Description of problem: While refreshing the direct LUN, the UI is showing below error. === Error while executing action: Cannot sync Virtual Disk. Related operation is currently in progress. Please try again later. === However, the action is successfully executed and the same can be seen in the engine logs. === 2020-05-20 09:10:43,710-04 INFO [org.ovirt.engine.core.bll.storage.pool.SyncDirectLunsCommand] (EE-ManagedThreadFactory-engine-Thread-176125) [cbe4c640-9e7c-4824-81d0-3f189e9e39fc] Lock Acquired to object 'EngineLock:{exclusiveLocks='[dbaf79e7-29d1-491a-be49-3a94bd91b7cc=DISK]', sharedLocks=''}' 2020-05-20 09:10:43,730-04 INFO [org.ovirt.engine.core.bll.storage.pool.SyncDirectLunsCommand] (EE-ManagedThreadFactory-engine-Thread-176124) [cbe4c640-9e7c-4824-81d0-3f189e9e39fc] Failed to Acquire Lock to object 'EngineLock:{exclusiveLocks='[dbaf79e7-29d1-491a-be49-3a94bd91b7cc=DISK]', sharedLocks=''}' 2020-05-20 09:10:43,730-04 INFO [org.ovirt.engine.core.bll.storage.pool.SyncDirectLunsCommand] (EE-ManagedThreadFactory-engine-Thread-176126) [cbe4c640-9e7c-4824-81d0-3f189e9e39fc] Failed to Acquire Lock to object 'EngineLock:{exclusiveLocks='[dbaf79e7-29d1-491a-be49-3a94bd91b7cc=DISK]', sharedLocks=''}' 2020-05-20 09:10:43,731-04 WARN [org.ovirt.engine.core.bll.storage.pool.SyncDirectLunsCommand] (EE-ManagedThreadFactory-engine-Thread-176124) [cbe4c640-9e7c-4824-81d0-3f189e9e39fc] Validation of action 'SyncDirectLuns' failed for user admin@internal-authz. Reasons: VAR__ACTION__SYNC,VAR__TYPE__DISK,ACTION_TYPE_FAILED_OBJECT_LOCKED 2020-05-20 09:10:43,731-04 WARN [org.ovirt.engine.core.bll.storage.pool.SyncDirectLunsCommand] (EE-ManagedThreadFactory-engine-Thread-176126) [cbe4c640-9e7c-4824-81d0-3f189e9e39fc] Validation of action 'SyncDirectLuns' failed for user admin@internal-authz. Reasons: VAR__ACTION__SYNC,VAR__TYPE__DISK,ACTION_TYPE_FAILED_OBJECT_LOCKED 2020-05-20 09:10:44,216-04 INFO [org.ovirt.engine.core.dal.dbbroker.auditloghandling.AuditLogDirector] (default task-120) [cbe4c640-9e7c-4824-81d0-3f189e9e39fc] EVENT_ID: SYNC_DIRECT_LUNS_STARTED(1,054), Direct LUN synchronization started. 2020-05-20 09:10:45,484-04 INFO [org.ovirt.engine.core.bll.storage.pool.SyncDirectLunsCommand] (default task-120) [cbe4c640-9e7c-4824-81d0-3f189e9e39fc] LUNs with IDs: [3600140560f551776b614ebe9304fb651] were updated in the DB. 2020-05-20 09:10:45,512-04 INFO [org.ovirt.engine.core.dal.dbbroker.auditloghandling.AuditLogDirector] (default task-120) [cbe4c640-9e7c-4824-81d0-3f189e9e39fc] EVENT_ID: SYNC_DIRECT_LUNS_FINISHED(1,055), Direct LUN synchronization finished. ==== Version-Release number of selected component (if applicable): rhvm-4.3.9.4-11.el7.noarch How reproducible: 100% Steps to Reproduce: 1. Login to RHV-M => Disks => Run refresh LUN on any direct LUN. Actual results: Refresh LUN is showing UI error "Cannot sync Virtual Disk. Related operation is currently in progress" Expected results: Refresh LUN should not show any error. Additional info: