David,
In answer to 1), No, in my experience the activity in a disk pool gets
spread over all volumes, but not too evenly. In one of my disk pools,
which has 13 volumes, some are around 20% full, and some are up around 60%.
As for 2), good question. Q DB F=D does not show utilization of the
individual volumes. Maybe there's a SHOW command that does? Probably a
good idea to separate the volumes on different disks anyway.
Robin Sharpe
Berlex Laboratories
David Longo
<David.Longo@HEALTH-
FIRST.ORG> To: ADSM-L AT VM.MARIST DOT EDU
cc: (bcc: Robin Sharpe/WA/USR/SHG)
08/30/01 10:27 AM Subject:
Please respond to TSM DB/Disk Pool - Disk tuning
question
"ADSM: Dist Stor
Manager"
I have TSM Server 3.7.4.0 on AIX 4.3.3. I am going to be redoing my disk
storage for this machine and have basically two questions. if someone
knows the details of how this works.
1. The Disk Storage pool I have is 110GB. Most of the time it is between
20 and 70 percent full - mostly less than 50 percent. If I have this split
into say 10 volumes, each on a separate hard disk, does most of the
activity stay on the lower volumes and rarely on the higher ones?
Logically I see this as a coffee cup with a slow leak. The bottom is
almost always wet, the top rarely. Is my assumption correct?
Basically I would spread the volumes over the hard disks to even out disk
access.
2. Same basic question about TSM DB. It is 13GB and 65% utilized. I
imagine like a regular database it is spread out over the 13GB and has
more or less even access if spread out over several disks. Correct?
(With my current system the way everything is laid out now I can't use
things like "iostat" to prove/disprove this, and I didn't seem to find this
"specific" topic mentioned in manuals.)
Thanks,
David B. Longo
System Administrator
Health First, Inc.
3300 Fiske Blvd.
Rockledge, FL 32955-4305
PH 321.434.5536
Pager 321.634.8230
Fax: 321.434.5525
david.longo AT health-first DOT org
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