Serial Attached SCSI (SAS) Interface
1.1 Topologies in SAS Interface
As shown in Figure 1.1, SAS drives have two connection patterns: point-to-
point connection and expander connection.
SAS supports the three protocols listed below. Among these protocols, SAS
drives support only SSP.
•
Serial SCSI Protocol (SSP)
•
Serial ATA Tunneling Protocol (STP)
•
Serial Management Protocol (SMP)
1-2
SAS HBA (INIT)
SAS
SAS
Drive
Drive
SSP (Serial SCSI Protocol)
SAS HBAs (INIT)
SMP
SAS Expander (s)
SSP
SSP
SAS
Drive
Figure 1.1 SAS drive connection patterns
SAS
SATA
Drive
Drive
STP
SAS
SATA
Drive
Drive
C141-C009