Check the archives for the recent thread with subject "Limitation of
TSM DB Volumes" - stripes and mirrors are fine for the DB, so long
as you keep the number of DB volumes high enough.

Also, check out <http://msgs2.adsm.org/cgi-bin/get/adsm0303/285/1.html>
for my experience running RAID5 disk storage pool volumes, using
software
RAID5. It is possible, just have to be careful with stripe sizes.
Likewise,
you need to keep the number of volumes high enough to keep the disks
busy.

On Wednesday, Apr 16, 2003, at 05:02 Australia/Sydney, Adolph Kahan
wrote:

I would not recommend RAID 5 for the stgpools. While backing up data
TSM
will only be doing writes to the stgpools and with RAID 5 you pay a
performance penalty for each write.  I would just make this RAID 0.
I've
done some tests with various RAID adapters and in each case I found
that
RAID 0 for the stgpools, provided better backup throughput than the
RAID
5 implementation.

Adolph Kahnan
AK Consulting Inc.



-----Original Message-----
From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU] On Behalf
Of
Talafous, John G.
Sent: Tuesday, April 15, 2003 2:22 PM
To: ADSM-L AT VM.MARIST DOT EDU
Subject: FAStT700 RAID 0,1,3,5? for DB and Stgpools.

We're looking seriously at a FAStT700 attached to an AIX machine for
our
DB
and Stgpools.  At present, I am considering 36GB 15K RPM drives for DB
and
Log. I am considering 73GB RPM 15K drives for stgpools. (I am open
further
to suggestions on this!) My question is in regards to the RAID
configuration.  Since TSM likes to mirror DB and logs, would RAID-0 be
best
there? How about stgpools?  RAID-5?  Any experience in this area?

Any input would be appreciated and TIA,
John G. Talafous              IS Technical Principal
The Timken Company            Global Software Support
P.O. Box 6927                 Data Management
1835 Dueber Ave. S.W.         Phone: (330)-471-3390
Canton, Ohio USA  44706-0927  Fax  : (330)-471-4034
talafous AT timken DOT com           http://www.timken.com


**********************************************************************
This message and any attachments are intended for the
individual or entity named above. If you are not the intended
recipient, please do not forward, copy, print, use or disclose this
communication to others; also please notify the sender by
replying to this message, and then delete it from your system.

The Timken Company
**********************************************************************

--
Paul Ripke
Unix/OpenVMS/TSM/DBA
101 reasons why you can't find your Sysadmin:
68: It's 9AM. He/She is not working that late.
-- Koos van den Hout