NonStop NS-Series Planning Guide (H06.05+)

Integrity NonStop NS14000 System Description
HP Integrity NonStop NS-Series Planning Guide—529567-008
8-6
ServerNet Fabric I/O
ServerNet Fabric I/O
This subsection provides information about the ServerNet network in an Integrity
NonStop NS14000 system and covers these topics:
For further information on the ServerNet network, protocols, IP addresses, and naming
conventions, see the Introduction to Networking for Integrity NonStop NS-Series
Servers.
Overview
ServerNet 3 routers are used within the Integrity NonStop NS14000 systems as
building blocks for the ServerNet fabric, which employ fiber-optic links exclusively and
is a collection of connected routers and links that form a flexible internal or external
network. This high-speed network within an Integrity NonStop NS14000 system
logically connects NonStop Blade Complexes to the ServerNet adapters and system
I/O such as disks and Ethernet LANs by way of ServerNet switch boards in an IOAM
enclosure. The ServerNet switch boards in the IOAM enclosure provide logical
connectivity to processors (through the LSUs) and I/O devices.
In the Integrity NonStop14000 server, fiber-optic links connect LSUs in the NonStop
Blade Complex to 4PSEs located in the IOAM enclosure. The 4PSEs provide the
physical ServerNet connectivity to the LSUs by externalizing the ServerNet links from
the IOAM enclosure midplane. Up to four 4PSEs can be installed in an IOAM
enclosure, in slots 1 and 2 of modules 2 and 3. Each 4PSE supports up to four
processors on one fabric.
The ServerNet network architecture is full-duplex, packet-switched, and point-to-point
in a star configuration. It employs two independent I/O communications paths
throughout the system: the ServerNet X fabric and the ServerNet Y fabric. These dual
paths ensure that no single failure disrupts communications among the remaining
system components.
Topic Page
Overview
8-6
Simplified ServerNet System Diagram 8-7
P-Switch ServerNet Pathways 8-7
IOAM Enclosure ServerNet Pathways 8-8
Example System ServerNet Pathways 8-9
Note. Logical synchronization units (LSUs) connect directly to 4PSEs in the IOAM enclosure.
Unlike the Integrity NonStop NS16000 system, the Integrity NonStop NS14000 system does
not use p-switches.