HP 418800-B21 Redundancy in enterprise storage networks using dual domain SAS - Page 6

Dual-domain SAS: servers in two-node cluster This configuration, which is also known as a high availability (HA) cluster, at least one server must have access to the storage network. The cluster interconnect provides redundancy in the event of host bus adapter (HBA) or cable failure, as shown in Figure 4. Dual-domain SAS requires "active/active" configurations. The "active/active" configurations permit both controllers to process I/Os, and either controller can act as a standby. To use the dual-ports for redundant pathways, all drives must be SAS. Figure 4. Multi-Path, 2-Node, HA cluster configuration Server HBA Cluster interconnect Server HBA 4 4 4 4 IO Module Expander IO Module Expander SAS drive SAS drive SAS drive JBOD 6