iostat will give you disk-by-disk percent-busy over time; a commercial
product shows this graphically.

> -----Original Message-----
> From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU]On Behalf Of
> Robin Sharpe
> Sent: Thursday, August 30, 2001 11:36 AM
> To: ADSM-L AT VM.MARIST DOT EDU
> Subject: Re: TSM DB/Disk Pool - Disk tuning question
>
>
> 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
>
>
>
> "MMS <health-first.org>" made the following
>  annotations on 08/30/01 10:33:23
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