ADSM-L

Re: NT TSM Performance dying by 30% a day!!

2001-10-18 12:08:14
Subject: Re: NT TSM Performance dying by 30% a day!!
From: "Prather, Wanda" <Wanda.Prather AT JHUAPL DOT EDU>
Date: Thu, 18 Oct 2001 12:05:30 -0400
I would first try to see if it's TSM or the host or the network.

1.  Take a large file, at least 100 MB, preferably more,  of non-blank data,
doesn't matter what.
     Make sure client compression is turned OFF.
    Do a selective backup of it 5 or 6 times, time it with a watch, see if
you can get consistent times.

2.  Now take the same file and FTP it to your TSM server host, also 5 or six
times.

TSM can't ever be quite as fast as FTP, but for a single file, it shouldn't
be more than about 10% slower.

If you get the same slow times with FTP and TSM, the problem is either the
network or the host, not with the TSM server software.

 - Have your network guys check for errors/retries on the port or switch;
having the network card set differently on the host and the switch can cause
slowdowns similar to what you describe.  No errors show up on NT, just on
the network ....

If FTP is as fast as it should be and only TSM is slow, the problem is in
TSM:

run Q DB F=D, see if  your DB cache hit ratio is at least 98%
Check the host, is all the memory on line or have you lost some?

Hope that gives you some ideas that help..

************************************************************************
Wanda Prather
The Johns Hopkins Applied Physics Lab
443-778-8769
wanda_prather AT jhuapl DOT edu

"Intelligence has much less practical application than you'd think" -
Scott Adams/Dilbert
************************************************************************






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