ServerNet Cluster Manual

Upgrading a ServerNet Cluster
ServerNet Cluster Manual—520575-003
4-90
Fallback for Merging a Split-Star Topology and a Star
Topology to Create a Tri-Star Topology
split-star configuration provides greater throughput than a subset of a tri-star
topology. But the tri-star subset facilitates expansion to 24 nodes. For information
about the topologies, refer to Planning for the Topology on page 2-8.
•
Disconnects the two-lane links one fabric at a time.
•
Connects four-lane links one fabric at a time to the split-star topology.
1. Identify the star group that will leave the cluster when the tri-star topology is
disconnected. This star group can function as a subset of a tri-star topology using
only one cluster switch per fabric. The other two star groups will function as a split-
star topology when the tri-star topology is disconnected.
You can use Table 4-22 on page 4-75 to record information about the star groups
and nodes.
2. On the star group that will leave the cluster, abort the Expand-over-ServerNet lines:
a. On all nodes in the star group that will leave the cluster, abort the Expand-over-
ServerNet lines to the nodes in the two star groups that will form the split-star
topology. For example:
>SCF ABORT LINE $SC021
b. On all nodes that will populate the split-star topology, abort the Expand-over-
ServerNet lines to the nodes in the star group that will leave the cluster.
c. Optionally, stop and delete the Expand-over-ServerNet line-handler processes.
3. On one of the star groups that will make up the split-star topology, use the TSM
Configuration Update action to download a split-star configuration to the X-fabric
cluster switch:
a. In the Management window, click the Cluster tab to view information about the
ServerNet cluster.
b. In the tree pane, right-click the X-fabric Switch resource, and select Actions.
The Actions dialog box appears.
Note. If you need to separate the star groups in a split-star or tri-star topology but do not need
to change the topology or the configuration used by individual star groups, refer to Splitting a
Large Cluster Into Multiple Smaller Clusters on page 6-11.
Note. You do not need to download new firmware or a new configuration to the
cluster switches for the star group that will leave the cluster. The star group can
function as a subset of the tri-star topology. Even if you download a new configuration,
HP recommends using T0569AAE (or superseding) firmware. If your applications
require falling back to an earlier RVU, refer to Fallback for Upgrading Software to
Obtain G06.14 Functionality on page 4-50.
Note. Backward migration of the firmware is recommended only in exceptional cases. The
T0569AAE firmware is backward compatible with all ServerNet cluster releases, supports
all three topologies, and contains significant defect repair.