NOTES:
Component related, I selected "services" as I was not sure which component group to select.
Version (above) could not find matching as in oVirt it is  4.20.27

Description of problem:

When trying to start imported VM, it fails with following message:
 
ERROR [org.ovirt.engine.core.dal.dbbroker.auditloghandling.AuditLogDirector] (ForkJoinPool-1-worker-2) [] EVENT_ID: VM_DOWN_ERROR(119), VM instance-00000673 is down with error. Exit message: Cannot access backing file '/var/lib/nova/instances/_base/2f4f8c5fc11bb83bcab03f4c829ddda4da8c0bce' of storage file '/rhev/data-center/mnt/glusterSD/aws-gfs-01.awesome.lan:_gv0__he/2607c265-248c-40ad-b020-f3756454839e/images/816ac00f-ba98-4827-b5c8-42a8ba496089/8ecfcd5b-db67-4c23-9869-0e20d7553aba' (as uid:107, gid:107): No such file or directory.

Version-Release number of selected component (if applicable):

OS Version:
RHEL - 7 - 5.1804.el7.centos.2
OS Description:
CentOS Linux 7 (Core)
Kernel Version:
3.10.0 - 862.3.2.el7.x86_64
KVM Version:
2.10.0 - 21.el7_5.3.1
LIBVIRT Version:
libvirt-3.9.0-14.el7_5.5
VDSM Version:
vdsm-4.20.27.1-1.el7.centos


How reproducible:

Every Time


Steps to Reproduce:
1. qemu+tcp connect, from oVirt UI, to OpenStack KVM 
2. select and import single vm instance from Nova
3. 

Actual results:

VM Not able to boot due to inability to access backing file.

Expected results:

VM Single independent Image imported and bootable.

Additional info:

When trying to start imported VM, it fails with following message:
 
ERROR [org.ovirt.engine.core.dal.dbbroker.auditloghandling.AuditLogDirector] (ForkJoinPool-1-worker-2) [] EVENT_ID: VM_DOWN_ERROR(119), VM instance-00000673 is down with error. Exit message: Cannot access backing file '/var/lib/nova/instances/_base/2f4f8c5fc11bb83bcab03f4c829ddda4da8c0bce' of storage file '/rhev/data-center/mnt/glusterSD/aws-gfs-01.awesome.lan:_gv0__he/2607c265-248c-40ad-b020-f3756454839e/images/816ac00f-ba98-4827-b5c8-42a8ba496089/8ecfcd5b-db67-4c23-9869-0e20d7553aba' (as uid:107, gid:107): No such file or directory.
 
Platform details:
Ovirt SHE
Version 4.2.2.6-1.el7.centos
GlusterFS, unmanaged by oVirt.
 
