<html> <head> <meta http-equiv="content-type" content="text/html; charset=utf-8"> </head> <body text="#070040" bgcolor="#FFFFFF"> Hello, I started live migration job for a guest with the following command: <pre>virsh migrate --live --domain my-guest --verbose --persistent --copy-storage-all --desturi qemu+ssh://root@my-otherhost/system</pre> Guest system disk cache mode is none: <pre> <disk type='file' device='disk'> <driver name='qemu' type='qcow2' cache='none'/> <source file='/opt/datastore/bulutkare-1118.img'/> <backingStore/> <target dev='vda' bus='virtio'/> <alias name='virtio-disk0'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0'/> </disk> </pre> after live migration completed, filesystem blocked write operations. <pre>root@my-guest:~/tmp# touch hello touch: cannot touch ‘hello’: Read-only file system</pre> What can be the reason? What is the best of migrating a VM to a target machine? Additional info: Guest operating system is Ubuntu 14.04 x64 Source/Target Host operating system is Ubuntu 15.04 x64 Guest file system is ext4 + swap Source/Target Host file system is XFS Source/Target Qemu version 1.2.2 Source/Target libvirt 1.2.12 This is from target libvirt log. It can be important: /build/qemu-Bjjgxn/qemu-2.2+dfsg/nbd.c:nbd_co_receive_request():L1146: reading from socket failed </body> </html>