Re: [Burp-users] split_vss=1 drawbacks

[Ghozlane T. <gt...@gm...>]

Whith the app specific backup you have a dump of clean data.
With vss writers you have a "crash" consistent backup .  Restore may need a
rerun of transactions, etc...

Depending on the usage and the app reaction to crashes, you may prefer the
app one..
 On Mar 3, 2015 10:24 PM, "Graham Keeling" <gr...@gr...> wrote:

> If the application has a 'VSS Writer', then the backup should have
> consistent application data.
> The VSS Writers are listed on the client side at the start of a Windows
> backup.
> I am not sure what the difference is between an 'app specific backup' and
> one that reads data from the application's VSS writer. Are they not the
> same thing?
>
> On Tue, March 3, 2015 8:27 pm, Ghozlane Toumi wrote:
> >>From my experience, sql and surely exchange plug in the shadow copy
> > infrastructure to quiece disk activity during the snapshot, you should
> > have
> > a "crash"  backup that is no worse than a real crash.
> > Sql and exchange should replay their log at the next restart.
> > Generally it's recommended however to use the app specific backup as
> > mentionned...
> >  On Mar 3, 2015 11:15 AM, "Jason Haar" <Jas...@tr...> wrote:
> >
> >> On 03/03/15 11:47, Graham Keeling wrote:
> >> >> Is it possible to recover hole server ?
> >> > It is possible to restore the whole server.
> >> > But it is your responsibility to test this.
> >>
> >> Database applications (like Exchange) don't write to disk on every
> >> change - and when they do it's via transaction logs first, then the
> >> formal write later. As such all best practice surrounding backups is to
> >> use application-specific backup tools: The only way to do a successful
> >> file system backup in these environments is to turn off the application
> >> first: ie force quiescence and then back that up. Snapshotting the file
> >> system first (while these apps are still running) doesn't help, as some
> >> of the data isn't written out yet
> >>
> >> So I wouldn't recommend burp or any other "file system" backup tool to
> >> backup Exchange or Microsoft SQL server. You might get lucky and have it
> >> work (corrupt database plus transactions logs sometimes equals
> >> successful restore), but you're doing it wrong if you do it that way
> >>
> >> Disclaimer: this is based on my very old exposure to Exchange in the
> >> past - but I can't see it being different today, especially with
> >> Microsoft's ongoing love affair with locking file operations
> >>
> >> --
> >> Cheers
> >>
> >> Jason Haar
> >> Corporate Information Security Manager, Trimble Navigation Ltd.
> >> Phone: +1 408 481 8171
> >> PGP Fingerprint: 7A2E 0407 C9A6 CAF6 2B9F 8422 C063 5EBB FE1D 66D1
> >>
> >>
> >>
> >>
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