Re: Oracle backups using Snapshot Technology

"until the split is sent to tape, there is no good backup because a disk failure in the primary backup storage can destroy the entire snapshot"

Maybe here is again terminology misuse... That statement above is, actually, irrelevant for split-mirror techniques. It's only relevant for snapshot technology.

On 11/9/06, Hameed, Amir <Amir.Hameed_at_xerox.com> wrote:
> We have been using EMC's BCV technology to backup our mission critical
> database for the past fours years and it has been working fine for us.
> The database size is over 1.2 TB. Once the establish is complete, the
> split is almost instantaneous and does not take more than a minute. As
> for the argument that "until the split is sent to tape, there is no good
> backup because a disk failure in the primary backup storage can destroy
> the entire snapshot". Even though this is true but there are ways to
> protect the online backup mirror by mirroring it with 1+0 or 0+1. It is
> certainly not a cheap solution but there is no guarantee that a tape
> will not go bad after the snapshot is copied to the tape.
> We have been operating our snapshot devices in "non-protective" mode all
> these years and we have had situations where a drive went bad after the
> snapshot was taken, but we use rotating BCVs where we always have two
> backups on-line, the most current one and the one taken a night before
> that and if the devices are configured properly, the chances of both
> mirrored copies going bad is low. The backups also go to take soon after
> the snapshot is taken.
>
> Amir

-- 
Best regards,
Alex Gorbachev

The Pythian Group
Sr. Oracle DBA

http://www.pythian.com/blogs/author/alex/
http://blog.oracloid.com
--
http://www.freelists.org/webpage/oracle-l