On Fri, Feb 13, 2015 at 2:01 PM, Eric Blake <ebl...@redhat.com> wrote:
> On 02/12/2015 07:41 PM, Edward Young wrote: > > Hi all, > > > > > > When I live migrate a vm using > > > > "migrate --live --copy-storage-all mig-vm qemu+ssh://192.168.1.3/system > > tcp://192.168.1.3" > > > > > > I got the following error > > > > > > WARNING: Image format was not specified for > > 'nbd://node2:49155/drive-virtio-disk0' and probing guessed raw. > > > > 258 Automatically detecting the format is dangerous for raw > > images, write operations on block 0 will be restricted. > > > > 259 Specify the 'raw' format explicitly to remove the > restrictions. > > > > Was that error printed by the source or the destination qemu? It may be > a bug in libvirt for not explicitly requesting raw (we DO want the NBD > server to be raw, but need to be explicit so as to avoid unsafe probing). > This error was printed from the source in deed. > > > > >>From the error itself, I can tell that nbd server treat this image as > raw, > > rather than qcow2. My platform is libvirt+qemu. the image type of this vm > > is indeed qcow2. I do not know how to let nbd know this image format. > > Just because the underlying file on the disk is qcow2 does not impact > what the NBD is serving - the NBD connection MUST be raw, unless you > have a funky situation with a qcow2 file whose contents are also a > nested qcow2 encoding of data. > OK, I got it. Thanks! Ed > > -- > Eric Blake eblake redhat com +1-919-301-3266 > Libvirt virtualization library http://libvirt.org > >
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