HP NonStop G-Series - Manual (Page 240)

These three methods are supported for updating to the split-star or tri-star topology:
Merging two star topologies to create a split-star topology ●
Merging a star topology with a split-star topology to create a tri-star topology ●
Merging three star topologies to create a tri-star topology ●
The major steps in updating a topology are:
Review the planning information in the ServerNet Cluster Manual for your type of
update. Decide which nodes will be connected to each pair of switches in the new
topology by using the planning forms in the manual. 1.
Ensure you have all the cluster switches and ServerNet cables in place to expand your
cluster. For complete hardware requirements, see the ServerNet Cluster Manual. 2.
Ensure that at least one node is connected to each cluster switch. 3.
Ensure you have the minimum levels of software running on all the nodes of your cluster.
Because you are using OSM to perform the update, you might already have newer
versions of the software described in the manual. Even so, be sure all nodes meet the
minimum requirements described in
Software Requirements for Split-Star and Tri-Star
Topologies .
4.
Ensure that you have the minimum version of firmware and configuration on each cluster
switch. See
Software Requirements for Split-Star and Tri-Star Topologies .
Caution: Do not proceed if you have the T0569AAA configuration running on any
of the switches. Doing so can cause outages on every system in the
cluster.
5.
Use the OSM service connection to ensure that the clusters to be merged are trouble free.
If there are any alarms, follow the repair actions to resolve the problems. 6.
Use the Configuration Update action to change the configuration tags so they are
compatible with the new topology:
If you are merging two star topologies to create a split-star topology, change the
configuration tags for the switches in one star topology to support node numbers 9
through 16. ●
If you are merging a split-star topology with a star topology to create a tri-star
topology, change the configuration tags for the switches in the star topology to
support node numbers 17 through 24. This practice avoids the need for a
configuration tag change on the split-star topology. (The split-star topology already
uses node numbers 1 through 16.) ●
If you are merging three star topologies to create a tri-star topology, change the ●
7.