ServerNet Cluster Manual

Upgrading a ServerNet Cluster
ServerNet Cluster Manual—520575-003
4-6
Task 2: Choose the Topology That You Want to
Upgrade To
Task 2: Choose the Topology That You Want to Upgrade To
To choose the upgrade topology, decide the maximum number of nodes that the
upgraded cluster will need to support. This number should include anticipated future
growth in the cluster. For maximum scalability, HP recommends upgrading to the tri-
star topology or a subset of the tri-star topology.
Table 4-4 shows the supported topologies and topology subsets, including the
ServerNet node numbers used by each combination. You can expand a topology
online, but upgrading from one topology to another requires temporarily disrupting
ServerNet connectivity one fabric at a time.
Note. Section 2, Planning for Installation includes additional considerations for choosing a
topology.
If the cluster needs to support . . . Choose this topology
Up to 16 nodes Split-star
Up to 24 nodes Tri-star
Table 4-4. Supported Topologies, Cluster Switch Positions, and ServerNet Node
Numbers
Topology
Full
Topology
or Subset
Cluster
Switches
Per Fabric Cluster Switches
Supports ServerNet
node numbers . . .
Star Full 1 X1/Y1 1 through 8
Split-star Full 2 X1/Y1 and X2/Y2 1 through 16
Subset 1 X1/Y1 1 through 8
Subset 1 X2/Y2 9 through 16
Tri-star Full 3 X1/Y1, X2/Y2, and X3/Y3 1 through 24
Subset 2 X1/Y1 and X2/Y2 1 through 16
Subset 2 X1/Y1 and X3/Y3 1 through 8 and
17 through 24
Subset 2 X2/Y2 and X3/Y3 9 through 24
Subset 1 X1/Y1 1 through 8
Subset 1 X2/Y2 9 through 16
Subset 1 X3/Y3 17 through 24