HP 418800-B21 Redundancy in enterprise storage networks using dual domain SAS - Page 7

HP dual-path with cascaded JBODs The dual-path approach can prevent a single point of failure occurring in complex enterprise configurations such as cascaded JBODS. The configuration is supported for both SAS and SATA drives. In this configuration a controller is connected to the IO module at each end of a set of cascaded JBODS. Each JBOD contains a single expander, as shown in Figure 5.This configuration, which uses half of the IO modules and expanders required for other redundant storage, also reduces costs. Figure 5. Dual-path scenario for cascaded JBODS 4 Server Controller 4 IO Module Expander Disk drive Disk drive Disk drive JBOD IO Module Expander Disk drive Disk drive Disk drive JBOD IO Module Expander Disk drive Disk drive Disk drive JBOD 7