Adaptec SAS RAID Controllers Guia de Instalação descarregar pdf (Página 125)

Appendix G Introduction to Serial Attached SCSI 111

This table describes many of the main differences between the two interfaces.

TABLE G-1 Differences Between Parallel SCSI and SAS

Parallel SCSI Serial Attached SCSI

Parallel interface Serial interface

Maximum speed 320 MB/sec shared by

all devices on the bus

Maximum speed 300 MB/sec per phy when in

half-duplex mode

Supports SCSI devices only Supports SATA and SAS disk drives

simultaneously

Up to 16 devices per SCSI channel

More than 100 disk drives per SAS card, using

an expander (see

“SAS Expander Connections”

on page 109

)

or 50 SATAII disk drives.

Supports single-port devices only Supports single- and dual-port devices

Uses SCSI IDs to differentiate between

devices connected to the same adapter

Uses unique SAS addresses to differentiate

between devices

User intervention required to set SCSI

IDs

SAS addresses self-configured by SAS devices

Requires bus termination Requires no bus termination

Standard SCSI connectors SAS connectors (see “HBA Features” on

page 2)

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