HP 418800-B21 Redundancy in enterprise storage networks using dual domain SAS - Page 4

Dual-domain SAS Using dual-ported drives and dual controllers, or a controller capable of supporting dual domains, provides dual-path redundancy from the server. Figure 2 shows an example of a single controller capable of dual-domain support. The dual-domain SAS configuration in Figure 2 can tolerate simultaneous single port failure in a dual-port, dual-domain capable controller, external cable failure, and expander failure. Figure 2. SAS dual-domain SAS to JBOD storage network Server 4 Controller 4 IO Module Expander IO Module Expander SAS drive SAS drive SAS drive JBOD NOTE: Currently, the P800 controller provides dual-domain support For additional information on Serial technology and how it makes dual-domain SAS possible, see "Enabling technology" in Appendix B. 4