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

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Explanation of Bitmap On Frequency and Back Pressure On Frequency

Bitmap On Frequency

The percentage of operating time that data could not efficiently reach the DRVA, so newly written data was captured by the IO filters in bitmaps for later replication.

Bitmap mode warning: This alarm will be triggered if a domain stays in bitmap mode for a 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.

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Cause of

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Network disruption between DRVA and the object store.

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Backpressure

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

Bitmap

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"Bitmap On Frequency

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The " is measured as the percentage of operating time the application writes operations were slowed to accommodate data replication.BackPressure alarm: This alarm will be triggered if the application write backPressure has been applied for data could not efficiently reach the DRVA causing newly written data to be captured by the IOFilters in bitmaps for 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. 

Cause of

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Bitmap Mode

• Bitmap mode occurs when:

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

  • When the

  Replication incoming data rate is more than the outgoing

  • replication log is full and cannot be written to.