H3C Technologies H3C MSR 5600 - Manual (Page 93)

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Configuring process placement
Overview
Process placement enables placing processes to specific CPUs (also called "nodes") on the main
processing units (MPUs) in your system for optimal distribution of CPU and memory resources.
Process
A process comprises a set of codes and provides specific functionality. For example, an AAA process
provides AAA functions.
Each process runs in a protected memory space to prevent problems with one process from impacting the
entire system.
1:N process redundancy
The system backs up each active process running on one node to all the other nodes. When an active
process fails, one of its standby processes promptly takes over without impacting any other service.
This 1:N process redundancy improves service availability and enables the system to quickly regain
reliability after the device status changes including insertion and removal of cards.
Process placement policy and optimization
Process placement policies
For an active process running on only the active MPU, it does not support placement optimization (by
displaying a configuration failure prompt). When such an active process fails, the system automatically
restarts the process. The standby processes are used for active/standby switchover and ISSU.
Some active processes can run on either the active or standby MPU. When such an active process fails,
the system uses a placement policy to select a new active process among standby processes.
The system provides a default process placement policy that takes effect for all processes. You can modify
the default placement policy in the view you enter with the placement program default command. You
can also configure a placement policy for a specific process in the view you enter with the placement
program program-name [ instance instance-name ] command. A placement policy for a process takes
precedence over the default process placement policy.
By default, the default process placement policy defines the following rules:
• The active process runs on the main CPU of the active MPU, and the standby processes run on other
CPUs. (MSR 5600)
• A process runs at the location where it ran the last time and does not move to any other location
during startup or operation.