Hi, I am running ubuntu 9.10, with kvm and libvirt-bin, etc. Using virsh, I can't live-migrate a VM from host1 to host2. It reports a unknown failure. The VM image is accessible on both source and destination hosts located on a shared storage using nfs. Image directory is on the same path on both hosts. The src and destination hosts are on the same subnet. I can connect to remote host with qemu+ssh but I can't migrate. my configuration is: $ uname -a Linux mahsa1-desktop 2.6.31-21-generic-pae #59-Ubuntu SMP Wed Mar 24 08:47:55 UTC 2010 i686 GNU/Linux $virsh # version Compiled against library: libvir 0.7.0 Using library: libvir 0.7.0 Using API: QEMU 0.7.0 Running hypervisor: QEMU 0.11.0 Connect to the local machine's hypervisor as follows and see the localmachines:$virsh # connect qemu:///system $virsh # list Id Name State -------------------------------- 2 VmLinux11 running 3 VMLinux12 running 4 VmLinux13 running Verify connectivity to the hypervisor of the remote target system asfollows:$virsh connect qemu+ssh://host2name/system Attempt the migration as follows:$virsh migrate --live VmLinux13 qemu+ssh://host2name/system Connecting to uri: qemu:///system root@host2name's password: error: Unknown failure the log file on the source physical host gives this:14:57:13.514: error : remoteIO:7184 : operation failed: migrate failed: migrate "tcp:host2name:49161" migration failed 14:57:13.709: error : remoteIO:7184 : Unknown failure I disable the firewall on both hosts but it doesn't still work. please help me.