Smaller storage pool volumes and more of them.  Then TSM only has to
open and use what it needs at the time, and more processes can be run
successfully at the same time.  Of course this all depends on how much
RAM and processor power you have as well.  The Single LUN shouldn't be a
problem as long as you have a good queue depth, but I would definitely
break up the pool into multiple volumes.


See Ya'
Howard Coles Jr.
John 3:16!

-----Original Message-----
From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU] On Behalf Of
Mehdi Salehi
Sent: Sunday, May 02, 2010 10:56 PM
To: ADSM-L AT VM.MARIST DOT EDU
Subject: Re: [ADSM-L] mediawait during backup to disk

- One point is that you gain virtually nothing by 6 volume groups. You
can
put the six LUNs in a single VG, no performance difference I believe.

- Have you tuned the queue_depth of the LUNs based on AMS documentation.
Check it by "lsattr -El hdiskX"

Here is my question from the group:
Which one performs better?
a- One big TSM volume on a 2TB LUN
b- More than one TSM volumes on a 2TB LUN

Thanks