HP Windows Server 2012 Cluster Pre-Planning Guide

Cluster Shared Volumes
Clustering shared volumes allows multiple cluster nodes to access a LUN simultaneously. In this
case, Microsoft Failover Clustering requires each cluster node to register each logical path to the
LUN. Each cluster node uses a unique key to register its paths. For example, if there are four cluster
nodes with two logical paths each, eight keys are registered for that LUN. Microsoft Failover
Clustering uses the persistent reservation type of “Write Exclusive – Registrants Only”, so any cluster
node and associated path that is registered will be able to read and write to the LUN.
Figure 3 Cluster Shared Volume
Cluster Shared Volumes 7