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Using the statistical model

The statistical load balancing model uses load values that you specified to determine a target datastore.

A load is the weighting factor that is assigned to a datastore for load balancing. The statistical model allows you to assign a load (0 through 100) to each datastore to specify how the workload is distributed among the active datastores. These loads take the place of WLM.

When you assign a weighted value to a datastore, an algorithm converts the weight (1 through 100) to a goal percentage. The default is 1. Only active datastores are considered when setting goal percentages. For information about setting load balancing weights for datastores, see Defining-load-balancing-weights.

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Warning

The load balancing method affects which datastores are considered active during the first cycle after IMS Connect is started:

  • With the statistical method, datastores are considered active when goal percentages are calculated.
  • With the WLM method, messages are sent after the first specified cycle time. This happens because the datastore status is undetermined at that time.
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Tip

Because goal percentages are calculated only at the beginning of each routing cycle, BMC Software recommends that you set the load balancing cycle time between 1 and 3 minutes. If the cycle time is too high, Energizer will not include a newly activated datastore until the next cycle.

Use the statistical method when more than one datastore resides on the same image and you want to control the individual load going to those datastores.

The following examples show how the goal percentage is calculated in a 2-minute cycle with datastores becoming inactive and active within a cycle. The Affinity Manager is inactive.

Related topic

Load-Balancer

 

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Energizer for IMS Connect 1.7