Installing An External Scsi Connector - IBM 84885BU Maintenance And Troubleshooting Manual

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,

Installing an external SCSI connector

To install an external SCSI connector on the rear of the server, install an external
SCSI interface option. For a list of supported external SCSI interface options for the
server, go to http://www.ibm.com/pc/compat/.
The external SCSI interface option contains a SCSI cable with a connector at one
end and another connector on the other end. Complete the following steps to install
and route the SCSI cable in the server:
At the end of these cables are plastic connectors that can be attached to
different drives; these connectors vary in size. Use either a four-wire power cable
or Serial ATA power cable with Serial ATA drives, but do not use both at the
same time (use one or the other). For SCSI hot-swap drives, a special power
cable connects the SCSI backplane to the power supply.
that connect parallel IDE, Serial ATA, SCSI, and diskette drives to the system
board. Two or three types of signal cables come with the 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 IDE connector on the system board. The spare connector can be
used to connect an additional IDE drive to the 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 connected to the connector
(FDD1) on the system board.
– Serial ATA (SATA): The narrower, black signal cable has two connectors. One
is connected to a simple-swap Serial ATA drive, and the other is attached to
the connector on the system board. Each simple-swap Serial ATA drive comes
with a cable. If you install an additional simple-swap Serial ATA drive, you will
need an additional cable.
If you install the optional ServeRAID-7t S-ATA controller to add a third and
fourth SATA drive, all four SATA drives must then be connected to the
ServeRAID-7t S-ATA controller instead of the system board. The optional
ServeRAID-7t S-ATA controller comes with two cables that you can use to
cable the third and fourth SATA drives. See the optional ServeRAID-7t S-ATA
controller documentation for cabling instructions.
– SCSI: A round SCSI cable connects the SCSI backplane to the SCSI channel
B connector on the system board. The maximum cable length that supports
Ultra320 SCSI hard disk drives is 61 cm (24 in.).
1. Turn off the server and all peripheral devices. Disconnect all power cords;
then, disconnect all external signal cables from the server.
2. Remove the server cover (see "Removing the side cover" on page 28).
3. Remove the support bracket (see "Removing and installing the support
bracket" on page 32).
Chapter 4. Customer replacement units
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