Installing Hardware Options
3–22 VAX 4000 Model 108 User Information
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Printers, terminals, modems, and other devices that use asynchronous or synchronous
connectors
Your Digital sales representative can give you information on how to order a full range of
SCSI and Q-bus expansion boxes, printers, terminals, modems, and other devices that are
compatible with VAX 4000 Model 108 systems.
Connecting a DSSI Expansion Box
To attach a DSSI expansion box, see Figure 2-21 and Figure 3-14, which show how to
attach a DSSI cable from either a DSSI VAXcluster or a DSSI expansion box to the
standard and optional TriLink adapters respectively.
To check expansion box connections, enter the following from the console prompt:
>>> SHOW DSSI
DSSI Bus 0 Node 0 (R7ALUC)
-DIA0 (RF72)
DSSI Bus 0 Node 1 (R7EB3C)
-DIA1 (RF72)
DSSI Bus 0 Node 2 (R7EB22)
-DIA2 (RF72)
DSSI Bus 0 Node 5 (TFDR1)
-MIA5 (TU81)
DSSI Bus 0 Node 6 (*)
>>>
Connecting Systems Into a DSSI VAXcluster Configuration
__________________________ Note ____________________________
A DSSI VAXcluster configuration is supported only under VMS Version 5.5-2xx or later.
___________________________________________________________
A DSSI VAXcluster configuration consists of two or more systems configured as a DSSI
VAXcluster and sharing their DSSI devices through a Digital Storage System Interconnect
(DSSI) bus. See the illustrations below for typical connections. Each system can have
direct access to any of the devices on the DSSI bus, including a shared system disk.
The simplest DSSI VAXcluster configuration, a two-system configuration, can let one
system disk be used as the system disk for both systems. Although the system disk resides
in one system, both systems have equal access to it and to any other DSSI storage device
in either system.
