Adaptec 5405Z User's Guide download pdf (Page 71)

Appendix A: Introduction to SAS ● 71

How are Disk Drives Identified in SAS?

In the BIOS and in the management utilities (see Identifying Disk Drives on page 92), disk

drives are identified in the following formats:

● CNX:DevY = Device Y is attached to Connector X (see Direct-attach Connections below for

more information)

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

below for more information)

● ExpX:PhyX = Expander X is attached to Phy X (see SAS Expander Connections below 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 page 72), you can

create large configurations.

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 figure on page 39 shows an example of direct-attach connections.

The number of direct-attached disk drives is limited to the number of phys supported by the

SAS card. (Note that there may be multiple phys within a single connector. See page 72.)

Backplane Connections

In a backplane connection, disk drives and SAS cards are attached to and communicate with

each other through a system backplane.

There are two types of backplane connections, passive and active. When connecting to either

backplane, it’s important to properly connect your disk drive LEDs in order to identify disk

drive conditions. See About Your RAID Controller on page 15 for your RAID controller Activity

LED connections and locations.

Once you have connected to a backplane, use Adaptec Storage Manager to manage your disk

drives. For more information, refer to the Adaptec Storage Manager User’s Guide on the RAID

Controller Installation DVD.

.The number of end devices is limited to the number of slots available on the backplane. For

example, the Adaptec S50 enclosure, which contains an expander, is a backplane connection

that supports up to 12 SAS or SATA disk drives.

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Adaptec 5405Z User's Guide Page 71