ADSM-L

Re: ADSM on SP2 backing up large DB2 database on mutiple nodes

1998-03-03 12:02:53
Subject: Re: ADSM on SP2 backing up large DB2 database on mutiple nodes
From: Ray Pratts <pratts AT IBM DOT NET>
Date: Tue, 3 Mar 1998 11:02:53 -0600
Tom,

How do you get concurrent sessions to run?  I have tried to do this and
the second session waits until the first is complete, even when a second
tape drive is available.

Kauffman, Tom wrote:
>
> We're running Oracle, not DB2 - but 'large' is 'large', and our results
> might help.
>
> Our production database is running at 90 GB and takes about two hours to
> back up, using three concurrent sessions to three tape units. We run
> this direct to tape, and not through a disk pool. In addition, our test
> environment DB is also 90 GB; this backup runs about five hours, running
> two sessions to tape (this one uses 100 Mbit ethernet, not the SP
> switch).
>
> My ADSM server is a wide node (old style - 77 MHz); we've got two
> Quantum DLT-7000 tape units on each of two SCSI boards. So far, we've
> been able to run all four drives at full rated speed with this hookup,
> and are planning one more SCSI board and two more tape units for later
> this year. Any further expansion will require us to use a second server,
> or, more likely, to go to a high node for more I/O slots.
>
> Tom Kauffman
> Sr. Technical Advisor
> NIBCO, Inc.
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