R0106-HP MSR Router Series High Availability Configuration Guide(V7)

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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.
Feature and hardware compatibility
The following matrix shows the feature and hardware compatibility:
Hardware Process
p
lacement com
p
atibilit
y
MSR2000 No
MSR3000 No
MSR4000 Yes
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 does the following:
• Improves service availability.
• Enables the system to quickly regain reliability after device status changes, for example, 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.