Installation & Configuration Setting SCSI ID Switches

Installation

Setting SCSI ID Switches

CAUTION! Do not set SCSI ID switches A3, A4, B3, or B4 to ID 0. If their IDs are set to 0, an over-current condition will occur during the power-on sequence and the power module will shut down.

CAUTION! All storage modules and host bus adapters (HBAs) must have unique SCSI IDs. If two or more devices have the same SCSI ID on the SCSI bus, the host will not recognize those devices.

NOTE! SCSI ID 7 is normally reserved for the host bus adapter (HBA). SCSI IDs 8 through 15 are used only by fast/wide differential (DF) modules.

To set SCSI ID switches for the disk and tape modules:

1.Perform an ioscan (HP-UX) or sysgen (MPE-iX) to determine which SCSI IDs are already in use.

2.Locate the SCSI ID switch for the device (see Figure 10, items 3 through 6 and 9 through 12).

3.Set the SCSI ID switch to an ID number not in use by another device (see Figure 11 and Figure 12):

∙When setting SCSI IDs for 1-inch modules, use the SCSI ID switch that corresponds to the slot number occupied by the module. For example, if a disk module occupies slot A4, use SCSI ID switch A4.

∙When setting SCSI IDs for 1.6-inch modules, use the SCSI ID switch that corresponds to the lowest slot occupied by the module. For example, if a DDS tape module occupies slots A1 and A2, use SCSI ID switch A1.

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