Hi Eric,

What's holding you back from upgrading to version 6?

Maybe the upgrade will take as long as unloading/loading but you're in a
better position than staying on 5.5.

Groetjes,
Oscar
Butterfly Software Limited

-----Original Message-----
From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU] On Behalf Of
Loon, EJ van - SPLXO
Sent: 27 June 2012 14:23
To: ADSM-L AT VM.MARIST DOT EDU
Subject: [ADSM-L] DBUnload, need for speed

Hi TSM-ers!
My TSM databases are running for quite a while (since 4.1) and they are
becoming rather fragmented, one of them more that 25%! It becomes
noticeable too, expiration is running longer and longer.
Our TSM servers are all running in AIX 5.3 on a P-series 570, SAN attached
to a VMAX (OS, DB and LOG) and VNX (diskpool) storage subsystem and two
EMC DL4106 DiskLibraries (VTS without physical tapes).
Unloading the smallest (95 Gb) database takes about 7 hours, loading it
takes about 3.5 hours. These tests are perform with a live database copy
on our test environment. Overall it takes too long to do this on our live
environment.
I tried several scenarios: multiple filesystems, RAW lv's, cio/dio mounted
filesystems, multiple database volumes on multiple filesystems, everything
you can think of, but there's only a small gain in using multiple volumes
on dio mounted filesystems, the rest is marginal or even worse.
The first part of the unload is running very fast (4 or even 5 million
entries per minute, but at a given point performance drops dramatically.
It's always at the same point (around 80%), so my guess is that that's the
most heavily fragmented part.
The only thing I can think of to speed up the process is to use a storage
device with a very low latency, like SSD, but unfortunately that's not
supported on the P5 series...
Does anybody have some additional tips I can try?
Thanks for your reply in advance!
Kind regards,
Eric van Loon
KLM Royal Dutch Airlines
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