Re: [Qemu-devel] [ceph-users] rbd cache + libvirt

[Stefan Hajnoczi]

On Mon, Jun 08, 2015 at 07:49:15PM +0300, Andrey Korolyov wrote:
> On Mon, Jun 8, 2015 at 6:50 PM, Jason Dillaman <address@hidden> wrote:
> > Hmm ... looking at the latest version of QEMU, it appears that the RBD 
> > cache settings are changed prior to reading the configuration file instead 
> > of overriding the value after the configuration file has been read [1].  
> > Try specifying the path to a new configuration file via the 
> > "conf=/path/to/my/new/ceph.conf" QEMU parameter where the RBD cache is 
> > explicitly disabled  [2].
> >
> >
> > [1] 
> > http://git.qemu.org/?p=qemu.git;a=blob;f=block/rbd.c;h=fbe87e035b12aab2e96093922a83a3545738b68f;hb=HEAD#l478
> > [2] http://ceph.com/docs/master/rbd/qemu-rbd/#usage
> >
> 
> Actually the mentioned snippet presumes *expected* behavior with
> cache=xxx driving the overall cache behavior. Probably the pass itself
> (from cache=none to proper bitmask values in a backend properties) is
> broken in some way.
> 
> CCing qemu-devel for possible bug.

CCing Josh Durgin and Jeff Cody for block/rbd.c

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