DEC 4000 600 series, Руководство пользователя, Страница: 144 / 242

Special Configurations
Special Configurations
Overview The following special configurations create a unique system
environment:
• Dual CPU systems
• DSSI VMScluster
Dual CPU
Systems
A second CPU can be added to any DEC 4000 AXP system.
Adding a second CPU approximately doubles the computing
power of the original system.
DSSI
VMSCluster A DSSI VMScluster configuration consists of two or more
systems, running VMS software, configured as a DSSI cluster
sharing their DSSI devices through a bus. Each system can have
direct access to any of the devices on a shared DSSI bus; this can
include a shared common disk.
The simplest DSSI VMScluster configuration, a two-system DSSI
VMScluster, for example, can allow one system disk to be used
as the system disk for both systems. The system disk physically
resides in one enclosure; however, both systems have equal
access to the system disk and to any other DSSI mass storage
device in either enclosure.
A DSSI device, such as the RF73, has a built-in DSSI
VMScluster capability that allows it to serve two or more
systems simultaneously. The DSSI adapters, embedded in
the system’s I/O module, allow you to extend a DSSI bus by
physically connecting it to another system.
6–4 System Configuration