If you want to change the Quorum disk in your cluster and you are afraid to get downtime or lost connectivity you don’t have to afraid. In windows server 2012R2 you can drive and change the tire.
In the failover cluster manager (FCM) right click the cluster and under more actions you can set the cluster quorum.
In the next screen you can do the default/select/advanced config.
I choose the advanced , This is a fresh Cluster and currently there is only one node.
But you can make a selection of the nodes that can vote, So if you have a node that is less important and or you don’t want to have the vote you can un select them. And you can find this easily in the nodes assigned vote
This step you can create a fileserver witness or a disk witness. Remember when creating your cluster and all disk are presented to the cluster the smallest disk is auto assign to be the witness disk. unless there is only one disk then this disk is used as quorum even if this disk is several TB.
I can choose between two disk and I select the 500MB disk after this the cluster is quorum ready.
as you can see in the disks the Quorum is configured.
and yes all these steps can be don in PowerShell
Set-ClusterQuorum –Cluster Left01 -NodeAndDiskMajority "Cluster Disk 2"
but now for changing the quorum ? yes the same steps are needed
but in the disk selection there is already a disk selected and you can’t use two disks so flip the check box for the other disk and you are ready to go.
Set-ClusterQuorum –Cluster Left01 -NodeAndDiskMajority "Cluster Disk 3"
So now downtime no reboots and flip it back to disk 2 easy
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10 thoughts on “Changing Quorum disk in Windows server 2012R2 No downtime #winserv #iscsi”
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Should I shut down all my VMs first if I’m moving the Quorum drive to another space? Or can this be done on a live system?
changing quorum has no impact on the cluster load.
Can I change size (Increasing) of quorum disk? How? I need to increase it because is running out of space. Thanks.
yes you can but the quorum disk shouk hold only the quorum and is just a file, did you use this disk also for storing other files. this is not the best option.
better use a file witness to another server to make sure the quorum is up. changing this is easy and will not cause any downtime
Will the quorum disk is required to keep the same node for resource role (eg. sql server)?
Hi The Quorum disk is not used for holding roles on to the specific node. de quorum disk is used to hold the cluster configuration in case it needs majority say 2 node cluster one goes down with the quorum disk the cluster keeps running, if there is no quorum disk the cluster could face split brain running 2 nodes but with a broken config. https://docs.microsoft.com/en-us/windows-server/failover-clustering/manage-cluster-quorum
There is no cluster downtime if you change the quorum. also all the resources will keep running.