--- Comment #10 from Carlos E. R. M. <carlos.e.r@xxxxxxxxxxxx> 2010-01-15
18:36:55 CST ---
(In reply to comment #9)
> > Er... excuse the question, what is "volatile write caches"?
> write caches that lose your data when they lose power.
> Consumer hard drives usually have 8-16-32MB write caches; if the drive loses
> power, the cached data evaporates and never hits the disk - but the disk
> already told xfs that the data was safe, and xfs has moved on. This violation
> of trust between fs and disk can cause filesytem corruption :)
Ah, I understand. I had heard of that, but not of the name.
> Options are to get a ups, or turn off write caches. Or to find out why you're
> losing those IOs, and keep using barriers.
Mmm. I have an ups, but not yet on this machine. It is in the to-do list. The
data should be safe after a clean umount, but you are right, it is an issue.
The real solution would be for the chaps at Suse/Novell/openSUSE to find out
what is wrong with DM. I have passed this info to them. I'll keep hoping.
My current solution is to use reiserfs instead, for encrypted data at least
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