16.3 Choosing which nodes Moab powers on or off
Context
Moab can use the GREENPOOLPRIORITYF function to determine which nodes to power on or off. The PRIORITY node allocation policy is used to determine which nodes to allocate workload to. When Moab can no longer allocate workload to available nodes, it begins to power nodes on in the order specified by the GREENPOOLPRIORITYF function.
To choose which nodes Moab powers on or off
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Set a GREENPOOLPRIORITYF function to describe which order nodes should be selected for power on/off actions. GREENPOOLPRIORITYF uses the PRIORITY node allocation policy options and syntax.
GREENPOOLPRIORITYF '10*RANDOM'
This tells Moab to randomly choose a node to power on to meet workload demands, and to randomly choose an idle node to power off to meet the MAXGREENSTANDBYPOOLSIZE goal.
To choose which nodes Moab allocates jobs to
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Set a PRIORITY node allocation policy that uses power as the major factor. This causes Moab to allocate jobs to nodes that are already powered on. When no nodes are available to meet this policy, Moab uses the GREENPOOLPRIORITYF function to turn on nodes that are powered off.
NODEALLOCATIONPOLICY PRIORITY NODECFG[DEFAULT] PRIORITYF='10000*POWER + 10*RANDOM'
The nodes with the highest priority for workload are the nodes that are powered on. After that, Moab randomly allocates workload.
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