IBM XSERIES 220 manual Scsi port, Scsi cabling requirements

Pin	Signal	Pin	Signal	Pin	Signal
4	Not connected	9	PIN	14	Vertical synchronization
					(Vsync)
5	Digital return	10	Digital return	15	DDC SCL

Table 14. Video-port connector pin-number assignments.

SCSI port

The server has an integrated small computer system interface (SCSI) controller with an internal connector (J41) on the system board. This controller supports an Ultra160 SCSI internal channel. This channel supports up to 15 SCSI devices. In addition, this controller uses:

•Double-transition clocking to achieve high transfer rates

•Domain name validation to negotiate compatible data transfer speeds with each device

•Cyclic-redundancy checking (CRC), instead of the usual parity checking, to significantly improve data reliability

•An active terminator on the system board for SCSI bus termination

If you install a SCSI adapter in the server, you can use its SCSI connector to connect different types of small computer system interface (SCSI) devices.

Note: If you install a PCI redundant array of independent disks (RAID) adapter, you can move the SCSI cable from the system-board SCSI connector to an internal channel connector on the RAID adapter if you want to control the internal drives from the adapter.

SCSI cabling requirements

A SCSI cable comes with the server so that you can connect internal SCSI devices to the SCSI controller on the system board. A 2-drop SCSI cable comes with the models that have the hot-swap drive cage option. A 5-drop SCSI cable comes with the models that have the standard non-hot-swap drive cage. If you plan to use the SCSI cable to connect internal SCSI devices to another SCSI or ServeRAID controller (for example, an optional PCI adapter), you must purchase and install an optional SCSI cable to connect other SCSI devices (for example, a tape drive) to the SCSI connector on the system board. If you plan to attach external SCSI devices, you must install an optional SCSI adapter and order additional SCSI cables.

For information about the maximum length of SCSI cable between the terminated ends of the cable, refer to the ANSI SCSI standards. Adhering to these standards will help ensure that the server operates properly.

Setting SCSI IDs

Each SCSI device that is connected to a SCSI controller or adapter must have a unique SCSI ID. This ID enables the SCSI controller or adapter to identify the device and ensure that different devices on the same SCSI channel do not attempt to transfer data simultaneously. SCSI devices that are connected to different SCSI channels can have duplicate SCSI IDs.

To install external SCSI devices, you must first install an optional SCSI PCI adapter. Refer to the information that is provided with the device for instructions to set its SCSI ID.

Installing options 91