Re: [libvirt] [PATCH] set cache=off on -disk line in qemu driver if <shareable/> (but not <readonly/>) is set.
Daniel Veillard wrote:
On Sat, Nov 01, 2008 at 06:20:27PM -0500, Charles Duffy wrote:
> As cache=off is necessary for clustering filesystems such as GFS (and
> such is the point of shareable, yes?), I believe this is correct
> behavior.
>
> Comments?
>
Yes that sounds right, if shared over network we should not cache
locally in the OS,
applied and commited,
thanks !
Daniel
cache=off should be the default case (or the similar O_DSYNC case).
cache=on should only be used for temporal usage and not really
production data.
It's just unsafe to use caching if you data is important to you.
It's a hot issue in the qemu mailing list.
Cheers,
Dor
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