HP 418800-B21 Redundancy in enterprise storage networks using dual domain SAS - Page 3

archival, reference, and redundant highly-available applications. They are intended for use in an environment where the drive workload is 40 percent or less. Single SAS domain There are many single points of failure in a single domain. Failure can originate from any controller, expander device, JBOD or cable, as shown in Figure 1. NOTE: JBOD is the acronym for "Just a Bunch of Disks." It refers to a group of hard disks, usually in an enclosure, that may or may not be RAID configured. Figure 1. Single domain SAS storage network Server Controller 4 IO Module Expander NOTE: All figures in this technical brief using the "4 " notation indicate a 4-lane bundled path. There are 4 wires per lane, or 16 total wires in a 4x cable. Disk drive Disk drive Disk drive JBOD 3