Re: [Xen-users] GPLPV and LUN's on a storage

[Pasi Kärkkäinen <pasik@xxxxxx>]

On Tue, Oct 27, 2009 at 10:38:15AM +0100, Klaus Steinberger wrote:
> Pasi Kärkkäinen schrieb:
> >On Tue, Oct 27, 2009 at 07:35:22AM +0100, Klaus Steinberger wrote:
> >>>Do you use phy:, file: or tap:aio: ? 
> >>phy:
> >>
> >
> >Ok. Hmm.. that should be safe.
> >
> >The pygrub problem is most probably different issue, since with pygrub
> >you have two different programs accessing the same storage: domU with
> >for example phy: driver, and then the dom0 userspace pygrub using normal
> >non-direct calls, which causes the problem.
> >
> >Redhat fixed pygrub by making pygrub use O_DIRECT to bypass dom0 kernel
> >caches.
> >
> >What's your dom0 OS/kernel/Xen? RHEL5.4?
> 
> Scientific Linux 5.3  (same as RHEL 5.3) kernel-2.6.18-128.7.1
> 

Ok. Try updating to 5.4 and see if it helps..

What version of GPLPV?

Maybe James has some thoughts about this.. is it possible that Qemu IDE
devices use cached information from dom0 kernel cache and GPLPV direct
IO?

James: If you didn't read the original email, Klaus has problems after
Windows update+reboot.. corrupted data.

-- Pasi


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