VM is imported & converted from OpenStack, according to log files, successfully (one WARN, related to different MAC address):
2018-05-24 12:03:31,028+02 INFO  [org.ovirt.engine.core.vdsbroker.vdsbroker.GetVmsNamesFromExternalProviderVDSCommand] (default task-29) [cc5931a2-1af5-4d65-b0b3-362588db9d3f] FINISH, GetVmsNamesFromExternalProviderVDSCommand, return: [VM [instance-0001f94c], VM [instance-00078f6a], VM [instance-00000814], VM [instance-0001f9ac], VM [instance-000001ff], VM [instance-0001f718], VM [instance-00000673], VM [instance-0001ecf2], VM [instance-00078d38]], log id: 7f178a5e
2018-05-24 12:48:33,722+02 INFO  [org.ovirt.engine.core.vdsbroker.vdsbroker.GetVmsNamesFromExternalProviderVDSCommand] (default task-8) [103d56e1-7449-4853-ae50-48ee94d43d77] FINISH, GetVmsNamesFromExternalProviderVDSCommand, return: [VM [instance-0001f94c], VM [instance-00078f6a], VM [instance-00000814], VM [instance-0001f9ac], VM [instance-000001ff], VM [instance-0001f718], VM [instance-00000673], VM [instance-0001ecf2], VM [instance-00078d38]], log id: 3aa178c5
2018-05-24 12:48:47,291+02 INFO  [org.ovirt.engine.core.vdsbroker.vdsbroker.GetVmsFullInfoFromExternalProviderVDSCommand] (default task-17) [4bf555c7-9d64-4ecc-b059-8a60a4b27bdd] START, GetVmsFullInfoFromExternalProviderVDSCommand(HostName = aws-ovhv-01, GetVmsFromExternalProviderParameters:{hostId='cbabe1e8-9e7f-4c4b-be9c-49154953564d', url='qemu+tcp://root.0.12/system', username='null', originType='KVM', namesOfVms='[instance-00000673]'}), log id: 4c445109
2018-05-24 12:48:47,318+02 INFO  [org.ovirt.engine.core.vdsbroker.vdsbroker.GetVmsFullInfoFromExternalProviderVDSCommand] (default task-17) [4bf555c7-9d64-4ecc-b059-8a60a4b27bdd] FINISH, GetVmsFullInfoFromExternalProviderVDSCommand, return: [VM [instance-00000673]], log id: 4c445109
2018-05-24 12:49:20,466+02 INFO  [org.ovirt.engine.core.bll.exportimport.ImportVmFromExternalProviderCommand] (default task-41) [14edb003-b4a0-4355-b3de-da2b68774fe3] Lock Acquired to object 'EngineLock:{exclusiveLocks='[instance-00000673=VM_NAME, 1f0b608f-7cfc-4b27-a876-b5d8073011a1=VM]', sharedLocks=''}'
2018-05-24 12:49:20,586+02 WARN  [org.ovirt.engine.core.dal.dbbroker.auditloghandling.AuditLogDirector] (EE-ManagedThreadFactory-engine-Thread-653408) [14edb003-b4a0-4355-b3de-da2b68774fe3] EVENT_ID: MAC_ADDRESS_IS_EXTERNAL(925), VM instance-00000673 has MAC address(es) fa:16:3e:74:18:50, which is/are out of its MAC pool definitions.
2018-05-24 12:49:21,021+02 INFO  [org.ovirt.engine.core.dal.dbbroker.auditloghandling.AuditLogDirector] (EE-ManagedThreadFactory-engine-Thread-653408) [14edb003-b4a0-4355-b3de-da2b68774fe3] EVENT_ID: IMPORTEXPORT_STARTING_IMPORT_VM(1,165), Starting to import Vm instance-00000673 to Data Center AVEUNL, Cluster AWSEUOPS
2018-05-24 12:49:28,816+02 INFO  [org.ovirt.engine.core.bll.exportimport.ImportVmFromExternalProviderCommand] (EE-ManagedThreadFactory-engine-Thread-653407) [] Lock freed to object 'EngineLock:{exclusiveLocks='[instance-00000673=VM_NAME, 1f0b608f-7cfc-4b27-a876-b5d8073011a1=VM]', sharedLocks=''}'
2018-05-24 12:49:28,911+02 INFO  [org.ovirt.engine.core.vdsbroker.vdsbroker.ConvertVmVDSCommand] (EE-ManagedThreadFactory-commandCoordinator-Thread-2) [2047673e] START, ConvertVmVDSCommand(HostName = aws-ovhv-01, ConvertVmVDSParameters:{hostId='cbabe1e8-9e7f-4c4b-be9c-49154953564d', url='qemu+tcp://root.0.12/system', username='null', vmId='1f0b608f-7cfc-4b27-a876-b5d8073011a1', vmName='instance-00000673', storageDomainId='2607c265-248c-40ad-b020-f3756454839e', storagePoolId='5a5de92c-0120-0167-03cb-00000000038a', virtioIsoPath='null', compatVersion='null', Disk0='816ac00f-ba98-4827-b5c8-42a8ba496089'}), log id: 53408517
2018-05-24 12:49:29,010+02 INFO  [org.ovirt.engine.core.dal.dbbroker.auditloghandling.AuditLogDirector] (EE-ManagedThreadFactory-commandCoordinator-Thread-2) [2047673e] EVENT_ID: IMPORTEXPORT_STARTING_CONVERT_VM(1,193), Starting to convert Vm instance-00000673
2018-05-24 12:52:57,982+02 INFO  [org.ovirt.engine.core.bll.UpdateVmCommand] (default task-16) [df1d5f72-eb17-46e4-9946-20ca9809b54c] Failed to Acquire Lock to object 'EngineLock:{exclusiveLocks='[instance-00000673=VM_NAME]', sharedLocks='[1f0b608f-7cfc-4b27-a876-b5d8073011a1=VM]'}'
2018-05-24 12:59:24,575+02 INFO  [org.ovirt.engine.core.dal.dbbroker.auditloghandling.AuditLogDirector] (EE-ManagedThreadFactory-engineScheduled-Thread-20) [2047673e] EVENT_ID: IMPORTEXPORT_IMPORT_VM(1,152), Vm instance-00000673 was imported successfully to Data Center AVEUNL, Cluster AWSEUOPS
 
