> 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?
