Use anti-affinity in Failover Clustering

Use anti-affinity in Failover Clustering

How to properly configure anti-affinity in a Failover Cluster.

Q. How do I configure anti-affinity in my Failover Cluster?

A. Anti-affinity enables a collection to be created which contains VMs that the cluster will attempt to keep on separate nodes. This is important when you have multiple instances of a service running in a cluster and want to ensure they are distributed over multiple nodes to ensure service availability even if a node fails. In the example below I add 3 VMs to an anti-affinity group which will then ensure where possible they will each run on different nodes in the cluster.

Get-ClusterGroup | Select AntiAffinityClassNames

$ATAAntiAffinity = New-Object System.Collections.Specialized.StringCollection
$ATAAntiAffinity.Add("ATA Gateway")

(Get-ClusterGroup -Name infra-atagw1).AntiAffinityClassNames = $ATAAntiAffinity
(Get-ClusterGroup -Name infra-atagw2).AntiAffinityClassNames = $ATAAntiAffinity
(Get-ClusterGroup -Name infra-atagw3).AntiAffinityClassNames = $ATAAntiAffinity


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