On Monday 11 July 2005 13:32, Russell Howe wrote:
> Jonte Norman wrote:
> > Hi Bacula-users,
> >
> > And what if I only have enabled VSS on one of the partitions (the one
> > holding the MSSQL or Exchange DB files) on my Windows machine, what
> > happens then?
> >
> > Also, does anyone know if he has implemented VSS restore yet? As I
> > understand this is a must have if one are going to do a proper restore
> > of an MS Exchange database...
>
> I'm not sure this would work for things like Exchange. You would need to
> tell it to do something like this:
>
> * Flush changes to its database files
> * Back up those files, without them changing in the process
> * Tell Exchange that it's free to write to the files again
This is exactly what VSS does, but the technical details are considerably more
complicated. It is all documented on Microsoft's web site.
>
> Anything else, and you will end up with an inconsistent Exchange
> database (even if VSS does something like 'snapshotting', unless all
> writes by Exchange to its database are transactional you will still end
> up with an unclean database backup and you'll have to become more
> familiar with eseutil than you would ever wish).
>
> Your best bet here is to use ntbackup to dump the Exchange database to a
> file and back that up, much like the system state backup described in
> the manual.
>
> You will of course need the space for this dump, but disk space is
> cheap. There's not usually any need to have RAID for scratch disks like
> this, etc.
>
> The same principle applies to MS SQL Server.
>
> It would be like backing up a live filesystem in Linux by dumping the
> block device directly. It will probably work, but you will have to fsck
> it, and there is *NO* guarantee that you won't lose data (in fact, it's
> very likely that you will).
--
Best regards,
Kern
(">
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