Well, since you have multi-threaded expiration in TSM v6 (basically 1 thread
per volume) expiration is alot faster.
That could be an easy way of handling your expiration problems, going to v6,
but if your databasevolumes are located on the same arrays, you'll still get
lousy performance, just spread over multiple thread instead of one ;)
Best Regards
Daniel
Daniel Sparrman
Exist i Stockholm AB
Växel: 08-754 98 00
Fax: 08-754 97 30
daniel.sparrman AT exist DOT se
http://www.existgruppen.se
Posthusgatan 1 761 30 NORRTÄLJE
-----"ADSM: Dist Stor Manager" <ADSM-L AT VM.MARIST DOT EDU> skrev: -----
Till: ADSM-L AT VM.MARIST DOT EDU
Från: "Lee, Gary"
Sänt av: "ADSM: Dist Stor Manager"
Datum: 02/16/2012 15:32
Ärende: Re: Expiration performance TSM 5.5 (request)
Do you have many win 2008 and win 7 clients with client version 6.2.2?
For some reason (forget the apar), expiration is very slow with these clients.
I am going to 6.3 soon, and hope to solve this with that move.
I have a 6.2 server, can't get your script to run, but observation tells me
that expirations that run hours on 5.5 run in minutes on 6.2.
Gary Lee
Senior System Programmer
Ball State University
phone: 765-285-1310
-----Original Message-----
From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU] On Behalf Of
Loon, EJ van - SPLXO
Sent: Thursday, February 16, 2012 9:02 AM
To: ADSM-L AT VM.MARIST DOT EDU
Subject: [ADSM-L] Expiration performance TSM 5.5 (request)
Hi TSM-ers!
I'm struggling with the performance of our expiration process. I can't
get it any faster than 100 object/second max. We tried everything, like
using more or less database volumes, multiple volumes per filesystem,
mirroring, unmirroring, but nothing seems to have any positive effect.
We are using SAN attached enterprise class storage (EMC Vmax) with the
fastest disks available.
I have seen other users with similar (or larger) databases with much
higher figures, like more than 1000 objects/sec, so there must be
something I can do to achieve this. In 2007 at the Oxford TSM Symposium
(http://tsm-symposium.oucs.ox.ac.uk/2007/papers/Dave%20Canan%20-%20Disk%
20Tuning%20and%20TSM.pdf page 25) IBM also stated that 1000 object/sec
is possible.
I would really like to know from other TSM 5.5 users how their
expiration is performing. Could you please let me know by sending me the
output from the following two SQL queries, along with the platform you
are using:
select activity, cast((end_time) as date) as "Date",
(examined/cast((end_time-start_time) seconds as decimal(18,13))*3600)
"Objects Examined/Hr" from summary where activity='EXPIRATION' and
days(end_time)-days(start_time)=0
select capacity_mb as "Capacity MB", pct_utilized as "Percentage in
use", cast(capacity_mb*pct_utilized/100 as integer) as "Used MB" from db
Thank you VERY much for your help in advance!!!!
Kind regards,
Eric van Loon
KLM Royal Dutch Airlines
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