From: urgrue (no email)
Date: Mon Feb 12 2007 - 16:55:13 EST
> 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.
>
> With file based replication, about your only way of failure is the
> replication software going crazy blowing both sides away somehow,
> which given that the protocol is strictly designed to be one way,
> seems extremely unlikely that anything will happen to the master side.
I agree of course about avoiding SPOFs, but I do like a multi-tiered
approach, I mean multiple lines of defense. I use SAN for its speed,
reliability, and ease of administration, but naturally I replicate
everything on the SAN and have "true" backups as well.
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