vSphere Microsoft clustering - RDM & VMDK shared disk option for WSFC
There are multiple improvements from clustering techniques available to Customers from vSphere 7 and up, giving different options and simplifying actions so that high availability requirements are satisfied. Before v7 you can only rely on different pRDM (physical RDM) options or vVols (VMware vSphere Virtual Volumes), starting with clustered VMDK support on vSAN 6.7 U3. Starting with vSphere v7.x there is support for Windows Server Failover Cluster (WSFC) with shared disk VMDK based resources by transparently passing to the underlying storage or emulating on the datastore level SCSI-3 Persistent Reservations (SCSI3-PRs) SCSI commands, required for a WSFC node (VM participating in a WSFC) to arbitrate access to a shared disk. In summary, from the storage perspective next table is showing current options for sharing purposes in WSFC cluster environments - pay attention that only FC based storage, for clustered VMDK based disk, is supported a...