Subnet thresholds for clusters in Azure

Subnet thresholds for clusters in Azure

How to tune hearthbeat thresholds to optimize resiliency for Azure failover clusters.

Q. If I run a cluster in Azure what should I configure the subnet thresholds to?

A. With the nature of Azure and the distribution of workloads, it is possible for some intermittent network interruptions that will quickly self-heal however the default thresholds for cluster communications may result in premature failovers. It is therefore recommended to increase the SameSubnetThreshold and CrossSubnetThreshold values to 10 and even potentially 20 for increased tolerance for clusters running in Azure. These can be set using:

(Get-Cluster).SameSubnetThreshold = 10
(Get-Cluster).CrossSubnetThreshold = 10

 

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