Re: [Qemu-devel] drive-mirror sync points

2013-05-13 Thread Wolfgang Richter
On May 13, 2013, at 5:46 PM, "Richard W.M. Jones" wrote: > On Mon, May 13, 2013 at 01:50:00PM -0400, Wolfgang Richter wrote: >> Paolo/anyone who knows - >> >> Are drive-mirror sync points (NBD flush commands) reflecting guest write >> barriers? Are guest write barriers respected by drive-mirror

Re: [Qemu-devel] drive-mirror sync points

2013-05-13 Thread Richard W.M. Jones
On Mon, May 13, 2013 at 10:46:55PM +0100, Richard W.M. Jones wrote: > On Mon, May 13, 2013 at 01:50:00PM -0400, Wolfgang Richter wrote: > > Paolo/anyone who knows - > > > > Are drive-mirror sync points (NBD flush commands) reflecting guest write > > barriers? Are guest write barriers respected by

Re: [Qemu-devel] drive-mirror sync points

2013-05-13 Thread Richard W.M. Jones
On Mon, May 13, 2013 at 01:50:00PM -0400, Wolfgang Richter wrote: > Paolo/anyone who knows - > > Are drive-mirror sync points (NBD flush commands) reflecting guest write > barriers? Are guest write barriers respected by drive-mirror? If so, that > would make drive-mirror much more palatable for

Re: [Qemu-devel] drive-mirror sync points

2013-05-13 Thread Paolo Bonzini
Il 13/05/2013 19:50, Wolfgang Richter ha scritto: > Paolo/anyone who knows - > > Are drive-mirror sync points (NBD flush commands) reflecting guest write > barriers? Are guest write barriers respected by drive-mirror? If so, > that would make drive-mirror much more palatable for disk introspecti