On 10/22/2013 05:07 AM, Zhanghaoyu (A) wrote: >> >> NBD is used whenever both src and dst of migration is new enough to use it. >> That is, libvirt >= 1.0.3 and qemu >= 1.0.3. The NBD is turned on by libvirt >> whenever the conditions are met. User has no control over this. >> The advantage is: only specified disks can be transferred (currently not >> supported in libvirt), the previous implementation was buggy (according to >> some qemu developers), the storage is migrated via separate channel (a new >> connection) so it can be possible (in the future) to split migration of RAM >> + internal state and storage. > > Could you make a detailed statement for the buggy previous implementation, > please ?
The bugs were in qemu, not libvirt; so you'll get a more complete answer from the qemu list. I wish I knew enough details to give a better answer, rather than just pointing you back to the other list; I just know that the qemu developers recommended avoiding that mode of migration with storage. -- Eric Blake eblake redhat com +1-919-301-3266 Libvirt virtualization library http://libvirt.org
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