NonStop NS-Series Planning Guide (H06.03+)

HP Integrity NonStop NS-Series Planning Guide—529567-004
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Introduction to Integrity NonStop
NS-Series Systems
This section introduces the Integrity NonStop NS-series servers and covers these
topics:
NonStop System Primer
NonStop S-series systems cluster physically independent uniprocessor modules via
the ServerNet interconnect fabrics, with each logical uniprocessor consisting of a lock-
stepped pair of microprocessors. These lock-stepped processors share a single main
memory array plus an intelligent interface to a redundant pair of ServerNet fabrics. The
NonStop S-series architecture requires rigid, cycle-by-cycle deterministic operation of
every element plus the physical interface to support lockstep operation. It also provides
fault isolation between logical processors while allowing physical scaling (adding one
or two processors to the node at a time to increase performance).
Topic Page
NonStop System Primer
1-1
NonStop Advanced Architecture 1-2
Processor Complex 1-3
Processor Element 1-5
Duplex Processor 1-5
Triplex Processor 1-7
Processor Synchronization and Rendezvous 1-8
Memory Reintegration 1-8
Failure Recovery for Duplex Processor 1-8
Failure Recovery for Triplex Processor 1-9
ServerNet Fabric I/O 1-9
System Architecture 1-11
Modular Hardware 1-12
NonStop S-Series I/O Hardware 1-12
System Models 1-12
Software Considerations 1-12
Default Startup Characteristics 1-13
Migration Considerations 1-14