[ovirt-users] Snapshot deletion failure

[nicolas at devels.es]

Hi,

We're trying to delete an auto-generated live snapshot that has been 
created after migrating an online VM's storage to a different domain. 
oVirt version is 3.6.6 and VDSM version is 4.17.28. Most relevant log 
lines are:

     2016-06-24 07:50:36,252 ERROR 
[org.ovirt.engine.core.vdsbroker.vdsbroker.MergeVDSCommand] 
(pool-7-thread-10) [799a22e3] Failed in 'MergeVDS' method
     2016-06-24 07:50:36,256 ERROR 
[org.ovirt.engine.core.dal.dbbroker.auditloghandling.AuditLogDirector] 
(pool-7-thread-10) [799a22e3] Correlation ID: null, Call Stack: null, 
Custom Event ID: -1, Message: VDSM host2.domain.com command failed: 
Merge failed
     2016-06-24 07:50:36,256 ERROR 
[org.ovirt.engine.core.vdsbroker.vdsbroker.MergeVDSCommand] 
(pool-7-thread-10) [799a22e3] Command 'MergeVDSCommand(HostName = 
host2.domain.com, MergeVDSCommandParameters:{runAsync='true', 
hostId='c31dca1a-e5bc-43f6-940f-6397e3ddbee4', 
vmId='7083832a-a1a2-42b7-961f-2e9c0dcd7e18', 
storagePoolId='fa155d43-4e68-486f-9f9d-ae3e3916cc4f', 
storageDomainId='9339780c-3667-4fef-aa13-9bec08957c5f', 
imageGroupId='65a0b0d4-5c96-4dd9-a31b-4d08e40a46a5', 
imageId='9eec9e8f-38db-4abf-b1c4-92fa9383f8b1', 
baseImageId='568b2f77-0ddf-4349-a45c-36fcb0edecb6', 
topImageId='9eec9e8f-38db-4abf-b1c4-92fa9383f8b1', bandwidth='0'})' 
execution failed: VDSGenericException: VDSErrorException: Failed to 
MergeVDS, error = Merge failed, code = 52
     2016-06-24 07:50:36,256 ERROR 
[org.ovirt.engine.core.bll.MergeCommand] (pool-7-thread-10) [799a22e3] 
Engine exception thrown while sending merge command: 
org.ovirt.engine.core.common.errors.EngineException: EngineException: 
org.ovirt.engine.core.vdsbroker.vdsbroker.VDSErrorException: 
VDSGenericException: VDSErrorException: Failed to MergeVDS, error = 
Merge failed, code = 52 (Failed with error mergeErr and code 52)

I'm attaching relevant logs (both for ovirt-engine and SPM's vdsm).

What could be the reason for this error?

Thanks.
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