ServerNet Cluster Manual

Upgrading a ServerNet Cluster
ServerNet Cluster Manual—520575-003
4-67
Fallback for Merging Clusters to Create a Split-Star
To p ol ogy
6. If necessary, use one of the fallback procedures in Upgrading Software to Obtain
G06.12 Functionality on page 4-17 to fall back from G06.12 to an earlier RVU in
each of the two physically independent clusters.
7. In all nodes of the star group selected in Step 1:
a. Use the SCF START SUBSYS $ZZSCL command to bring up direct ServerNet
connectivity between the nodes.
b. Start the Expand-over-ServerNet lines to the other nodes in the star group.
c. If desired, start any applications that utilize ServerNet connectivity to nodes
within the star group.
Note. If the cluster switch is currently running T0569AAA firmware, updating the
configuration can change the fabric setting. The fabric setting (X or Y) changes to a default
setting (X) when the T0569AAA configuration is loaded in the switch. The T0569AAA
configuration normally should be loaded on the cluster switch only when a configuration
fallback is being performed.
If the cluster switch is installed on the external Y fabric, you must reconfigure the fabric
setting in the cluster switch back to Y after the fallback. Until you perform this action,
ServerNet traffic through the cluster switch remains disabled.
You can use the Set LED to { X | Y } Side action in the TSM Service Application to correct
the fabric setting.
If the cluster switch is currently running T0569AAB firmware, the configured fabric setting
(X or Y) remains unchanged when either the T0569AAA (fallback) or the T0569AAB
configuration is loaded in the cluster switch.