NonStop NS16000 Planning Guide (H06.08+)

Integrity NonStop NS16000 System Description
HP Integrity NonStop NS16000 Planning Guide—529567-009
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Examples of ServerNet Pathways
If a cable, connection, router, or other failure occurs, only the system resources that
are downstream of the failure on the same fabric are affected. Because of the
redundant ServerNet architecture, communication takes the alternate path on the other
fabric to the peer resources. For example, if the ServerNet switch board for the Y fabric
fails, the downstream adapters and the storage or communications that connect to the
failed switch board are unavailable to the system. The system then switches the
communication to the X fabric where all devices are available. After the failed FRU is
replaced, the affected fabric and resources connected to it are again available to the
system.
In a second scenario, if one of the ServerNet adapters fails, only the Fibre Channel or
Ethernet devices that are connected to the failed adapter are affected. The failure has
no effect on the other resources on the same or the other ServerNet fabric.