于 2011年07月18日 08:54, zhang xintao 写道: commit 62ed801c13787cc844e75db7cd2d4c8a42454fcc Author: Laine Stump<laine(a)laine.org> Date: Fri Jun 3 11:59:09 2011 -0400 security driver: ignore EINVAL when chowning an image file This fixes: https://bugzilla.redhat.com/show_bug.cgi?id=702044 https://bugzilla.redhat.com/show_bug.cgi?id=709454 Both of these complain of a failure to use an image file that resides on a read-only NFS volume. The function in the DAC security driver that chowns image files to the qemu user:group before using them already has special cases to ignore failure of chown on read-only file systems, and in a few other cases, but it hadn't been checking for EINVAL, which is what is returned if the qemu user doesn't even exist on the NFS server. Since the explanation of EINVAL in the chown man page almost exactly matches the log message already present for the case of EOPNOTSUPP, I've just added EINVAL to that same conditional. The above commit fixed your problem, you might mount the nfs on the dest host in readonly mode. So you have two choices to work around the problem, 1) update libvirt with this fix, unfortunately, the fix is in realeases since 0.9.2. 2) mount your nfs in proper permission mode on destination host. Regards Osier