This article applies to ( all JSDR software versions )
\uD83E\uDD14 Problem
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Alarm
JetStream DR manages VM replication performance by adjusting its operations to accommodate varying network conditions. By understanding and addressing the causes of backpressure, administrators can ensure smoother replication and minimize disruptions/performance impact to protected VMs.
💡 Cause
Backpressure occurs . This alarm is triggered when “backpressure” is applied to throttle replication network traffic of a protected domain.
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| Note |
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This alarm is informational only and does not require specific corrective action from the user. |
Possible Cause
Backpressure is used when the rate of incoming data from protected VMs exceeds the available outgoing network bandwidth to the destination site. This can lead to the replication log filling up or delays in processing the incoming data.JetStream DR triggers this alert when Backpressure is applied.
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If the incoming data exceeds the outgoing bandwidth,
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JetStream DR uses
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a replication log to temporarily
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cache data for replication at a later point in time after network traffic (i.e., caused by a spike in VM usage) decreases.
If the incoming data
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remains excessively high or the replication log
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hits capacity, JetStream DR applies backpressure to slow down incoming data
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to prevent overloading the replication log
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and
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maintain manageable data rates for reliable operation.
If
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backpressure limits are exceeded,
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JetStream DR switches to network bitmap protocol mode. This
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allows protected
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VMs to continue
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operation by reducing the load on the outgoing replication.
JetStream DR will periodically
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exit network bitmap protocol mode to check network performance condtions and
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will return to regular replication if
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possible.
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Resolution
Best practices should be used to optimize replication traffic performance and avoid the use of backpressure or bitmap protocol mode.
Use CPT to optimize the configuration of protected VMs and system resources.
Enhance replication network performance.
Increase the size of the replication log.