On 06/30/2012 05:42 PM, Vladimir Bashkirtsev wrote:
Dear all, Currently I testing KVMs running on ceph and particularly testing recent cache feature. Performance is of course vastly improved but still have occasional KVM hold ups - not sure who is at blame ceph of KVM. But I will deal with it later. Right now I've got myself a question which I could not get answered myself: if I do live migration of KVM while there some uncommitted data in ceph cache will this cache be committed prior cut-over to another host? Reading through the list I've got an impression that it may be left uncommitted and thus it may cause data corruption. I just would like a simple confirmation if code which commits cache on cut-over to new host does exist and no data corruption due to RBD cache+live migration should happen. Regards, Vladimir
QEMU does a flush on all the disks when it stops the guest on the original host, so there will be no uncommitted data in the cache. Josh -- To unsubscribe from this list: send the line "unsubscribe ceph-devel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
