Re: Problems with migration from disk to tape storage pool
1999-08-23 10:59:57
Subject: |
Re: Problems with migration from disk to tape storage pool |
From: |
"Bernd Finger - Sun SAP Walldorf SAP Eng. Technical Solution Center" <Bernd.Finger AT GERMANY.SUN DOT COM> |
Date: |
Mon, 23 Aug 1999 16:59:57 +0200 |
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> From: John Schneider <jdschn AT ibm DOT net>
> Subject: Problems with migration from disk to tape storage pool
> To: ADSM-L AT VM.MARIST DOT EDU
>
> Greetings,
.
.
.
> So we set up a disk file pool of 3GB in size, and changed
> the backup copygroups to point to it. The disk file pool is
> set up to migrate data with a high and low point of 0%, and
> to migrate to the tape storage pool. My understanding was that
> when the clients started their backups they would write their data
> simultaneously to the disk storage pool, and immediately a
> migration would start which would grab a tape drive and
> copy data out of the disk storage pool onto the tape. Effectively
> a bunch of slow clients would now be writing their data through
> a disk pool to a single tape drive. The throughput of one client
> would not go up, but only one tape drive would be in use, instead
> of four or five being used for hours.
> But it is not working as expected.
.
.
.
Always set hi high enough to ensure all nodes can complete their backup to
disk. I
always had problems when the migration started during backup (this was under
AIX, but
I'm sure the behaviour is the same under other OSs).
I used to schedule a job to set hi to 0 to force migration after all client
data was
backuped to disk (e.g. at 05:00), and another job to set hi to 90 or after
migration
was completed (e.g. at 15:00).
Other experiences ?
Bernd
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- Problems with migration from disk to tape storage pool, John Schneider
- Re: Problems with migration from disk to tape storage pool,
Bernd Finger - Sun SAP Walldorf SAP Eng. Technical Solution Center <=
- Re: Problems with migration from disk to tape storage pool, Adam Slesinger
- Re: Problems with migration from disk to tape storage pool, Viswanathan, Ramesh (CNA)
- Re: Problems with migration from disk to tape storage pool, Kelly J. Lipp
- Problems with migration from disk to tape storage pool, Bob Brazner
- Problems with migration from disk to tape storage pool, Bob Brazner
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- Re: Problems with migration from disk to tape storage pool, Richard Sims
- Re: Problems with migration from disk to tape storage pool, Kelly J. Lipp
- Re: Problems with migration from disk to tape storage pool, Joel Fuhrman
- Re: Problems with migration from disk to tape storage pool, ADSM : Dist Stor Manager [mailto:ADSM-L
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