Extending Shared Cluster Disk- Windows Cluster

We are in need of expanding our current quorum disk size by about 500GB. The disk is currently shared by 2VMs which are on 2 different ESXI hosts and connected to our iSCSI SAN via physical compatibility mode in vmware for our SQL databases using Failover Cluster manager, server 2012.

Question do I have to do anything with shutting off cluster services or with quorum disk witness disk before I extend the disk space on the active node?

Thanks for any suggestions/tips!