oVirt engine version is 4.4.7.6-1.el8.
cinderlib version is 3.0.0.
cinder version is openstack-victoria.

Below is the log that occurred while creating template from snapshot of the vm 
that uses mbs disk. (In /var/log/ovirt-engine/engine.log file)

2021-07-14 19:51:09,853+09 INFO  
[org.ovirt.engine.core.bll.AddVmTemplateFromSnapshotCommand] (default task-8) 
[83fa8cd5-d49f-4753-bf0e-5219d1be431f] Lock Acquired to object 
'EngineLock:{exclusiveLocks='[t=TEMPLATE_NAME, 
0474ad3a-86fc-4520-8028-63b89e5f075b=TEMPLATE]', 
sharedLocks='[f9c7a106-2855-4f3a-ac05-31aa316fb7bd=VM]'}'
2021-07-14 19:51:10,006+09 INFO  
[org.ovirt.engine.core.bll.AddVmTemplateFromSnapshotCommand] (default task-8) 
[83fa8cd5-d49f-4753-bf0e-5219d1be431f] Running command: 
AddVmTemplateFromSnapshotCommand internal: false. Entities affected :  ID: 
4ca6e0e8-e3a4-11eb-8830-480fcf63834f Type: StoragePoolAction group 
CREATE_TEMPLATE with role type USER
2021-07-14 19:51:10,306+09 INFO  
[org.ovirt.engine.core.bll.storage.disk.CreateAllTemplateDisksFromSnapshotCommand]
 (default task-8) [83fa8cd5-d49f-4753-bf0e-5219d1be431f] Running command: 
CreateAllTemplateDisksFromSnapshotCommand internal: true.
2021-07-14 19:51:10,399+09 INFO  
[org.ovirt.engine.core.dal.dbbroker.auditloghandling.AuditLogDirector] (default 
task-8) [83fa8cd5-d49f-4753-bf0e-5219d1be431f] EVENT_ID: 
USER_ADD_VM_TEMPLATE(48), Creation of Template t from VM <UNKNOWN> was 
initiated by admin@internal-authz.
2021-07-14 19:51:11,363+09 INFO  
[org.ovirt.engine.core.bll.ConcurrentChildCommandsExecutionCallback] 
(EE-ManagedScheduledExecutorService-engineScheduledThreadPool-Thread-49) 
[83fa8cd5-d49f-4753-bf0e-5219d1be431f] Command 
'CreateAllTemplateDisksFromSnapshot' id: '71a7d2b9-97c8-4f82-bd3c-98f4b85b5fe8' 
child commands '[]' executions were completed, status 'SUCCEEDED'
2021-07-14 19:51:12,641+09 INFO  
[org.ovirt.engine.core.bll.SerialChildCommandsExecutionCallback] 
(EE-ManagedScheduledExecutorService-engineScheduledThreadPool-Thread-65) 
[83fa8cd5-d49f-4753-bf0e-5219d1be431f] Command 'AddVmTemplateFromSnapshot' (id: 
'1bd7da61-39e5-483c-a16a-8f9d3d5d71aa') waiting on child command id: 
'71a7d2b9-97c8-4f82-bd3c-98f4b85b5fe8' 
type:'CreateAllTemplateDisksFromSnapshot' to complete
2021-07-14 19:51:12,761+09 INFO  
[org.ovirt.engine.core.bll.storage.disk.CreateAllTemplateDisksFromSnapshotCommand]
 (EE-ManagedScheduledExecutorService-engineScheduledThreadPool-Thread-65) 
[83fa8cd5-d49f-4753-bf0e-5219d1be431f] Ending command 
'org.ovirt.engine.core.bll.storage.disk.CreateAllTemplateDisksFromSnapshotCommand'
 successfully.
2021-07-14 19:51:13,874+09 ERROR 
[org.ovirt.engine.core.bll.storage.disk.image.TransferDiskImageCommand] 
(EE-ManagedScheduledExecutorService-engineScheduledThreadPool-Thread-42) 
[c2e68590-a1f1-4538-8210-542e395cbe0a] Finalizing failed transfer. Download 
disk 'GlanceDisk-34bec3e' (disk id: '373b681a-847d-44c5-a63e-fc890cd48020', 
image id: '30c80886-060b-4458-b303-cb2a978cc8a0')
2021-07-14 19:51:13,874+09 WARN  
[org.ovirt.engine.core.bll.storage.disk.image.TransferDiskImageCommand] 
(EE-ManagedScheduledExecutorService-engineScheduledThreadPool-Thread-42) 
[c2e68590-a1f1-4538-8210-542e395cbe0a] Failed to stop image transfer session. 
Ticket does not exist for image '373b681a-847d-44c5-a63e-fc890cd48020'
2021-07-14 19:51:14,119+09 INFO  
[org.ovirt.engine.core.bll.SerialChildCommandsExecutionCallback] 
(EE-ManagedScheduledExecutorService-engineScheduledThreadPool-Thread-42) 
[83fa8cd5-d49f-4753-bf0e-5219d1be431f] Command 'AddVmTemplateFromSnapshot' id: 
'1bd7da61-39e5-483c-a16a-8f9d3d5d71aa' child commands 
'[71a7d2b9-97c8-4f82-bd3c-98f4b85b5fe8]' executions were completed, status 
'SUCCEEDED'
2021-07-14 19:51:15,386+09 INFO  
[org.ovirt.engine.core.bll.AddVmTemplateFromSnapshotCommand] 
(EE-ManagedScheduledExecutorService-engineScheduledThreadPool-Thread-15) 
[83fa8cd5-d49f-4753-bf0e-5219d1be431f] Ending command 
'org.ovirt.engine.core.bll.AddVmTemplateFromSnapshotCommand' successfully.
2021-07-14 19:51:15,424+09 INFO  
[org.ovirt.engine.core.bll.AddVmTemplateFromSnapshotCommand] 
(EE-ManagedScheduledExecutorService-engineScheduledThreadPool-Thread-15) 
[83fa8cd5-d49f-4753-bf0e-5219d1be431f] Lock freed to object 
'EngineLock:{exclusiveLocks='[t=TEMPLATE_NAME, 
0474ad3a-86fc-4520-8028-63b89e5f075b=TEMPLATE]', 
sharedLocks='[f9c7a106-2855-4f3a-ac05-31aa316fb7bd=VM]'}'
2021-07-14 19:51:15,649+09 INFO  
[org.ovirt.engine.core.dal.dbbroker.auditloghandling.AuditLogDirector] 
(EE-ManagedScheduledExecutorService-engineScheduledThreadPool-Thread-15) 
[83fa8cd5-d49f-4753-bf0e-5219d1be431f] EVENT_ID: 
USER_ADD_VM_TEMPLATE_FINISHED_SUCCESS(51), Creation of Template t from VM 
<UNKNOWN> has been completed.

