VSS and Snapshots/Clones log purging and mixing backup types

I would really appreciate if anyone could answer the following questions for 
me as we are looking into the use of iSCSI block storage and snapshot 
technology:

1. Is a snapshot capable of being rolled forward in the event of a DB 
failure/corruption to provide a no-loss restore in the event of DB corruption?
2. Can a snapshot be mounted into an RSG?
3. Can agent based conventional backups be mixed with VSS backups?
4. If snapshotting is used how are log files purged?
5. As snapshots are deltas are backed up clones required in order to protect 
from disk failures? The original data needs to be available to use a snapshot 
to roll back?
6. Exchange SP1 introduces Full, Differential and Incremental snapshots - 
does the backup application have to be modified to support this?

The thing I simply can't understand at the moment is that it appears that 
snapshots/clones are point in time - in which case reverting to them in the 
event of and Exchange DB problem always results in data loss?? I appreciate 
that it's a fast recovery and gives better RPO in the event of a lost log 
file drive (in which case conventional no-loss restore wouldn't be an option) 
but seems to be at the cost of RPO when experiencing DB problems.

Am I missing something??
-- 
Simon Green
0
s.green (1)
8/10/2005 4:10:04 PM
exchange.admin 57650 articles. 2 followers. Follow

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Are you proposing to use standard Microsoft components or use another 
vendor's software / hardware implementation to do backups? If the later I 
would ask the vendor a few questions.






"Simon Green" wrote:

> I would really appreciate if anyone could answer the following questions for 
> me as we are looking into the use of iSCSI block storage and snapshot 
> technology:
> 
> 1. Is a snapshot capable of being rolled forward in the event of a DB 
> failure/corruption to provide a no-loss restore in the event of DB corruption?
> 2. Can a snapshot be mounted into an RSG?
> 3. Can agent based conventional backups be mixed with VSS backups?
> 4. If snapshotting is used how are log files purged?
> 5. As snapshots are deltas are backed up clones required in order to protect 
> from disk failures? The original data needs to be available to use a snapshot 
> to roll back?
> 6. Exchange SP1 introduces Full, Differential and Incremental snapshots - 
> does the backup application have to be modified to support this?
> 
> The thing I simply can't understand at the moment is that it appears that 
> snapshots/clones are point in time - in which case reverting to them in the 
> event of and Exchange DB problem always results in data loss?? I appreciate 
> that it's a fast recovery and gives better RPO in the event of a lost log 
> file drive (in which case conventional no-loss restore wouldn't be an option) 
> but seems to be at the cost of RPO when experiencing DB problems.
> 
> Am I missing something??
> -- 
> Simon Green
0
8/11/2005 10:16:05 AM
Reply:

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