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

Introduction

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

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Modular I/O Connectivity

Anywhere an I/O enclosure can be connected in the ServerNet tetrahedron, an IOAM

enclosure can be connected.

Rules that govern mixed configurations (IOAM enclosures and I/O enclosures in the

same server) are specified in the NonStop S-Series Planning and Configuration Guide.

Internal Structure of the IOAM Enclosure

Because the main functional units in I/O modules are ServerNet adapters, the modules

are properly identified as I/O adapter modules, and the modular I/O enclosure is

consequently identified as the I/O adapter module enclosure, or IOAM enclosure.

For software references, the two modules in any IOAM enclosure are numbered

module 2 and module 3. The module containing the X fabric ServerNet switch is

module 2, and the module containing the Y fabric ServerNet switch is module 3.

Physical Racking of IOAM Enclosures

Figure 1-21 shows the typical physical appearance of IOAM enclosures when installed

in a 19-inch rack mount cabinet.

Each IOAM enclosure includes separately removable ServerNet switch boards. As

indicated in the preceding figure, the removal of one switch board does not disable the

ServerNet adapters of the associated module but merely reduces communication to

the opposite fabric.

Each IOAM enclosure houses two arrays of ServerNet adapters (here assumed to be

FCSAs), numbered 1 through 5 for each of the two modules. ServerNet adapters can

be installed or removed while the server is online.

In addition, each IOAM enclosure has four separate power supplies and four separate

cooling fans. These components are grouped two for each module to provide

redundant power and cooling for the two modules.