NonStop S-Series Server Description Manual (G06.27+)

Introduction

HP NonStop S-Series Server Description Manual—520331-004

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Processor Enclosures and I/O Enclosures

A NonStop S-series server is a computer system that is structured around many

parallel components, both physical and logical. For example, a single server can

include up to 16 processors (CPUs).

Processors are housed two in a processor enclosure. Thus a four-processor server

would be contained in two processor enclosures, as illustrated in the left part of

Figure 1-1. As will be shown later, processor enclosures include a considerable I/O

capability, so that I/O enclosures, illustrated as part of the server in the right part of

Figure 1-1 (or modular I/O enclosures, not shown) would only be needed where I/O

requirements exceed the I/O capability built into the processor enclosures.

Processor enclosures and I/O enclosures are structurally the same. A processor

enclosure can be converted to an I/O enclosure (or vice versa). Primarily, the

conversion requires swapping the internal processor multifunction (PMF) CRUs for

I/O multifunction (IOMF) CRUs. (CRU is customer-replaceable unit.)

The processor enclosures for NonStop S7000 servers differ from other processor

enclosures in one major way. At the bottom of the other enclosures, a shelf houses the

power supplies for the processor multifunction (PMF) CRUs. This space is empty for

the NonStop S7000 server. The reason for this difference is that the power supplies for

the NonStop S7000 processors are part of the processor CRU but are separate for the

other processors.