IBM PC Server 325, User Handbook Manual

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Working with Internal Drives
Your server supports drives that conform to the small computer
system interface (SCSI). This design allows you to attach multiple
drives to a single SCSI connector.
Note: Any information about SCSI drives also applies to other SCSI
devices, such as scanners and printers.
If you install additional SCSI devices, you must set a unique
identification (ID) for each SCSI device. This enables the SCSI
controller to identify the devices and ensure that different devices
do not attempt to transfer data at the same time.
Drives connect to your server with cables. Each cable connector is
designed to fit a corresponding connector on a drive.
Three types of internal cables connect to the drives in your server:
Ÿ A four-wire power cable connects to each drive. The server has
three two-drop drive power cables. One drive power cable
provides two types of power connectors: one connector is for
the installed diskette drive; the other connector can connect to a
SCSI device such as a hard disk drive.
Note: Some models come with a supplemental two-drop drive
power cable. You must attach this cable to a connector
on a drive power cable when you fully populate the drive
bays.
Ÿ
A flat-ribbon signal cable connects the internal diskette drive.
This cable has three drive connectors. A fourth connector
attaches to the system board. The primary diskette drive
installed in your server (usually known as drive A) is attached
to the connector on the end of this cable.
Note: The primary diskette drive must always be attached to
the drive connector on the end of this cable.
Ÿ
Another cable connects internal SCSI devices. This SCSI cable
has seven connectors that connect to SCSI devices. An eighth
connector attaches to the SCSI connector on the system board.
Chapter 3. Installing Options
79