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Alarms are sent by the MSA when the below condition is hit. 

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Let's understand what is Bitmap On Frequency and Back Pressure On Frequency.

Bitmap On Frequency: The percentage of operating time that if either of the following conditions occur:

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Backpressure

"Backpressure On Frequency" is measured as the percentage of operating time application write operations were slowed to accommodate data replication.

Backpressure Alarm

• An alarm notification will be triggered if application write Backpressure has been applied for a period exceeding 5 consecutive minutes.

Cause of Backpressure

• Backpressure occurs when the replication incoming data rate exceeds the outgoing data rate.

Bitmap

"Bitmap On Frequency" is measured as the percentage of operating time data could not efficiently reach the DRVA , so causing newly written data was to be captured by the IO filters IOFilters in bitmaps for later replication.

Cause of the alarm:

• Network disruption between DRVA and the object store.

• When the Replication Log is fully occupied and no space left. 

Note: From the vCenter level check the DRVA Network Statistics.

Bitmap mode warning: If a domain has to stay replication at a later point in time.

Bitmap Alarm

• An alarm notification will be triggered if a domain stays in bitmap mode for a period exceeding 5 consecutive minutes

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• When the Replication incoming data rate is more than the outgoing.

Note: The Network Statistics of a Protected VM and DRVA can be verified From the vCenter level to isolate the issue.

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Cause of Bitmap Mode

• Bitmap mode occurs when:

  • There is a network disruption between the DRVA and the object store.

  • When the replication log is full and cannot be written to.