ServerNet Cluster Manual

ServerNet Cluster Description
ServerNet Cluster Manual—520575-003
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Plug-In Cards
Plug-In Cards
A plug-in card (PIC) allows an MSEB or a ServerNet II Switch to support a variety of
ServerNet cable media. The MSEB chassis can hold six single-wide PICs. A single-
wide PIC has one connector.
The ServerNet II Switch can accommodate eight single-wide PICs and two double-
wide PICs. Double-wide PICs have two connectors and are installed in each ServerNet
II Switch in ports 8 through 11.
Table 1-3 describes the PICs used for ServerNet cluster installations. Other types of
PICs, such as multimode fiber PICs and serial copper PICs, are available for
connecting ServerNet cables for the internal fabrics.
PICs are Class 3 customer-replaceable units (CRUs). However, they are replaceable
when installed in MSEBs but not when installed in ServerNet II Switches. For more
information about service categories for ServerNet cluster hardware components, refer
to Appendix D, Service Categories for Hardware Components
.
Node-Numbering Agent (NNA) FPGA
The node-numbering agent is a field-programmable gate array (FPGA) contained
within one of the single-mode, fiber-optic PICs. The NNA FPGA converts the
ServerNet IDs of packets routed to the external ServerNet fabrics so that they can be
directed to another server.
An NNA FPGA can be installed only in port 6 of the MSEBs in slots 51 and 52 of group
01. The NNA FPGA translates the ServerNet source and destination IDs for all packets
going to or coming from the external ServerNet fabrics.
Table 1-3. PICs Used for ServerNet Cluster Installations
PIC Type Where Installed Function
ECL MSEBs Allows first-generation ServerNet cables to
be connected to MSEBs.
Single-mode fiber ServerNet II Switches Allows fiber-optic cable to be connected
from the MSEBs in group 01 of each node
to the cluster switches.
Double-wide fiber ServerNet II Switches Allows two ServerNet II Switches to be
connected together on the same fabric to
support a split-star topology.
Single-mode fiber
with NNA FPGA
Group 01 MSEBs,
slots 51 and 52,
port 6
Allows fiber-optic cable to be connected
from an MSEB in group 01 of each node to
the cluster switch and carry out node-
numbering function for the cluster.