On Fri, Feb 17, 2017 at 12:33:28 +0100, Gionatan Danti wrote: > Hi list, > I would like to understand if, and why, the --unsafe flag is needed when > using --copy-storage-all when migrating guests which uses writeback > cache mode. > > Background: I want to live migrate guests with writeback cache from host > A to host B and these hosts only have local storage (ie: no shared > storage at all). > > From my understanding, --unsafe should be only required when migrating > writeback-enabled guests between two hosts which share non-cluster-aware > storage (ie: NFS), but it should not be necessary when not sharing storage. I think your understanding is correct. > 1) it is safe to do a live migration with --copy-storage-all when guests > are using writeback cache mode? Yeah storage migration should be safe regardless of the cache mode used. > 2) if so, why libvirt complains about that? This looks like a bug in libvirt. The code doesn't check whether an affected disk is going to be migrated (--copy-storage-all) or accessed on the shared storage. Jirka _______________________________________________ libvirt-users mailing list libvirt-users@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/libvirt-users
