ServerNet Cluster 6780 Planning and Installation Guide (G06.24+, H06.03+)

ServerNet Cluster Hardware Description
ServerNet Cluster 6780 Planning and Installation Guide—527301-004
2-20
NonStop S-Series Servers
NonStop S-Series Servers
NonStop S-series servers contain these components to support ServerNet clusters:
•
Service Processors (SPs) on page 2-20
•
Modular ServerNet Expansion Boards (MSEBs) on page 2-20
•
Node-Numbering Agent (NNA) Field-Programmable Gate Array (FPGA) Plug-in
Card (PIC) on page 2-21
Service Processors (SPs)
In a NonStop S-series server, SPs are components of the processor multifunction
(PMF), PMF2, I/O multifunction (IOMF), and IOMF 2 CRUs.
For the internal ServerNet fabric, SPs assign ServerNet IDs to processors and I/O
devices and configure the SEBs and MSEBs to route packets between these devices.
For NonStop S-series servers in a ServerNet cluster, the SPs:
•
Assign ServerNet IDs for the processors in a server in a regular fashion, such that
a client can request a ServerNet ID for a given processor in a given (logical) node
from any master service processor (MSP) in any node in the ServerNet cluster.
•
Program the SEBS or MSEBs, as well as any other routers within a NonStop
S-series server, to route packets to the MSEBs that connect this system to the
external ServerNet fabrics. Such routing occurs whenever these packets are
addressed to a ServerNet ID that does not lie within the range of ServerNet IDs for
the current system.
•
Program the MSEBs in slots 51 and 52 of the group 01 system enclosure to route
ServerNet packets to the external fabrics if the packets are destined for a different
node.
•
Control the configuration of the NNA FPGA PIC.
Modular ServerNet Expansion Boards (MSEBs)
MSEBs contain plug-in cards (PICs) that provide a choice of connectors for routing
ServerNet packets for both the internal and external ServerNet fabrics.
For the internal fabric within each NonStop S-series server, MSEBs can contain a
variety of cable media (ECL, multimode fiber-optic, or serial copper) to provide
connections between system enclosures.
For ServerNet clusters, MSEBs provide the connection from the internal ServerNet
fabrics to the external ServerNet fabrics. All packets to other nodes travel through the
MSEB to the external X fabric or external Y fabric. Messages are routed to the external
fabrics using the Node-Numbering Agent (NNA) Field-Programmable Gate Array
(FPGA) Plug-in Card (PIC) on page 2-21 installed in the MSEBs.