Re: tape-to-tape performance
The storage pool backup that you are doing could be directly affected by the
database performance. Is this 1.6TB a lot of small files?
On the IO configuration side, how are your tape drives connected, SCSI or
FC? I suspect SCSI. If you have more than 2 drives, on a SCSI adapter that
is the problem. If they are E-model they really should be 2 per adapter to
get descent performance.
On a FC scenario you can go up to 4 drives per FC adapter and have very good
performance. I have gone has high as 8 per FC adapter, but performance does
If you are using FC, make sure your FC tape and disk are not on the same
adapters on a TSM server. Other applications it is fine, but not this one.
If your TSM database is on slow disk that will slow down the copies. It has
to create a lot of updates to the database to copy the storage pools.
Paul D. Seay, Jr.
From: Conko, Steven [mailto:sconko AT ADT DOT COM]
Sent: Wednesday, November 20, 2002 2:26 PM
To: ADSM-L AT VM.MARIST DOT EDU
Subject: tape-to-tape performance
we run a 3494 tape library with 3590 tape drives. after our backup are
finished, we run a backup stgpool to a copy pool on about 1.6TB of data. as
you can imagine, even with 8 drives this takes some time. are there any
server, device or other parameters we can tune to improve the tape-to-tape