From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU]On Behalf Of
Dirk Kastens
> Seemed to be a faulty raid controller. We always used raid5 for
> TSM volumes and never got any errors or bottlenecks. Of course,
> we use different raids for stgpools and the database.

A question: why are RAIDing your TSM diskpool? There's no need for
redundancy in the diskpool, since the diskpool is not the mission-critical
component of your backup system. It's the *tape* pool you need redundancy
for, and that's what a copy pool is for.

You *might* RAID 0 your diskpool, so that you stripe across the pool disks
for a larger number of read/write heads, but there's nothing but unnecessary
overhead when you RAID 5 it. The diskpool dies? You fix the pool, and you
back up the files again the next night.

--
Mark Stapleton (stapleton AT berbee DOT com)
Mark Stapleton (stapleton AT berbee DOT com)
Certified TSM consultant
Certified AIX system engineer
MCSE