> We recently migrated from a locally attached 3590 E11 tape drive to two
> 3592 tape drives in a 3494 tape library.  We installed TSM 5.2.4.0 on a
> p5 570 lpar running AIX 5.3.  Our data is on an IBM ESS 800.  Every day
> we quiese the application and flash copy it then mount the flash copy
> volume groups to another system and backup.  We were just doing the
> native backup to the 3590 E11 locally attached drives.  Then we mounted
> the flash copy to the TSM server and did an archive.  The four volume
> groups comprise about 400G of data 95% being in CACHE.DAT files, one
> which is about 200G in size.
>
> The problem is the archive over fibre is taking 12-14 hours to complete.
> We were backing up to the 3590 local attached tape drives using native
> commands in about 8 hours.  The Aggregate data transfer rate:
> 10,793.34 KB/sec seems network speed and we are using fibre attached
> tape drives and ESS storage.  The data is mounted to the TSM server so
> the TSM server is also the client and the data should not be going over
> the network at all.
>
> We have looked at ESS 800 performance of LUNs, software compression,
> various settings including shmport and commMethod sharedmem and have not
> been able to come up with anything to make the backup run faster.  We
> have a pmr open at IBM but it has not produced any useful information
> that would resolve the problem.
>
> Has anyone else ever seen anything like this?

Did the recent tape drive migration end up with the TSM server using
the same HBA for both disk and tape?