Installation guide

A-4 Storage Architecture Overview
A.2 DSSI and CI VMSclusters Compared
Figure A-2 CI and DSSI Compared
VAX
7000
The Digital Storage System Interconnect (DSSI) bus is sup-
ported on VAX 7000 systems using the KFMSA-BA adapter.
It is a daisy-chained multi-drop bus that connects up to
eight nodes. Logically, each DSSI bus is equivalent to a
small CI, including the associated logical Star Coupler. A
CI storage unit and HSC is equivalent to a DSSI ISE (see
Figure A-2).
BXB-0070C-92
NI
Adapter
CI
Adapter
NI
Adapter
CI
Adapter
VAX
NI
Adapter
KFMSA
VAX
NI
Adapter
KFMSA
VAX
HSC
Tape/Disk Tape/Disk
CI
NI -- Ethernet
Tape/Disk
Controller
ISE
Tape/Disk
Controller
DSSI
CI Equivalent
of DSSI's ISE
ISE
DSSI
VAX