Resource management policies
The resource management policy for each partition group is specified in a policy file that defines both the managed environment and the parameters of the resource management policy.
For each resource, there is an upper and lower load threshold. Every time a threshold is crossed, PLM receives a Resource Management and Control (RMC) event. When the load on the resource is above the upper threshold, the partition PLM considers the partition in need of additional resources; the partition is said to be a requestor. When the load on the resource is below the lower threshold, the partition becomes a potential donor. Normally, resources are only removed from donors when another partition enters the requestor state for the same resource. When the load on the resource is between the two thresholds, PLM considers that the resources available are adequate.
The policies are defined by a policy file, which can be created using a wizard or by manually editing a file. If you edit the PLM policy by hand, be advised that the file has a strict, stanza-based structure. If this structure is not respected, then PLM will not be able to use it. Make a copy of a known "good" file and only edit the copy. You can use the command...
xlplm -C -p policy_fileTo define a PLM policy...
- Create a new policy file.
- Define the global environment and, optionally, the global tunables.
- Define the partition groups and, optionally, the group tunables.
- Add partitions to the groups and, optionally, define the partition tunables.
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