On Dienstag 03 Februar 2009 Christoph Hellwig wrote:
> Yeah, that sounds correct. Do you volunteer for the FAQ entry?
> xfs.org is a wiki so you could add it. I'm happy to proof-read it
> if you want.
I don't know if it's good and correct, I just put this in the wiki, and
additionally changed 2 sections, please check the wiki log if it's
== Q. What about the hard disk write cache? ==
The problem with hard disk write caches is that their contents are lost
in case of a power outage. With hard disk cache sizes of currently up to
32MB that can be a lot of valuable information.
With a single hard disk and barriers turned on (on=default), a powerfail
"only" looses data in the cache but at least does not destroy the
With a RAID controller with battery backed cache, you should turn off
barriers, as recommended above. But then you *must* disable the hard
disk write cache in order to ensure to keep the filesystem intact after
a power failure.
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