"smadar" <smadar@discussions.microsoft.com> wrote in message
news:4BB152CC-4455-4CDF-91D2-B39EEF2D1D6D@microsoft.com...
> Hi,
>
> I'm using MSCS registry checkpointing to make sure my application data
> written in registry will be available to other nodes when they become
> online.
> I was wondering if the checkpoint operation is synchronous to the registry
> write or is it possible that the registry write would be acknowledged but
> the
> checkpoint would be delayed?
> If the second option is possible than how can I guarentee that if a power
> failure occurs right after the registry write was acknowledged that the
> checkpoint was indeed written to quorum and would be available for the
> second
> node when it becomes online?

"Mike Epprecht (SQL MVP)" wrote:

> Hi
>
> Well, if your SAN and servers are not on UPS, and you have a power failure,
> the OS might be in the middle of a write, resulting in a partial write. This
> may lead to corruption in the registry or quorum drive.
>
> If you have a cluster for high availability, you should have a reliable
> power system, or at least a way to shut it down in an orderly fashion once
> the UPS goes onto low power.
>
> Unless you have an orderly server shutdown, don't expect anything to be 100%
> once it comes up.
>
> Why are you using the registry to persist data? Databases or XML files do
> the job better.
>
> Regards
> --------------------------------
> Mike Epprecht, Microsoft SQL Server MVP
> Zurich, Switzerland
>
> IM: mike@epprecht.net
>
> MVP Program: http://www.microsoft.com/mvp
>
> Blog: http://www.msmvps.com/epprecht/
>
> "smadar" <smadar@discussions.microsoft.com> wrote in message
> news:4BB152CC-4455-4CDF-91D2-B39EEF2D1D6D@microsoft.com...
> > Hi,
> >
> > I'm using MSCS registry checkpointing to make sure my application data
> > written in registry will be available to other nodes when they become
> > online.
> > I was wondering if the checkpoint operation is synchronous to the registry
> > write or is it possible that the registry write would be acknowledged but
> > the
> > checkpoint would be delayed?
> > If the second option is possible than how can I guarentee that if a power
> > failure occurs right after the registry write was acknowledged that the
> > checkpoint was indeed written to quorum and would be available for the
> > second
> > node when it becomes online?
>
>