NonStop NS1000 Planning Guide (H06.05+)

Integrity NonStop NS1000 System Description
HP Integrity NonStop NS1000 Planning Guide—542527-004
4-8
System Architecture
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.
System Architecture
This diagram shows elements of an example Integrity NonStop NS1000 system with
four processors:
ESS
IOAME
Fibre Channel
Disk Module
FCAL A FCAL B
High-Speed Ethernet
Fibre
Channel
Tape
I/O Adapter
Module 2
I/O Adapter
Module 3
4PSE 4PSE 4PSE 4PSE
High-Speed
Ethernet
G4SA G4SA FCSA FCSA FCSA FCSA
Blade element 1 Blade element 2 Blade element 3 Blade element 4
Processor 0
Processor 1
Processor 2
Processor 3
X Y
X Y X Y
X Y
ServerNet
PCI adapter
card links
ServerNet
PCI adapter
card links
ServerNet
PCI adapter
card links
ServerNet
PCI adapter
card links
VST816.vsd