Types of Cables

Types of Cables:

Drives connect to the 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 the server:

A four-wire power cable connects to each drive.
A flat-ribbon signal cable connects to IDE devices.
- One flat-ribbon cable connects the internal diskette drive.
  The connector on one end of this cable attaches to the system board. The primary diskette drive installed in the server (usually known as drive A) is attached to the connector on the other end of this cable.
  NOTE: The primary diskette drive must always be attached to the drive connector on the end of this cable.
- A second flat-ribbon cable connects the CD-ROM drive.
  This cable has two drive connectors. A third connector attaches to the system board. The CD-ROM drive that comes with the server is attached to the connector on the end of this cable.
Another cable connects internal SCSI devices. This SCSI cable has two connectors that connect to SCSI devices:
- One to the backplane of the DASD hot-swap enclosure
- One to a SCSI device you install in the open 5.25-inch bay
A third connector attaches to the SCSI connector on the system board.

External SCSI devices usually come with a SCSI cable. You attach one end of this SCSI cable to the SCSI connector on the back of the server, and the other end to the SCSI device. You usually can attach additional SCSI devices to this cable.

SCSI Devices: The Netfinity 5000 supports drives that comply with American National Standards Institute (ANSI) SCSI Standards X3.131-1986 (SCSI), X3.131-1994, (SCSI-2), X3.277-1996 (SCSI-3 Fast-20 parallel interface), and X3.253-1995 (SCSI-3 parallel interface).

For a complete list of the SCSI devices supported on the Netfinity 5000, go to

http://www.pc.ibm.com/support/ on the World Wide Web.

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.

NOTE: Any information about SCSI drives also applies to other SCSI devices, such as scanners and printers.

SCSI IDs: If you install SCSI devices, you must set a unique identification (ID) for each SCSI device that you connect to the server. This enables the SCSI controller to identify the devices and ensure that different devices do not attempt to transfer data at the same time.

The SCSI controller in the server supports SCSI IDs 0 to 15, ID 7 is reserved for the controller, ID 14 is reserved for the daughterboard (SAF-TE) on the DASD backplane.
Use the SCSISelect Utility program to view the SCSI IDs of SCSI devices in the server. (See 'Using the SCSISelect Utility Program' for more information.)

NOTE: A daughterboard is a secondary adapter that can be plugged into another adapter or the system board. The SAF-TE daughterboard on the DASD backplane makes available the status information about the DASD drives that meet the following conditions:

The drives are part of a RAID environment
The status information comes from a supported IBM RAID adapter

If you install wide (16-bit) SCSI devices, you can set the IDs to any whole number between 0 and 6, or to any whole number between 8 and 13, or to 15. If you install narrow (8-bit) SCSI devices, you can set the IDs to any whole number between 0 and 6.

The server automatically sets SCSI IDs for hot-swap hard disk drives, according to the jumper settings on the DASD backplane. The server uses the hard disk drive SCSI IDs to send status information to the indicator lights on each hard disk drive. See 'Front Panel Indicators' for the location and identification of the hard disk drive status lights.

Table 2 shows the default SCSI IDs that the backplane assigns for hot-swap hard disk drives.

Table 2. Automatically Assigned SCSI IDs

Bay 1 2 3 4 5 ID 0 1 2 3 4

Bay	1	2	3	4	5
ID	0	1	2	3	4

You can change the default ID addresses of the drives by changing the jumper settings on the DASD backplane. See 'SCSI Jumpers'.

Termination Requirements: The UltraSCSI controller and the backplane of the hot-swap bays provide termination for the internal SCSI bus (cable) in the server.
There are no termination requirements for any SCSI devices you install in the hard disk drive bays or attach to this cable.

If you attach a SCSI cable and devices to the external SCSI connector, set the termination for the last device on that SCSI cable to Enabled. Refer to the instructions that come with the SCSI device for more information about termination.

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