, Missouri '---''(_/--' `-'\_)
Cat Pics: http://andyc.dyndns.org/animal.html

Joe Howell
Shelter Insurance Companies
Columbia, MO

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