Adaptec 6405 Guia do Utilizador descarregar pdf (Página 71)

What’s a SAS Connector?

A SAS or mini-SAS connector is the physical plug or receptacle that you see on a SAS device. It’s what

you plug a SAS cable into, or the end of the SAS cable that’s being plugged in. (See Cables on page 31.)

A connector is what forms physical links between phys. Some SAS connectors can support multiple links.

The number of links a SAS connector can support is referred to as its width. Narrow connectors support

a single link; wide connectors supports more than 1 link.

A single SAS device may have one or more connectors. A single SAS connector may help form links

between more than two SAS devices. (For instance, as shown in the gure in Connecting Drives Directly

to the Controller on page 41, the 4-wide internal SAS connector forms links with four independent disk

drives.)

What do SAS Cables Look Like?

Internal standard SAS cables are narrower than internal parallel SCSI cables. The connectors vary in size

depending on the number of links they support, from single link connectors to 4-wide (or larger)

connectors. Internal fan-out cables let you attach four disk drives to a single 4-wide connector.

Mini-SAS connectors support both internal and external SAS connections. The mini-SAS connectors are

smaller than the standard SAS internal and external connectors. Mini-SAS connectors support single

and multilinks with the ability to scale to future speed needs.

For examples of some internal SAS/mini-SAS cables and an external SAS/mini-SAS cables, see Cables on

page 31.

How are Disk Drives Identied in SAS?

In the BIOS and in the management utilities (see Identifying Disk Drives on page 90), disk drives are

identied in the following formats:

• CNX:DevY = Device Y is attached to Connector X (see Direct-attach Connections on page 71 for more

information)

• BoxX:SlotX = Enclosure X is attached to a disk drive in Slot X (see Backplane Connections on page

72 for more information)

• ExpX:PhyX = Expander X is attached to Phy X (see SAS Expander Connections on page 72 for more

information)

where X is the count number.

Note: Devices other than disk drives (CDROM, tape drives, etc...) are listed in order

after your system disk drives.

In parallel SCSI, XX is the disk drive’s channel number, YY is the target number, and ZZ is the logical unit

number (LUN).

What are the SAS Connection Options?

You can connect end devices to each other through direct cable connections and through backplane

connections. When you use one or more expander devices (see SAS Expander Connections on page 72),

you can create large congurations.

Direct-attach Connections

In a direct-attach connection, SAS or SATA disk drives are connected directly to a SAS card with SAS or

mini-SAS cables. One disk drive is attached to one SAS/mini-SAS connector with one SAS/mini-SAS cable

(or multiple disk drives are attached to one SAS/mini-SAS connector with one fan-out cable). The gure

in Connecting Drives Directly to the Controller on page 41 shows an example of direct-attach connections.

71Proprietary and Condential to PMC-Sierra, Inc.

Document No.: CDP-00277-02-A Rev. A, Issue:

Serial Attached SCSI RAID Controllers Installation and User's Guide

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