Rejoin quarantined fail-over cluster nodes
If you ever encounter a flapping fail-over cluster you might end up with one or more quarantined cluster nodes.
Quarantined nodes are drained from their roles and are not allowed to rejoin the cluster for a set amount. You can find out the duration and threshold using this command:
Get-Cluster | Format-List -Property Quarantine*In practise though, you might find your fail-over cluster with quarantined nodes outside of these boundaries.
You can use the following Powershell script to find quarantined nodes and rejoin them.
Write-Host "Find quarantined nodes: " -NoNewline
$QuarantinedClusterNodes = Get-ClusterNode | Where-Object StatusInformation -eq Quarantined
if($QuarantinedClusterNodes){
Write-Host $QuarantinedClusterNodes.count
foreach($QuarantinedClusterNode in $QuarantinedClusterNodes){
Write-Host "@($QuarantinedClusterNode.Name)"
Write-Host "Stopping cluster node: " -NoNewline
$QuarantinedClusterNode | Stop-ClusterNode
Write-Host "V"
Write-Host "Clear quarantine and start cluster node" -NoNewline
$QuarantinedClusterNode | Start-ClusterNode -ClearQuarantine
Write-Host "V"
}
} else {
Write-Host "No quarantined nodes found"
}