Equalizer’s Load Balancing Response Settings
The
responsiveness
setting controls how aggressively Equalizer adjusts the servers’ dynamic
weights. Equalizer provides five response settings: Slowest, Slow, Medium, Fast, and Fastest. The
response setting affects the dynamic weight spread, weight spread coefficient, and optimization
threshold that Equalizer uses when it performs adaptive load balancing:
l
Dynamic Weight Spread
indicates how far a server’s dynamic weight can vary (or
spread
) from its initial weight.
l
Weight Spread Coefficient
regulates the speed of change to a server’s dynamic weight.
The weight spread coefficient causes dynamic weight changes to happen more slowly as the
difference between the dynamic weight and the initial weight increases.
l
Optimization Threshold
controls how frequently Equalizer adjusts dynamic weights. If
Equalizer adjusts server weights too aggressively, oscillations in server weights can occur
and cluster-wide performance can suffer. On the other hand, if Equalizer does not adjust
weights often enough, server overloads might not be compensated for quickly enough and
cluster-wide performance can suffer.
Aggressive Load Balancing
After you fine-tune the initial weights of each server in the cluster, you might discover that
Equalizer is not adjusting the dynamic weights of the servers at all: the dynamic weights are very
stable, even under a heavy load. In this case, you might want to set the cluster’s load balancing
response parameter to fast so that Equalizer tries to optimize the performance of your servers
more aggressively. This should improve the overall cluster performance.
Dynamic Weight Oscillations
If you notice a particular server’s dynamic weight oscillates (for example, the dynamic weight
varies from far below 100 to far above 100 and back again), you might benefit by choosing slow
response for the cluster. You should also investigate the reason for this behavior; it is possible
that the server application is behaving erratically.
Copyright © 2014 Coyote Point Systems, A Subsidiary of Fortinet, Inc.
All Rights Reserved.
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Equalizer Administration Guide
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