B-4
DSSI Concepts
B.2 Integrated Storage Elements (ISEs)
Of the eight nodes available between any two terminators on a
DSSI bus, a maximum of three nodes can be KFMSA-BA adapters,
the rest ISEs. ISEs are RF disks and TF tapes that populate up to
seven nodes on any DSSI bus. Each ISE has a controller and a disk
or tape drive.
Figure B-1
ISEs for the DSSI Storage Bus
7
7
KFMSA
Single-Host
XMI
ISE
0
ISE
1
ISE
2
ISE
3
ISE
4
ISE
5
ISE
6
ISE
0
ISE
1
ISE
2
ISE
3
ISE
4
ISE
5
ISE
6
BXB-0072-92
DSSI Bus 1
DSSI Bus 2
7
7
KFMSA
Host System 1
XMI
ISE
0
ISE
1
ISE
2
ISE
3
ISE
4
ISE
0
ISE
1
ISE
2
ISE
3
ISE
4
KFMSA
XMI
6
6
Host System 2
DSSI Bus 1
DSSI Bus 2