(vCenter Alarm) Bitmap Mode 'On' Duration Exceeded

Alarm

Prolonged bitmap mode Duration alert highlights that respective domain(s) cannot keep up with replication.

i.e. A percentage of operating data cannot efficiently reach the DRVA, thus causing the newly written data to be captured by the IO Filter as “bitmaps”, to replicate at a later point in time.

Open

Example: Alarm reported in vCenter.

Open

Example: Alarm definition in vCenter.

Cause-

• When a large VM is added to the domain and its initial sync takes substantial time.

• Inefficient data transfer between the DRVA and object store.

                 ---> A network disruption between the DRVA and the object store.

                 ---> The replication log is full and cannot be written to.

Resolution:

In cases when this alert is raised and there are VMs in initial sync mode, please monitor the amount of bitmap currently required to be replicated for all disks on the domain. While this amount decreases, this alert can be ignored.

If the issue persists -->

1. Verify the DRVA is up and running.

2. Validate the replication status of the VM/protected domain.

3. Navigate to the Statistics tab:

   • Select the protected domain exhibiting the problem.

   • Examine the Replication graph to identify any performance issues with replication speed.

4. Ensure there are no connectivity issues between the DRVA and the object store.

5. Ensure there are no errors with the DRVA or replication log.

6. Check communication between the IO filter and DRVA.