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Serial Attached SCSI technologies and architectures
Technology brief, 4th edition
Introduction ......................................................................................................................................... 2
SAS devices ........................................................................................................................................ 2
Initiators .......................................................................................................................................... 2
Expanders ....................................................................................................................................... 3
Targets ........................................................................................................................................... 3
SAS protocol ....................................................................................................................................... 3
Active cables ................................................................................................................................... 3
Storage power management ............................................................................................................. 4
Differential signaling ........................................................................................................................ 4
SAS/SATA interoperability ................................................................................................................... 5
SAS topologies .................................................................................................................................... 5
Internal ........................................................................................................................................... 6
External .......................................................................................................................................... 7
Multi-node clusters ............................................................................................................................ 8
Dual-path and dual-domain architectures ............................................................................................ 8
Dual-path with cascaded JBODs ..................................................................................................... 8
Dual-domain SAS ......................................................................................................................... 9
Zoning ............................................................................................................................................. 12
Zone management ......................................................................................................................... 13
Zoning advantages in an HP environment ......................................................................................... 14
Zoning example ............................................................................................................................. 15
Cabling and connectors technology ..................................................................................................... 16
SAS drive performance ...................................................................................................................... 18
Conclusion ........................................................................................................................................ 18
Appendix: SAS terminology ................................................................................................................ 20
For more information .......................................................................................................................... 21
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