On Wed, 2002-09-25 at 17:59, Greg Freemyer wrote:
> >> Anyone have an order of operation for something like this?
>
> >> I was thinking, that while oracle is in hot_backup mode, I would
> just be
> >> able to do xfs_dump /dev/sdb /dev/sdaa or some such thing, until
> all
> >> volumes are done.
>
> >> If I don't use xfs_freeze though, is that a good copy?
>
> >> I'm a bit confused at this point, and wanted to ask the
> community. TIA
>
> I thought Oracle's hot_backup was specifically designed to work with
> snapshots.
>
> I.e. freeze Oracle --> xfs_freeze --> create snapshot --> unfreeze
> xfs --> unfreeze Oracle
>
> If you are going to have it in that mode for the entire duration of
> your backup, you may have problems. In particular, I don't think the
> write buffers are all that huge.
So the operation described above can be done in a relatively short
period of time yes? If so, then xfs_freeze won't have to be on long as
the snapshot would appear as though it were still frozen.
> Even worse, if you go into hot_backup for an hour or so, and you have
> a machine crash during this time, your new data is lost!!!!
I assume you're speaking to the snapshot? I think this is the part that
confuses me the most.
> If you do want to try to go disk to disk extremely rapidly, you will
> need to either not use xfs_freeze, on mount your drive with -noatime.
We already mount with noatime, IOzone tests show it's much faster and
more consistent to do so. Disk-Disk backup would be ideal in our
situation, then it preserves the BCV like operation, which is really
what I'm trying to find out how to do, if I can, with XFS utilities.
> Greg Freemyer
> Internet Engineer
> Deployment and Integration Specialist
> Compaq ASE - Tru64 v4, v5
> Compaq Master ASE - SAN Architect
> The Norcross Group
www.NorcrossGroup.com
--
Austin Gonyou <austin@xxxxxxxxxxxxxxx>
Coremetrics, Inc.
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