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Document ID: DDSE-42ZPSL

Netfinity 5500 - SCSI Drives

Applicable to: World-Wide

SCSI Drives:
Some drives have a special design called small computer system interface, or SCSI. This design allows you to attach multiple drives to a single SCSI channel.

Notes 1. Any information about SCSI drives also applies to other SCSI devices, such as tape drives. 2. If you plan to install both internal and external SCSI devices, you must follow the instructions in "External Options", in addition to the instructions in this section.

A 16-bit (wide) SCSI cable connects the hot-swap backplane to one channel of the integrated RAID SCSI controller on the system board. An additional 16-bit SCSI cable with connectors for optional devices in bays A and B connects to the second channel of the RAID controller. This cable has a terminator at the other end and is folded and restrained with a cable clamp to the bottom of your server between the open bays and the power supply area.

SCSI IDs:
Each SCSI device that is connected to an individual channel of the RAID controller needs a unique identification (ID) so that the controller can identify the devices and ensure that different devices do not attempt to transfer data at the same time. (The two channels of the integrated RAID controller operate independently.) If you need to set IDs for SCSI devices, refer to the instructions that come with those devices.

Your server automatically sets SCSI IDs for hot-swap hard disk drives, according to the jumper settings on the SCSI backplanes. The server uses the hard disk drive SCSI IDs to send status information to the indicator lights above each hot-swap bay.

The SCSI backplane in the server supports up to six hot-swap bays. Table 8 shows the default SCSI IDs that the backplane assigns for hot-swap hard disk drives.

You can change the default ID addresses of the drives by changing the jumper settings on the SCSI backplane. See
"SCSI Backplane Option Jumpers". A simplified layout of the SCSI backplane is shown in "SCSI Backplane Component Locations".

The processing sequence for SCSI devices is set through the ServeRAID Configuration Utility program. The sequence proceeds from the lowest SCSI ID to the highest (0 to 6, then 8 to 15 determined by the jumper settings).

Termination (Internal SCSI Devices):
SCSI buses must be terminated at each end. The ends of the SCSI buses in your server are already terminated.

All the hot-swap drives in your server have automatic termination and the RAID controller provides termination at the other end of the SCSI bus.

If you install SCSI devices in the removable-media bays (bays A and B), you must disable the termination on the devices; the RAID controller is already terminated and the SCSI cable for devices in the removable-media drive bays has a terminator at the other end. For example, when you install a SCSI device in a removable-media drive bay (bay A or B), set its termination to Disable, because the SCSI cable is already terminated at the end.

Refer to the information that come with the SCSI device for instructions about setting device jumpers or switches that control termination.

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	Document Category	CD-ROM Drives, Hard Drives, Tape Drives, Backplane, Controllers
	Date Created	09-12-98
	Last Updated	09-12-98
	Revision Date	09-12-99
	Brand	IBM PC Server
	Product Family	Netfinity 5500
	Machine Type	8660
	Model	ALL
	TypeModel
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