Below is the log that occurred while creating new vm using template. (In 
/var/log/ovirt-engine/engine.log file)

2021-07-14 19:53:44,010+09 INFO  [org.ovirt.engine.core.bll.RunVmCommand] 
(default task-7) [3db584e0-37f8-4d73-b6e8-92cb8a3eab11] Lock Acquired to object 
'EngineLock:{exclusiveLocks='[95dc79af-b873-4838-9d49-260cef4a87c1=VM]', 
sharedLocks=''}'
2021-07-14 19:53:44,042+09 ERROR 
[org.ovirt.engine.core.dal.dbbroker.auditloghandling.AuditLogDirector] (default 
task-7) [3db584e0-37f8-4d73-b6e8-92cb8a3eab11] EVENT_ID: 
USER_FAILED_RUN_VM(54), Failed to run VM vm2 due to a failed validation: 
[Cannot run VM without at least one bootable disk.
Alternatives:
- Create a disk for this VM, and rerun the VM.
- Change the boot sequence using the Edit VM command (Boot Option Sub-Tab).
- Use the 'Run Once' command to select a different boot option and rerun the 
VM.] (User: admin@internal-authz).
2021-07-14 19:53:44,042+09 WARN  [org.ovirt.engine.core.bll.RunVmCommand] 
(default task-7) [3db584e0-37f8-4d73-b6e8-92cb8a3eab11] Validation of action 
'RunVm' failed for user admin@internal-authz. Reasons: 
VAR__ACTION__RUN,VAR__TYPE__VM,VM_CANNOT_RUN_FROM_DISK_WITHOUT_DISK
2021-07-14 19:53:44,042+09 INFO  [org.ovirt.engine.core.bll.RunVmCommand] 
(default task-7) [3db584e0-37f8-4d73-b6e8-92cb8a3eab11] Lock freed to object 
'EngineLock:{exclusiveLocks='[95dc79af-b873-4838-9d49-260cef4a87c1=VM]', 
sharedLocks=''}'

During the above process, there is no log in 
/var/log/ovirt-engine/cinderlib/cinderlib.log file.
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