> I also found that my write cache was set to WriteThrough instead of
> WriteBack, defeating the purpose of having a BBU and that my secondary
> server apparently doesn't have a BBU on it. :-(
Note also that several RAID controllers will periodically drop the
write-back mode during battery capacity tests. If you care about
consistently/deterministically having full performance (with
white-backed battery protected caching), you probably want to confirm
your controller behavior here.
(I've seen this on at least LSI based controllers in Dell 2950:s, and
also on some 3wares.)
--
/ Peter Schuller
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