User`s guide

availability options also are sacriﬁced. Digital does not recommend this

conﬁguration.

• The six SCSI–2 device cables (three for HSJ30) from the controller shelf can

be routed to more than one SBB shelf as desired, taking into consideration

prescribed conﬁguration rules and restrictions as listed in Chapter 3.

The HSJ array controllers consist of a single module that can be conﬁgured alone

(nonredundant) or with a second like controller module for dual-redundant

availability, and a read or write-back cache module (one for each controller

module).

The HSJ array controllers interconnect to the host by way of Digital’s CI

interface. An internal CI host port cable connects to each controller and

routes through the cabinet, exiting at the back of the cabinet near the ﬂoor.

Four external (blue) CI cables connect to the end of each internal CI host port

connector and then route to a star coupler. From the star coupler, the cables route

to the host computer. Refer to the VAXcluster Systems Guidelines for VAXcluster

System Conﬁgurations manual for supported conﬁgurations with star couplers.

See Section 4.6.2.1 for installation instructions for CI host port cables.

The combination of HSJ array controllers in controller shelves, storage shelves

with their power supplies, assorted SCSI–2 device and CI cables, and cable

distribution units (CDU) compose the HSJ array controller subsystem. Refer to

the VAXcluster Systems Guidelines for VAXcluster System Conﬁgurations manual

for supported conﬁgurations with storage components.

Figure 1–1 shows an HS array controller subsystem conﬁguration in an SW800-

series (1700 mm high) data center cabinet (front view). Controller subsystems

also are available in SW500-series (1100 mm high) cabinets and SW300-series

deskside RAID enclosure cabinets.

Introduction to HS Array Controllers 1–3