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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