How long does the migration to tape take after backup to disk?

Zlatko Krastev
IT Consultant




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Subject:        Performance again!!!

Hello everybody,

It seems like TSM performance problems will neer
end!!!

Here is the new problem:

The customer is running TSM 4.2.1.0 on a Windows 2000
server machine . An IBM rack case 82XX  which contains
a Quantum DLT8000 tape drive is connected to the
server.
The driver version for the Quantum DLT drive is 1.5
and
is installed on the W2K machine. We tried a backup of
350MB on the local server with the Windows 2000 Backup

utility and it took us approximately 75 seconds .

Next , we tried the same Backup from TSM using its
Device Driver and it took us about 9 minutes . We
tried switching TSM to use the Native device driver
but still we got the same performance result .

So we upgraded to 4.2.2 ; In the Device Manager for
TSM,we can see that TSMSCSI.exe is upgraded to
4.2.2.25 and the ADSMSCSI.sys is 4.2.2.3 .  The server
has a version of 4.2.2.25 .  Still , we obtained poor
backup performance .

We suspected that maybe it was a database bottleneck
( eventhough it is still empty) ; so we tried the same
Backup using TSM but the destination was on the
HardDisk.
The performance was good and the backup finished
within 75seconds .  So, we can eliminate the database
problem.
Also, we noticed with version 4.2.2.0 that it is
crashing frequently . It was exiting abnormally .

On the site of tivoli, the latest version of TSM
server is 4.2.2 . We do not have the 5.1 release .

does anyone have a suggestion?

thx a lot
Sandra

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