Migrated or Evacuated VMs fail to start on destination host when the source host crashes. The following error is observed in log /var/log/pf9/ostackhost.log.
2019-10-27 20:39:11.569 ERROR nova.virt.libvirt.driver [req-7638759c-10a6-40c5-86f9-4bda4b2dfb82 masakari services] [instance: 65c55b81-9078-44b4-bb07-95dc5adeadba] Failed to start libvirt guest: internal error: qemu unexpectedly closed the monitor: 2019-10-28T00:39:09.301445Z qemu-kvm: -drive file=/mnt/nfs/instances/65c55b81-9078-44b4-bb07-95dc5adeadba/disk,format=qcow2,if=none,id=drive-virtio-disk0,cache=none: Failed to get "write" lock
- Platform9 Managed OpenStack - v3.6.0 and Higher
- Limitation in NFSv3.
- Wait for the crashed host to come back online.
- Once the crashed host is online, reboot the VMs which failed to get a write-lock.