NonStop Systems Introduction for H-Series RVUs

NonStop Systems Introduction for H-Series RVUs—540083-001
7-1
7
Integrity NonStop NS-Series Server
Architecture
The previous section, Section 6, The NonStop Operating System, showed that the
NonStop operating system supports the NonStop application server environment with a
powerful, reliable message system. The NonStop operating system and its Expand
network extension constitute the software architecture of Integrity NonStop NS-series
servers.
This section examines the hardware architecture of Integrity NonStop servers and
considers how this architecture supports the execution of programs in the NonStop
application environment.
Software and Hardware Views of Architecture
The next two figures compare the software and hardware architectures of Integrity
NonStop servers.
Figure 7-1 illustrates the software architecture, as described in the previous section. In
each system, programs can run as process pairs (represented by A and A', B and B',
and so on). A process communicates with other local processes and with local devices
by using the file system and message system. A process communicates with remote
processes and devices in other systems by using the same operating system layers
and the Expand network software.
Figure 7-2 on page 7-3 now illustrates the hardware architecture of NonStop systems.
This architecture is known as the NonStop advanced architecture (NSAA). At the
highest level, the basic building block of a NonStop NS-series system is the NonStop
Blade Complex. A NonStop Blade Complex consists of two or three CPU modules
Figure 7-1. Software Architecture of Integrity NonStop Servers
VST090.vsd
network
Expand
System A System B
Processor 0
A
B
File system
Message system
Processor 0
File system
Message system
C
D
Dual ServerNet fabrics
Processor 1
File system
Message system
C'
D'
Dual ServerNet fabrics
Processor 1
A'
B'
File system
Message system