ADSM-L

[ADSM-L] IO profile of TSM storage

2012-06-29 03:00:58
Subject: [ADSM-L] IO profile of TSM storage
From: Grant Street <grants AT AL.COM DOT AU>
To: ADSM-L AT VM.MARIST DOT EDU
Date: Fri, 29 Jun 2012 16:55:15 +1000
Hi

I'm in the process of revisiting the TSM storage IO requirements and
thought I'd just get a heads up for any previous experience, corrections
etc.

From what I can gather in the documentation

* File based storage pools are read/written in 256KB chunks
* DB is read and written in 64KB chunks.

But....
what is the profile of active logs? archive logs?
Is there a way to increase the IO depth/concurrency when TSM
reads/writes to the storage pool etc

Does MOVESIZETHRESH and TXNBYTELIMIT offer much improvement?

Is there any way to determine if the DB/DB logs are slowing the
streaming from the Disk pools?

Do you know what the equiv "fio" would be to generate the same load
pattern as TSM. Using fio I was able to push a LUN to 300MB/s sequential
read but with TSM I'm getting about 60-70MB/s for a migration from file
to an LTO5 drive. Disk is not contended CPU is fine....any tips?

Grant

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