Operating System Software User Manual

Figure 41 Quorum Witness Update and Status Messaging
HP 3PAR Peer Persistence
HP 3PAR Peer Persistence enables the transparent migration of applications from one HP 3PAR
StoreServ to another, maintaining business continuity for virtualized data centers. In the event of
a failure in the source storage system, host traffic is redirected to the secondary storage system
transparently and without major impact to the hosts. Peer persistence ensures that key applications
are unaffected by:
• Non-disruptive vMotion support across sites
• VMware virtual machine failure
• Storage system failure
• Site failure
The HP 3PAR Quorum Witness becomes relevant only during an HP 3PAR Peer Persistence failover.
Figure 42 Peer Persistence with Synchronous Remote Copy
HP 3PAR Peer Persistence enables, without any disruption to applications, the following:
• Load balancing across data centers with vMotion.
• High availability of VMware environments across data centers.
134 HP 3PAR Peer Persistence with Transparent Failover