Failed to get shared "write" lock Is another process using the image?

I am using Ubuntu 18.04 as the compute node and opennebula 5.6, When I was trying the opennebula HA, I am getting below error for my vm’s log file,

qemu-system-x86_64: -drive file=/var/lib/one//datastores/101/11/disk.0,format=qcow2,if=none,id=drive-virtio-disk0,cache=none: Failed to get “write” lock.

on opennebula front end side,I see below message on sched.log

Fri May 17 15:43:58 2019 [Z0][SCHED][D]: Match Making statistics:
Number of VMs: 1
Total time: 0s
Total Cluster Match time: 0s
Total Host Match time: 0.00s
Total Host Ranking time: 0.00s
Total DS Match time: 0.00s
Total DS Ranking time: 0.00s

Fri May 17 15:43:58 2019 [Z0][SCHED][D]: Scheduling Results:
Virtual Machine: 11

    PRI     ID - HOSTS
    ------------------------
    0       3

    PRI     ID - DATASTORES
    ------------------------
    1       101
    0.0464238       103
    0       0

Fri May 17 15:43:58 2019 [Z0][SCHED][D]: Dispatching VMs to hosts:
VMID Priority Host System DS
--------------------------------------------------------------
11 0 3 101

Fri May 17 15:43:58 2019 [Z0][SCHED][D]: Dispatching VMs to hosts. Total time: 0.39s
Fri May 17 15:44:29 2019 [Z0][SCHED][D]: Getting scheduled actions information. Total time: 0.01s
Fri May 17 15:44:29 2019 [Z0][SCHED][D]: Getting VM and Host information. Total time: 0.00s


I dont have any issues on live migrating vms among hosts, only issue is when the host A is powered off, VMs on host A does not move to Host B. The VMs state moves to failure.

Opennebula Front End and Node version - 5.6
Frontend OS - Ubuntu 18.04
Compute Node OS - Ubuntu 18.04
QEMU version on Compute nodes - 2.11

Hi!
Did you find a solution to this problem, i am facing the same issue.

regards
Martin