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

Integrity NonStop NS14000 System Description
HP Integrity NonStop NS-Series Planning Guide—529567-008
8-10
ServerNet Fabric I/O
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 through the Y fabric. 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 adapters that are connected to the failed adapter are affected. The failure has
no effect on other resources on the same or other ServerNet fabric.