On Wed, Jan 23, 2019 at 04:56:24PM +0100, Ignazio Cassano wrote:
> Hello, I did not understand if you mean cinder snapshot pr netapp snapshot.
> Any case, why, we do not need to quiesce the instance ?
> Regards
> Ignazio
>

If being crash consistent is good enough for your needs, then you don't. I know
some do prefer the coordinated quiescing of IO in the instance to make sure any
in-flight transactions are flushed out and application data is more likely to
be in a good consistent state.

Depending on your application running in the instance, things like databases
are pretty good at rolling back incomplete transactions, so it's just a matter
of whether you can allow the possibility that something that was successful in
the milliseconds before the snap was created to now be rolled back when the
application restarts.