Please backport the fix for the following upstream bug to Mitaka series:
https://bugs.launchpad.net/nova/+bug/1605720
--- Environment ---
* Mirantis OpenStack 9.2
* Qcow format for images
* Backend for ephemeral disks: file
--- Steps to reproduce ---
1) Build a new environment with at least 2 compute nodes
2) Create a new flavor with ephemeral disk
[root@node-2 ~]$ nova flavor-create --ephemeral 2 MigrationTest 10 512 0 1
+----+---------------+-----------+------+-----------+------+-------+-------------+-----------+
| ID | Name | Memory_MB | Disk | Ephemeral | Swap | VCPUs | RXTX_Factor | Is_Public |
+----+---------------+-----------+------+-----------+------+-------+-------------+-----------+
| 10 | MigrationTest | 512 | 0 | 2 | | 1 | 1.0 | True |
+----+---------------+-----------+------+-----------+------+-------+-------------+-----------+
3) Boot an instance based on this flavor
[root@node-2 ~]$ nova boot --image TestVM --flavor MigrationTest --nic net-id=d6bd7512-4f7e-46e1-8209-1dcc2f6ad44e MyVM-1 |
4) Migrate the instance
nova migrate --poll MyVM-1
--- Actual result ---
Server migrating... 0% complete
Error migrating server
ERROR (ResourceInErrorState):
In the nova-compute.log on target Compute node:
libvirtError: Cannot access backing file '/var/lib/nova/instances/_base/ephemeral_2_0706d66' of storage file '/var/lib/nova/instances/a1cbe06d-15f6-45b2-b17e-42bf250093ee/disk.eph0' (as uid:108, gid:117): No such file or directory
--- Expected result ---
The migration has successfully performed
sla1 for 9.0-updates