You cannot resize a disk while it is serving as a quorum disk, so a few special steps are required when using SnapDrive for Windows to resize a quorum disk in a Microsoft cluster.
If you decide to create a new LUN and designate that disk as a quorum, you can simply create a new disk, designate it as the quorum using the Cluster Administrator on the owning node of your Windows cluster, and then delete the original quorum disk. Otherwise, follow this procedure to keep the original quorum disk and resize it.
For information about how to set a disk as a quorum, see your Windows documentation.