Than trying to start VM fails with following messages:
2018-05-24 13:00:32,085+02 INFO  [org.ovirt.engine.core.dal.dbbroker.auditloghandling.AuditLogDirector] (EE-ManagedThreadFactory-engine-Thread-653729) [] EVENT_ID: USER_STARTED_VM(153), VM instance-00000673 was started by admin@internal-authz (Host: aws-ovhv-06).
2018-05-24 13:00:33,417+02 INFO  [org.ovirt.engine.core.vdsbroker.monitoring.VmAnalyzer] (ForkJoinPool-1-worker-9) [] VM '1f0b608f-7cfc-4b27-a876-b5d8073011a1'(instance-00000673) moved from 'WaitForLaunch' --> 'Down'
2018-05-24 13:00:33,436+02 ERROR [org.ovirt.engine.core.dal.dbbroker.auditloghandling.AuditLogDirector] (ForkJoinPool-1-worker-9) [] EVENT_ID: VM_DOWN_ERROR(119), VM instance-00000673 is down with error. Exit message: Cannot access backing file '/var/lib/nova/instances/_base/2f4f8c5fc11bb83bcab03f4c829ddda4da8c0bce' of storage file '/rhev/data-center/mnt/glusterSD/aws-gfs-01.awesome.lan:_gv0__he/2607c265-248c-40ad-b020-f3756454839e/images/816ac00f-ba98-4827-b5c8-42a8ba496089/8ecfcd5b-db67-4c23-9869-0e20d7553aba' (as uid:107, gid:107): No such file or directory.
2018-05-24 13:00:33,437+02 INFO  [org.ovirt.engine.core.vdsbroker.monitoring.VmAnalyzer] (ForkJoinPool-1-worker-9) [] add VM '1f0b608f-7cfc-4b27-a876-b5d8073011a1'(instance-00000673) to rerun treatment
2018-05-24 13:00:33,455+02 WARN  [org.ovirt.engine.core.dal.dbbroker.auditloghandling.AuditLogDirector] (EE-ManagedThreadFactory-engine-Thread-653732) [] EVENT_ID: USER_INITIATED_RUN_VM_FAILED(151), Failed to run VM instance-00000673 on Host aws-ovhv-06.
2018-05-24 13:00:33,460+02 ERROR [org.ovirt.engine.core.dal.dbbroker.auditloghandling.AuditLogDirector] (EE-ManagedThreadFactory-engine-Thread-653732) [] EVENT_ID: USER_FAILED_RUN_VM(54), Failed to run VM instance-00000673  (User: admin@internal-authz).
 
Checking on the Gluster volume, directory and files exist, permissions are in order:
 
[root@aws-ovhv-01 816ac00f-ba98-4827-b5c8-42a8ba496089]
-rw-rw----.  1 vdsm kvm  14G May 24 12:59 8ecfcd5b-db67-4c23-9869-0e20d7553aba
-rw-rw----.  1 vdsm kvm 1.0M May 24 12:49 8ecfcd5b-db67-4c23-9869-0e20d7553aba.lease
-rw-r--r--.  1 vdsm kvm  310 May 24 12:49 8ecfcd5b-db67-4c23-9869-0e20d7553aba.meta
 
Than I have checked image info, and noticed that backing file entry is pointing to non-existing location, which does and should not exist on oVirt hosts:
 
[root@aws-ovhv-01 816ac00f-ba98-4827-b5c8-42a8ba496089]# qemu-img info 8ecfcd5b-db67-4c23-9869-0e20d7553aba
image: 8ecfcd5b-db67-4c23-9869-0e20d7553aba
file format: qcow2
virtual size: 160G (171798691840 bytes)
disk size: 14G
cluster_size: 65536
backing file: /var/lib/nova/instances/_base/2f4f8c5fc11bb83bcab03f4c829ddda4da8c0bce
Format specific information:
    compat: 1.1
    lazy refcounts: false
    refcount bits: 16
    corrupt: false
 
Can somebody advise me how to fix, address this, as I am in need of importing 200+ VMs from OpenStack to oVirt?