HP Integrity NonStop J-Series - Manual (Page 295)

14 Updating ServerNet Cluster Topology
You can update a ServerNet cluster to support more nodes or to expand the geographical limits
of the cluster.
These topics provide guidance on the different types of topology updates:
• To locate relevant information for your update, see Identifying Your Update Type .
• If you need to add a node to a cluster without changing the topology, log on to the node
using OSM, and perform the
Add Node to ServerNet Cluster action. This action launches a
guided procedure with online help to assist you.
Identifying Your Update Type
These topics describe different ways to update a ServerNet cluster. Click the appropriate link for
your type of update.
• Migrating to the Layered Topology describes how to migrate a cluster from one of the star
topologies to the layered topology.
• Adding Zones or Layers to a Layered Topology describes how to add zones or layers to a
cluster already using the layered topology .
• Updating Star Topologies describes how to use the OSM Update ServerNet Cluster Topology
action to:
—
Merge two star topologies to create a split-star topology
— Merge a star topology and a split-star topology to create a tri-star topology
— Merge three star topologies to create a tri-star topology
Migrating to the Layered Topology
The layered topology requires HP NonStop ServerNet Switches (model 6780).
To migrate a ServerNet cluster from one of the star topologies to the layered topology, you must
have on hand enough 6780 switches and ServerNet cables to support your cluster. You need at
least two switches (one for each external fabric) for every eight nodes.
For details on planning a migration to the layered topology, including hardware, software, and
cabling requirements, see the ServerNet Cluster 6780 Planning and Installation Guide.
For a quick reference on cable connections, see Cable Connections in a Layered Topology .
Adding Layers or Zones to a Layered Topology
You can expand an existing ServerNet cluster that uses the layered topology by adding layers or
zones.
For complete instructions for adding layers or zones, see the ServerNet Cluster 6780 Planning and
Installation Guide.
Updating Star Topologies
Follow this procedure only if you plan to use OSM to merge clusters to create a split-star or tri-star
topology.
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