IBM 3531 manual Installing identification labels

3.Unlock the door Þ Ý and hold it at a 90 degree angle to the front of the enclosure; then, lower the top of the door over the tab Þ Ý on the top of the enclosure.

4.Push the bottom of the door until it snaps into place over the tab Þ Ý on the bottom of the enclosure.

5.Verify the settings for internal Option Switch 1 and internal Option Switch 2 on the switch card.

Internal Option Switch 1 defines hard drive enumeration as either left-to-right (Off) or top-to-bottom (On). Internal Option Switch 2 swaps the operation of the general system error indicator with the power-on indicator. Both switches must be set to On when a new expansion unit is placed in a tower.

Attention: A loss of data can occur if you change the position of internal Option Switch 1 or internal Option Switch 3 after storing data on the hard drives. Refer to “Conversion of EXP300 to a tower or from a tower” on page 25 if you previously stored data on the drives and you now want to change the configuration of your expansion unit from a rack to a tower orientation.

6.Install the components in the EXP300 that you removed

Installing identification labels

The EXP300 Rack-to-Tower Conversion Kit comes with SCSI ID labels for rack and tower orientations. This kit also includes expansion unit ID labels for tower orientations.

To install the identification labels:

1.Install the SCSI ID label:

The internal Option Switch 3 on the switch card determines whether you have a single-bus (Off) or dual-bus (On) configuration. When internal Option Switch 3 is set to Off, all 14 drive bays are on a single SCSI bus. When internal Option Switch 3 is set to On, two independent internal seven drive SCSI buses are created.

External SCSI Bus 1 maps to internal SCSI Bus 1 and external SCSI Bus 2 maps to internal SCSI Bus 2. The EXP300 assigns the seven internal Bus-1 bays to SCSI IDs

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