On Mon, 12 Feb 2007, urgrue wrote:
If it's using block level replication, how does it offer instant recovery
on filesystem corruption? Does it track every block written to disk, and
can thus roll back to effectively what was on disk at a particular instant
in time, so you then just remount the filesystem and the replay of the
journal should restore to a good state?
Yes. I may be wrong but to my understanding at least NetApp has this
capability.
No, NetApp takes snapshots of the filesystems on a schedule (hourly, daily,
weekly, etc), and you can read files off of those snapshots. you cannot getany
more granular then that.
David Lang
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