Compaq StorageWorks UltraSCSI RAID Enclosure (DS-BA370 Series) User's Guide (EK-BA370-UG. C02, September 1998)

Introducing the UltraSCSI RAID Enclosure

1–6 UltraSCSI RAID Enclosure

Expansion enclosures

have

filler panels

installed in the controller

and cache module slots that improve air flow and reduce

electromagnetic interference (EMI)

radiation.

The blank panels in the controller B and cache module B locations

improve air flow and control EMI in enclosures with only one

controller.

The enclosure backplane eliminates the need for cables to connect the

six vertical buses to the four horizontal drive SBB shelves. All the

devices on a shelf use the same SCSI bus

identifier (ID)

. The PVA

address switch defines the SCSI bus ID of each shelf. See Figure 1–3

for bus and shelf identifiers when viewing the enclosure from the

front.

Figure 1–3 Typical Enclosure Bus and Device Addressing

The ac input boxes distribute ac power to the individual shelf power

supplies through ac power cables. The backplane distributes the dc

output voltages (+5 V dc and +12 V dc) from the power supplies to

the following components:

Figure C

ALLOUT

1. SCSI bus

CXO6266B

4561

Shelf 4

Shelf 3

Shelf 2

Shelf 1