Expand Configuration and Management Manual (G06.24+)

Managing the Network
Expand Configuration and Management Manual—523347-008
19-27
Rebalancing Multi-CPU Paths
Rebalancing Multi-CPU Paths
The SCF interface to the Expand subsystem provides commands to rebalance multi-
CPU paths. You can schedule load balancing to occur automatically at periodic
intervals using the SCF ALTER PROCESS $NCP command, or you can manually
initiate load balancing using the SCF ACTIVATE PROCESS $NCP command.
Exactly when you should rebalance a multi-CPU path depends on the volatility of the
traffic pattern. For example:
•
If the traffic pattern is nearly constant, then load balancing can be initiated once
after a change in the status of the multi-CPU path.
•
If the pattern changes somewhat during the day, but slowly from day to day, then
load balancing should be done once a day during off-peak hours.
•
If the pattern changes radically, load balancing should be done an hour or so into
each new traffic pattern to establish new path assignments.
For more information on load balancing, refer to Load Balancing on page 20-16.
Table 19-12. Expand SCF Commands for Switching Processors
SCF Command Action Performed
PRIMARY PROCESS $device_name Causes the backup process to become the
primary process, or the primary process to
become the backup process, for a selected
Expand line-handler process.
PRIMARY PROCESS $NCP Causes the backup process to become the
primary process, or the primary process to the
backup process, for $NCP.