Adaptec ASR-6405E Guide de l'utilisateur Page 84

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Appendix A: Introduction to SAS 84
How are Disk Drives Identified in SAS?
In the BIOS and in the management utilities (see Identifying Disk Drives on page 105), 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 85), 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 47 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 85.)
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, its important to properly connect your disk drive LEDs in order to identify disk
drive conditions. See About Your RAID Controller on page 17 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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