Digital Equipment Corporation Storage Works Uživatelská příručka stáhnout pdf (Strana 51)

StorageWorks SCSI Buses

5.6 Multiple SBB Shelves with a Single SCSI Bus

Use the following procedure to conﬁgure two SBB shelves with seven devices on

one SCSI bus, as shown in Figure 5–5:

Note

The maximum number of SBB shelves on a single SCSI bus is two. A

maximum of seven storage SBBs can be installed in both shelves.

1. Turn off the shelf power by disconnecting the power cable from the shelf

power SBBs.

2. Remove the blowers as described in Section 3.2.

3. Discharge any static buildup by momentarily touching a ﬁnger to a blank

space on the backplane.

4. Make sure that the SHELF_OK jumpers are installed correctly on either the

backplane or on both the terminator board and the jumper board as described

in Chapter 2.

5. On the upper shelf, install the BA35X–MC jumper board in the backplane

connector behind slot 5.

6. On the lower shelf, install the BA35X–MC jumper board in the backplane

connector behind slot 5.

7. On the lower shelf, install the BA35X–MB terminator board in the backplane

connector behind slot 1.

8. Connect a BN21H-0E SCSI cable between the lower connector on the upper

shelf and the upper connector on the lower shelf.

9. Ensure that each device has a different SCSI bus address.

10. Replace the blowers as described in Section 3.2.

11. Turn on the power and verify that all the devices are active.

Figure 5–5 Single SCSI Bus on Two SBB Shelves

CXO-3598B-MC

7-DEVICE BUS INPUT

0123456

POWER

OUT

SHELF 1



SHELF 2



0123456

POWER



JA1

JB1

BUS LENGTHS:

SHELF 1: 0.9 m (35.7 in)

SHELF 2: 0.9 m (34.7 in)

CABLE: 0.5 m (19.7 in)

TOTAL: 2.3 m (90.1 in)

JA1

JB1

(7)

StorageWorks SCSI Buses 5–9

1 2 ... 46 47 48 49 50 51 52 53 54 55 56 ... 73 74

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