B-2
DSSI Concepts
B.1 DSSI Basics
Table B-1 summarizes DSSI terminology and concepts. The indi-
cated references provide more information.
•
VAX 7000 systems support DSSI subsystems in single-, dual-, tri-, or
quad-host configurations using the KFMSA-BA adapter.
•
Each KFMSA-BA adapter has two buses, each of which can attach
seven additional nodes (ISEs or another KFMSA-BA adapter).
•
ISEs can be RF disk or TF tape drives.
•
RF ISEs are housed in disk PIUs in the system or expander cabinets.
•
TF85 ISEs are housed in the system cabinet.
Table B-1
DSSI Concepts
Term
Reference
Definition
Control
panel
DSSI
VAXcluster
Installation
Guide
An enclosure interface that allows remote
control of DSSI node ID selection and ISE
operating status.
DSSI
DSSI
VAXcluster
Installation
Guide
Digital Storage System Interconnect. A
DSA-based storage interconnect used by
the KFMSA-BA adapter and the RF and
TF series integrated storage elements to
transfer data and to communicate with
each other.
Dual-host
Section B.3
Storage configuration where ISEs are
shared between two DSSI adapters on a
DSSI subsystem with two host systems.
ISE
Section B.2
Integrated storage element. On the DSSI
storage bus, all RF and TF storage devices
are ISEs.