ServerNet Cluster Web

What does the Expand-over-ServerNet line-handler process do?
The Expand-over-ServerNet line-handler process is a process pair that handles
incoming and outgoing Expand messages using the ServerNet protocol. Like the
Expand-over-FOX line-handler process, Expand-over-ServerNet manages
security-related messages. Other messages usually bypass the line-handler process
and are handled directly by the message system. A single Expand line is associated
with an Expand-over-ServerNet line-handler process.
What is the Expand/ServerNet profile? The Expand/ServerNet profile is a
software component that must be present on a NonStop™ S-series server in order
for the server to join a ServerNet cluster. This profile is not a standard part of the
site update tape (SUT) but is included on the SUT when you order the ServerNet
Cluster product.
If two systems are linked by more than one type of Expand line (for
example, Expand-over-ServerNet and Expand-over-FOX), which line will be
used? The path with the lowest configured TIMEFACTOR is the one chosen. System
operators can configure the path with whatever value they want.
Expand-over-ServerNet is currently the fastest supported line.
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Installation
Do I have to install new hardware to construct a ServerNet cluster?
Yes. At least two cluster switches must be installed for each cluster. One cluster
switch serves the external ServerNet X fabric. The other cluster switch serves the
external ServerNet Y fabric. Additional cluster switches are needed for large
topologies.
In addition, MSEBs must be installed in slots 51 and 52 of the group 01 enclosure of
each system to join a cluster. The MSEBs must contain an NNA FPGA in port 6. Also,
single-mode fiber-optic ServerNet cables must be connected between the group 01
enclosure and the cluster switches.
How do I replace an SEB with an MSEB? You can replace an SEB with an MSEB
(or an MSEB with another MSEB) online using the guided procedure for replacing an
SEB or MSEB.
Do I have to install new software to connect a ServerNet cluster? Yes. For
ServerNet clusters using the star topologies, you must upgrade to G06.09 or a later
RVU. G06.12 is required for the split-star topology, and G06.14 is required for the
tri-star topology.
The layered topology (built with 6780 switches) requires G06.19 plus SPRs or the
G06.21 and later RVUs.
The RVU includes most of the software components required for clustering—
SNETMON/MSGMON, SANMAN, SP firmware, and TSM or OSM. In addition, you must
also have an Expand license and purchase the Expand/ServerNet profile that is
required for ServerNet communications using Expand.
Can I obtain clustering software by installing SPRs? Yes, but only for servers
running certain RVUs. Add SPRs to G06.09 through G06.11 to obtain support for a
split-star topology (for clusters up to 16 nodes). Add SPRs to G06.13 to obtain
support for a tri-star topology (for clusters up to 24 nodes). For information about
these SPRs, refer to the ServerNet Cluster Manual.