HP EVA Cluster Extension Software Administrator Guide (5697-2445, July 2013)

NOTE: For complete information on which write modes are supported on each version of
controller software, see the HP Enterprise Virtual Array Compatibility Reference.
• EVA Cluster Extension supports EVA Continuous Access in synchronous replication mode and
enhanced asynchronous replication mode in the following configurations:
◦ Switched FC connection (dual-fabric intersite links)
◦ FC to DWDM networks, via FC switches
◦ FC over IP networks, via FC switches as shown in the HP EVA Continuous Access
Implementation Guide
• The EVA Continuous Access links must have redundant, separately routed links for each fabric.
The cluster network must have redundant, separately routed links. However, cluster networks
and EVA Continuous Access can share the same links if the link technology is protocol
independent (for example, WDM) or if the FC protocol is transformed into IP.
Figure 2 One-to-one configuration
Consolidated DR site configuration
EVA Cluster Extension supports configurations that have a single EVA storage system in the disaster
recovery data center and up to two source EVA storage systems (the logical configuration must be
a one-to-one configuration as shown in Figure 2 (page 9)).
NOTE: The restrictions outlined in One-to-one configuration (page 8) also apply to consolidated
configurations.
Storage system configurations 9