User`s guide

StorageWorks Status Reporting

2.1 Shelf Status

2.1.2 Processing the SHELF_OK Signal

To ensure that the shelf is properly conﬁgured so that a controller can process the

SHELF_OK signal, you must install a jumper either on the shelf backplane or on

both the terminator and jumper boards.

There are two ways to route the SHELF_OK signal to the controller. BA350–

SA SBB shelves shipped after February 1993 have backplane jumpers. These

jumpers are located on the rear of the backplane adjacent to slot 2. For shelves

manufactured earlier, there are SHELF_OK jumpers on both the terminator

board and the jumper board. In both cases, the default conﬁguration has the

SHELF_OK jumper installed.

CAUTION

Not all hosts and controllers can process the SHELF_OK signal. Before

installing the SHELF_OK jumper. Read the controller documentation to

determine if the controller can process the SHELF_OK signal.

Installing the SHELF_OK jumper when the controller cannot process the

SHELF_OK signal may result in an incorrect shelf status being displayed.

Use the procedures in the following sections to conﬁgure the SHELF_OK as

follows:

• If the SBB shelf was received March 1993, use the procedures in the

Backplane SHELF_OK Jumper section.

• If the SBB shelf was received before March 1993, use the procedures in the

Terminator Board and Jumper Board SHELF_OK Jumpers section.

• If you are not sure when the SBB shelf was received, remove the left-hand

blower from the rear of the shelf and check for jumper pins adjacent to slot 2.

StorageWorks Status Reporting 2–3