It is essentially performing a restore. If you're data for that node is
spread out, it will take a long time. I've tested backupsets from VTL
disk to real LTO volumes, and it went extremely fast. See how many
different tapes your node's data is spread out on.
Regards,
Shawn
________________________________________________
Shawn Drew
Internet
David.Longo AT HEALTH-FIRST DOT ORG
Sent by: ADSM-L AT VM.MARIST DOT EDU
07/22/2008 11:32 AM
Please respond to
ADSM-L AT VM.MARIST DOT EDU
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Subject
[ADSM-L] GENERATE BACKUPSET speed question
I have TSM server 5.4.3.0 with IBM 3584 Tape library with LTO drives.
I have never used Generate Backupset and decided to do some
testing to see how long it takes to create, for instance.
I am using LTO tape for the backupset, and using one entire
node, not individual filespaces and use toc=no.
In 2 days with several nodes, I have gotten basically nowhere.
In 6 hours it has "generated" just a couple of GB of data of
total requirement of about 50GB.
>From watching stats with "q process", it seems that one or both
of the following are happening:
A. It is scanning the entire TSM DB for what is needed, instead of
just that nodes data.
and/or
B. When it mounts an input tape, it is reading the entire tape instead
of just "seeking" to where the required data is.
I have no performance issues otherwise with tapes, TSM DB or
backups/restores.
Could someone shed some light on this slowness issue and how
to speed it up?
Thanks,
David Longo
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