Dell EMC Unity: Replication Resume message after failing over with sync indicates a full sync operation
Summary: Dell EMC Unity: Replication Resume message after failing over with sync indicates a full sync operation
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Symptoms
This message is a new feature introduced in Unity OE 5.0.x, which is now being corrected by Dell EMC Unity Development.
For all Dell EMC Unity Arrays running 5.0.X, The "Resume" replication session option after failing over with sync to the destination, will give a summary to confirm the operation indicating that a full sync operation will be initiated for all the sessions by this option.
The Message is as Following:
Replication will resume in the reverse direction after a failover. It will start synchronizing data to the original source storage resource based on the replication session RPO settings. All sessions will start a full synchronization to the original source storage resource. [Note: If this is a synchronous session, the data will start synchronizing immediately after resuming].
Do you want to resume the session?
For all Dell EMC Unity Arrays running 5.0.X, The "Resume" replication session option after failing over with sync to the destination, will give a summary to confirm the operation indicating that a full sync operation will be initiated for all the sessions by this option.
The Message is as Following:
Replication will resume in the reverse direction after a failover. It will start synchronizing data to the original source storage resource based on the replication session RPO settings. All sessions will start a full synchronization to the original source storage resource. [Note: If this is a synchronous session, the data will start synchronizing immediately after resuming].
Do you want to resume the session?
Cause
The resume summary message is incorrect
Resolution
The resume summary message is incorrect and will be rectified in a future Unity OE release.
The correct Messages should be:
Failback Confirmation Message
Failback will perform a synchronization from the destination storage resource to the source storage resource, block access to the destination storage resource to allow it to be used for replication, and change the source storage resource access to read/write mode. Replication will then resume. The synchronization could be either delta or full synchronization depending on the replicated snapshots. This operation will be lengthy if a full synchronization is needed during failback.
When the failback operation is complete, you can then connect your hosts to the source storage resource.
Note: Before you begin, you should block writes to the destination storage resource because it will be placed in read-only mode.
Resume Confirmation On Failed Over
Replication will resume in the reverse direction after a failover. It will start synchronizing data to the original source storage resource based on the replication session RPO settings.
All sessions will start a synchronization to the original source storage resource. The synchronization could be either delta or full synchronization depending on the replicated snapshots.
Note: If this is a synchronous session, the data will start synchronizing immediately after resuming. Do you want to resume the session?
The correct Messages should be:
Failback Confirmation Message
Failback will perform a synchronization from the destination storage resource to the source storage resource, block access to the destination storage resource to allow it to be used for replication, and change the source storage resource access to read/write mode. Replication will then resume. The synchronization could be either delta or full synchronization depending on the replicated snapshots. This operation will be lengthy if a full synchronization is needed during failback.
When the failback operation is complete, you can then connect your hosts to the source storage resource.
Note: Before you begin, you should block writes to the destination storage resource because it will be placed in read-only mode.
Resume Confirmation On Failed Over
Replication will resume in the reverse direction after a failover. It will start synchronizing data to the original source storage resource based on the replication session RPO settings.
All sessions will start a synchronization to the original source storage resource. The synchronization could be either delta or full synchronization depending on the replicated snapshots.
Note: If this is a synchronous session, the data will start synchronizing immediately after resuming. Do you want to resume the session?
Affected Products
Dell EMC Unity FamilyProducts
Dell Unity 300, Dell EMC Unity 300F, Dell EMC Unity XT 380, Dell EMC Unity XT 380F, Dell EMC Unity 400, Dell EMC Unity 400F, Dell EMC Unity 450F, Dell EMC Unity XT 480, Dell EMC Unity XT 480F, Dell EMC Unity 500, Dell EMC Unity 550F
, Dell EMC Unity 600, Dell EMC Unity 600F, Dell EMC Unity 650F, Dell EMC Unity XT 680, Dell EMC Unity XT 680F, Dell EMC Unity XT 880, Dell EMC Unity XT 880F, Dell EMC Unity Family |Dell EMC Unity All Flash, Dell EMC Unity Family, Dell EMC Unity Hybrid, Dell EMC UnityVSA Professional Edition/Unity Cloud Edition
...
Article Properties
Article Number: 000063277
Article Type: Solution
Last Modified: 20 Oct 2025
Version: 5
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