[libvirt-users] share nothing live migration causes read only filesystem

[Fırat KÜÇÜK]

Hello,

I started live migration job for a guest with the following command:

virsh migrate --live --domain my-guest --verbose --persistent --copy-storage-all --desturi qemu+ssh://root@my-otherhost/system


Guest system disk cache mode is none:

     <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>

after live migration completed, filesystem blocked write operations.

root at my-guest:~/tmp# touch hello
touch: cannot touch ‘hello’: Read-only file system


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






















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