Re: [ceph-users] [Qemu-devel] qemu + rbd block driver with cache=writeback, is live migration safe ?

2014-04-22 Thread Kevin Wolf
Am 12.04.2014 um 17:01 hat Alexandre DERUMIER geschrieben: > Hello, > > I known that qemu live migration with disk with cache=writeback are not safe > with storage like nfs,iscsi... > > Is it also true with rbd ? First of all, in order to avoid misunderstandings, let's be clear that there are t

Re: [ceph-users] [Qemu-devel] qemu + rbd block driver with cache=writeback, is live migration safe ?

2014-04-22 Thread Kevin Wolf
ndation would be to add that bdrv_invalidate() implementation, then we can be sure for raw, and get the rest fixed as well. Kevin > >>>No, such a QMP command doesn't exist, though it would be possible to > >>>implement (for toggling cache.direct, that is; cache.w