Hi Eric, As QEMU 1.2 is released, I don't find the feature you describe in the change log. http://wiki.qemu.org/ChangeLog/1.2 Does it mean that we will not have this feature in the coming release? Thanks.
Regards, Chun-Hung On Wed, Jul 11, 2012 at 7:37 AM, Eric Blake <ebl...@redhat.com> wrote: > On 07/10/2012 04:24 AM, Chun-Hung Chen wrote: > > Dear all, > > > > I am planning to use live block migration with one VM running on local > disk > > and also attached additional disk from iSCSI or other shared storage. > > When block migration, not only local VM disk is copied to the destination > > but also the attached additional disk from shared storage. It is not > > desired in this situation. > > I just want the local VM disk is copied. Is there anyway to do this > > scenario? > > Unfortunately, block migration during migration is an all-or-none > prospect. And qemu 1.1 does not provide enough tools to do anything > differently, short of creating a snapshot file where the snapshot delta > is on shared storage, and then you manually copy the backing file into > place on the destination, then migrate without copying storage; but > there is no way to coalesce things back into one file once you take the > snapshot. > > Qemu 1.2 will be adding some new features that allow for block storage > migration as well as live commits (coalescing a delta snapshot file back > into its backing file) which can then be exposed through libvirt to > provide more functionality into what you want to do. > > > Does the concept of storage pool help this? I browse the source > > code but don't find hints right now. > > A storage pool lets you inform libvirt where your shared storage lives, > but does not help with the aspect of whether live storage migration is > possible in the underlying qemu. > > -- > Eric Blake ebl...@redhat.com +1-919-301-3266 > Libvirt virtualization library http://libvirt.org > >
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