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Document ID: MCGN-46BRA5

Netfinity EXP15 - Drive numbering

Applicable to: World-Wide

Source: Hardware Maintenance Manual

Drive Numbering
There are two SCSI channels (1, 2) in the Expansion Unit. Each channel uses five SCSI ID numbers. Each disk drive within the Expansion Unit has a unique channel number and SCSI ID number, based on its physical location in the expansion unit.

When a drive is plugged into the midplane, its channel number and SCSI ID are set automatically. See the following illustration for bus and SCSI ID values when
option switch 1 is set to the on (up) state. Use the option switch on the ESM board to change the ID settings.

The first number represents the channel number and the second is the SCSI ID.

Notes For IBM ServeRAID, the view configuration screens show bay numbers, not SCSI IDs. To calculate the bay number, add 1 to the SCSI ID. A blank label is provided in the drive tray behind the drive latch. Use this label to record the address location information for each drive before you remove it. If you install a drive in the wrong bay, data will be lost. If you are replacing a drive that is part of a RAID level 1 or RAID level 5 logical drive, ensure that you install the replacement drive in the correct bay. Failure to replace the drives in their correct bays can result in loss of data.

If the two channels are daisy chained using option switch 1 in the off position, then the SCSI IDs are as shown and the drives are all on the same channel.

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	Document Category	Diagrams
	Date Created	25-03-99
	Last Updated	21-05-99
	Revision Date	25-03-2000
	Brand	IBM PC Server
	Product Family	Rack/Storage Enclosures
	Machine Type	3520
	Model	ALL
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