HP 3PAR StoreServ Cluster Extension Software Administrator Guide

Figure 10 HP 3PAR StoreServ Cluster Extension 3DC solution
In this configuration, the Microsoft Failover Cluster is created and CLX is configured between the
nodes in the primary and secondary data centers. During a disaster event in the primary datacenter,
CLX automatically detects that the configuration is in 3DC environment and performs the required
failover or failback operation between the primary and secondary data centers. After failover or
failback, CLX automatically starts and syncs the RC group from the current primary datacenter to
the remote data center (third datacenter). This behavior depends on the Auto sync data to
third DC value configured for the CLX resource. For information on configuring this value see
“Changing Remote Copy volume group settings” (page 41).
In the 3DC environment, the Microsoft Failover Cluster can also be created among the nodes
spanning all the three data centers. CLX supports Failover or Failback between two data centers
that are connected using a remote copy link in synchronous replication mode. Hence, CLX must
be installed and configured in the cluster nodes that exist in primary and secondary data centers.
For more information, see HP 3PAR StoreServ Cluster Extension solution for HP 3PAR StoreServ
3DC environment white paper.
HP 3PAR 3DC (3 Datacenter) environment 83