Power And Signal Cables For Internal Drives - IBM xSeries 225 8647 Installation Manual

14. If you have other options to install or remove, do so now.
15. Replace the support bracket (see "Removing and installing the support
16. Replace the bezel (see "Replacing the bezel" on page 39).
17. Replace the side cover (see "Replacing the bezel" on page 39).
18. Reconnect the external cables and power cords; then, turn on the attached

Power and signal cables for internal drives

Your server uses cables to connect IDE and SCSI devices to the power supply and
to the system board. (See "System-board internal connectors" on page 3 for the
location of system-board connectors.) Review the following information before
connecting power and signal cables to internal drives:
v The drives that are preinstalled in your server come with power and signal cables
v When you install a drive, ensure that one of the drive connectors of the signal
v The server has two IDE buses, primary and secondary. Each of these buses
v If you have only one IDE device on a cable, it must be set as a master device.
v If two IDE devices are used on a single cable, one must be designated as the
The following cables are provided:
v Power cables: Four-wire power cables connect the drives to the power supply.
v Signal cables: Signal cables are typically flat cables, also called ribbon cables,
bracket" on page 12).
devices and the server.
attached. If you replace any drives, remember which cable is attached to which
drive.
cable is connected to the drive and that the connector at the other end of the
signal cable is connected to the system board.
supports up to two IDE devices. The primary IDE bus uses connector IDE1 on
the system board and the secondary IDE bus uses connector IDE2.
master device and the other as the subordinate device; otherwise, the server
might not recognize some of the IDE devices. The master and subordinate
designation is determined by switch or jumper settings on each IDE device.
At the end of these cables are plastic connectors that can be attached to
different drives; these connectors vary in size.
that connect IDE, SCSI, and diskette drives to the system board. Two or three
types of signal cable come with your server.
– IDE: The wider IDE signal cable has three connectors. One of these
connectors is attached to the drive, one is a spare, and the third is attached to
the primary or secondary IDE connector on the system board. The spare
connector can be used to connect an additional IDE drive to your server.
The CD-ROM drive is attached to an ATA 100 signal cable. ATA 100 signal
cables are color-coded. The blue connector is attached to the system board.
The black connector is attached to the master IDE device. The gray middle
connector is attached to the subordinate IDE device.
– Diskette drive: The narrower signal cable has two connectors. One is
attached to the diskette drive, and the other is attached to the connector
(FDD1) on the system board.
– SCSI: A round SCSI cable connects SCSI devices to the integrated SCSI
controller with RAID capabilities on the system board. For hot-swap models,
the maximum cable length that supports Ultra320 SCSI hard disk drives is 16
inches. For more information about connecting SCSI devices, see the SCSI
documentation.
Chapter 2. Installing options
27