RHV: moved thin-provisioned disk from file to block storage and then rebooted VM, now the disk seems corrupted

Solution Verified - Updated -


  • Disk that was previously moved to a block storage domain. After rebooting the VM the disk appears corrupted from inside the VM, file-systems cannot mount and/or system won't boot.
  • Upon closer inspection, the Virtual Machine sees a qcow2 header on the disk.
  • Disk is Thin-Provisioned and was moved live from Gluster/NFS to iSCSI/FibreChannel before the reboot of the VM.
  • Virtual Machine XML contains RAW type for the disk, but the disk is QCOW2


  • Red Hat Virtualization 4.4
    • vdsm-4.40.22-1.el8ev.x86_64
    • ovirt-engine-

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