Hi experts,
we are testing lan-free DB2 (9.1) backups with TSM all on AIX (5.3).
For the offline backup and the restore we get pretty good numbers.
-> 1011GB/h parallel to 4 tape drives.
But if we start an online backup with the exact same configuration and the same DB2 backup parameters we get only the half of the performance. And after about 2/3 of the backup the performance is getting even worse with a very shaking throughput.
-> 600 GB/h parallel to 4 tape drives.
Likewise if we perform an online backup to /dev/null we get half the performance of a offline backup.
During the online backup no additional load is generated it is a test environment only.
Why is a online backup so much slower? Any idea?
Thanks & Regards
Edited by: Markus Wölfle on Feb 16, 2009 2:21 PM
Edited by: Markus Wölfle on Feb 16, 2009 2:22 PM