Andi Kleen wrote:
On Mon, Apr 21, 2008 at 12:42:42AM +0100, Jamie Lokier wrote:
Andi Kleen wrote:
[LVM] always disables barriers if you don't apply a so far unmerged
patch that enables them in some special circumstances (only single
backing device)
(I continue to be surprised at the un-safety of Linux fsync)
Note barrier less does not necessarily always mean unsafe fsync,
it just often means that.
Also surprisingly lot more syncs or write cache off tend to lower the MTBF
of your disk significantly, so "unsafer" fsync might actually be more safe
for your unbackuped data.
Hi Andi,
Where did you get this data?
I have never heard that using more barrier operations lowers the reliability or
the MTBF of a drive and I look at a fairly huge population when doing this ;-)
ric
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