ADSM-L

Re: What stripe size to use for TSM DB, LOG

2002-10-02 14:54:16
Subject: Re: What stripe size to use for TSM DB, LOG
From: Andrew Carlson <andyc AT ANDYC.CARENET DOT ORG>
To: ADSM-L AT VM.MARIST DOT EDU
Date: Wed, 2 Oct 2002 13:53:54 -0500
I played with this at one time, with 6 36GB SSA disks.  I found the
smallest stripe size (4K) worked the best.  I cut 50% of my DB backup
time going from 128K to 4k stripe size.  I saw little or no observable
difference for my client backups, but that machine has other resource
issues that may have masked the effect.


Andy Carlson                                    |\      _,,,---,,_
Senior Technical Specialist               ZZZzz /,`.-'`'    -.  ;-;;,_
BJC Health Care                                |,4-  ) )-,_. ,\ (  `'-'
St. Louis, Missouri                           '---''(_/--'  `-'\_)
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On Wed, 2 Oct 2002, Kilchenmann Timo wrote:

> Dear all,
>
> >From a previous threat I learned, that TSM fills a DB volume an than goes
> to the next one. Same is true for the LOG volumes - no "load balancing"
> like on STG Volumes via client sessions.
>
> In this case (DB & LOG) I plan to use AIX LVM to stripe the logical volumes
> over the available physical disks. The question here is what stripe size
> should I use? Any suggestions?
>
> Many thanks in advance!!!
>
> Timo
>

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