Hello,
I've looked around Google and the zfs-discuss archives but have not been
able to find a good answer to this question (and the related questions
that follow it):
How well does ZFS handle unexpected power failures? (e.g. environmental
power failures, power supply dying, etc.)
Does it consistently gracefully recover?
Should having a UPS be considered a (strong) recommendation or a "don't
even think about running without it" item?
Are there any communications/interfacing caveats to be aware of when
choosing the UPS?
In this particular case, we're talking about a home file server running
OpenSolaris 2009.06. Actual environment power failures are generally <
1 per year. I know there are a few blog articles about this type of
application, but I don't recall seeing any (or any detailed) discussion
about power failures and UPSes as they relate to ZFS. I did see that
the ZFS Evil Tuning Guide says cache flushes are done every 5 seconds.
Here is one post that didn't get any replies about a year ago after
someone had a power failure, then UPS battery failure while copying data
to a ZFS pool:
http://lists.macosforge.org/pipermail/zfs-discuss/2008-July/000670.html
Both theoretical answers and real life experiences would be appreciated
as the former tells me where ZFS is needed while the later tells me
where it has been or is now.
Thanks,
-hk
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