ADSM-L

Re: [ADSM-L] Lousy performance on new 6.2.1.1 server with SAN/FILEDEVCLASS storage

2010-10-20 16:31:05
Subject: Re: [ADSM-L] Lousy performance on new 6.2.1.1 server with SAN/FILEDEVCLASS storage
From: robert_clark <robert_clark AT MAC DOT COM>
To: ADSM-L AT VM.MARIST DOT EDU
Date: Wed, 20 Oct 2010 20:28:49 +0000
I like to divide the disk storage pool space into at least two file systems, on 
at least two volume groups.

This provides a few benefits:

First, you can set the two file systems up with different configs, and compare 
the performance of the two in production.

Second, if it comes time to get your disk storage pool LUNs replaced, you can 
remove storage pool volumes, give up the first set, get new LUNs, create new 
fileystems, etc (Repeat for second file system.)

Third, you can run dsmfmt in parallel, with one running per file system.

[RC]

On Oct 20, 2010, at 11:02 AM, Zoltan Forray/AC/VCU <zforray AT VCU DOT EDU> 
wrote:

Thanks for the affirmation. This is what I have been seeing/experiencing. As soon as I can empty the stgpool (5TB), I will define fixed volumes and see how much difference that makes. I am aware of the issue of single-threading the define/formats to not fragment them, however I wonder how much that really matters in a SAN?
Zoltan Forray
TSM Software & Hardware Administrator
Virginia Commonwealth University
UCC/Office of Technology Services
zforray AT vcu DOT edu - 804-828-4807
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From:
Markus Engelhard <markus.engelhard AT BUNDESBANK DOT DE>
To:
ADSM-L AT VM.MARIST DOT EDU
Date:
10/20/2010 09:20 AM
Subject:
[ADSM-L] Lousy performance on new 6.2.1.1 server with SAN/FILEDEVCLASS storage
Sent by:
"ADSM: Dist Stor Manager" <ADSM-L AT VM.MARIST DOT EDU>



Hi Zoltan,

my experience has been: use fixed size preformatted volumes, and be sure to
format them sequentially, even if it seems to take a hell of a time. But
then, it´s a one-time action and highly automated, so just don´t try to
boost "performance" here. Make sure no one else is bogging perfs, SAN guys
sometimes tend to put all kinds of unassorted loads on one storage array
producing massive hot-spots during TSM activities.

Kind regards,

Markus


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