Managing HP Serviceguard A.12.00.00 for Linux, June 2014

• the package configuration file
• the cmmakepkg (1m) manpage
• the section “Package Parameter Explanations” (page 184) in this manual.
For further discussion and use cases, see the white paper Using Serviceguard’s Node Capacity
and Package Weight Feature at http://www.hp.com/go/linux-serviceguard-docs.
4.9.10.7 How Package Weights Interact with Package Priorities and Dependencies
If necessary, Serviceguard will halt a running lower-priority package that has weight to make room
for a higher-priority package that has weight. But a running package that has no priority (that is,
its priority is set to the default, no_priority) will not be halted to make room for a down
package that has no priority. Between two down packages without priority, Serviceguard will
decide which package to start if it cannot start them both because there is not enough node capacity
to support their weight.
4.9.10.7.1 Example 1
• pkg1 is configured to run on nodes turkey and griffon. It has a weight of 1 and a priority
of 10. It is down and has switching disabled.
• pkg2 is configured to run on nodes turkey and griffon. It has a weight of 1 and a priority
of 20. It is running on node turkey and has switching enabled.
• turkey and griffon can run one package each (package_limit is set to 1).
If you enable switching for pkg1, Serviceguard will halt the lower-priority pkg2 on turkey. It
will then start pkg1 on turkey and restart pkg2 on griffon.
If neither pkg1 nor pkg2 had priority, pkg2 would continue running on turkey and pkg1 would
run on griffon.
4.9.10.7.2 Example 2
• pkg1 is configured to run on nodes turkey and griffon. It has a weight of 1 and a priority
of 10. It is running on node turkey and has switching enabled.
• pkg2 is configured to run on nodes turkey and griffon. It has a weight of 1 and a priority
of 20. It is running on node turkey and has switching enabled.
• pkg3 is configured to run on nodes turkey and griffon. It has a weight of 1 and a priority
of 30. It is down and has switching disabled.
• pkg3 has a same_node dependency on pkg2
• turkey and griffon can run two packages each (package_limit is set to 2).
If you enable switching for pkg3, it will stay down because pkg2, the package it depends on, is
running on node turkey, which is already running two packages (its capacity limit). pkg3 has
a lower priority than pkg2, so it cannot drag it to griffon where they both can run.
4.9.10.8 Serviceguard Load Sensitive Placement
When you configure load balancing, Serviceguard places the packages in a load sensitive mode.
While starting the packages, Serviceguard places the packages on the nodes to distribute the
weights evenly on all the nodes.
4.9 Package Configuration Planning 125