Setting SCSI IDs for External Devices

Setting SCSI IDs for External Devices

The internal channel connector (you can only use one of the two internal channel connectors) and the external channel connector on the SCSI-2 Fast/Wide PCI-Bus Adapter accept SCSI IDs from 0 through 7. Each device attached to the external channel connector must have a unique SCSI ID and each device attached to the internal channel connector must have a unique SCSI ID.

For example, you can have a SCSI ID of 0 on a device attached to the channel 1 connector and a SCSI ID of 0 on a device attached to the channel 2 connector of the same SCSI-2 Fast/Wide PCI-Bus Adapter. However, you cannot have a SCSI ID of 0 on two devices attached to the same channel connector.

NOTE: Read the README file on the SCSI-2 Fast/Wide PCI-Bus Adapter for updated information. Select Option Diskette from the first menu screen.

The following table shows an example of using one internal and one external channel on the RAID adapter. Channel 2 is connected to bank A and Channel 1 is attached to an external DASD storage enclosure. Refer to the documentation supplied with the storage enclosure for physical locations.

Table 5. One Internal and One External Channel Mapping

Displayed Channel Number Displayed Bay Number Bank and Bay Physical Location SCSI ID 1 1 External 0 1 2 External 1 1 3 External 2 1 4 External 3 1 5 External 4 1 6 External 5 2 1 A1 0 2 2 A2 1 2 3 A3 2 2 4 A4 3 2 5 A5 4 2 6 A6 5 2 7 (CD-ROM) 6

Displayed Channel Number	Displayed Bay Number	Bank and Bay Physical Location	SCSI ID
1	1	External	0
1	2	External	1
1	3	External	2
1	4	External	3
1	5	External	4
1	6	External	5
2	1	A1	0
2	2	A2	1
2	3	A3	2
2	4	A4	3
2	5	A5	4
2	6	A6	5
2	7	(CD-ROM)	6

You must set a unique SCSI ID for each external SCSI device connected to the SCSI-2 Fast/Wide PCI Adapter. Therefore, do not set the SCSI IDs for external devices to the values that you use for internal devices. Refer to the instructions supplied with the SCSI devices for more information about setting a SCSI ID. The default ID for the SCSI-2 adapter is 7. The ID for the preinstalled CD-ROM drive is 3 on non-disk-array models, and 6 on disk-array models.

If the disk-array server was supplied with a preinstalled hard disk drive in bay 1, the ID is 0.

NOTE: If you install a second SCSI-2 adapter, you can use the same SCSI IDs that you use for the preinstalled SCSI-2 adapter.

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