policy. For example, if a server’s active connection count and server agent values are high,
Equalizer might not dispatch new requests to that server even if that server’s response time
is the fastest in the cluster.
l
Least Cxns
(least connections) load balancing - dispatches the highest percentage of
requests to the server with the least number of active connections. In the same way as Fast-
est Response, Equalizer tries to avoid overloading the server so it checks the server’s
response time and server agent value. Least Connections optimizes the balance of con-
nections to servers in the cluster.
l
Server Agent
load balancing - dispatches the highest percentage of requests to the server
with the lowest server agent value. In a similar way to Fastest Response, Equalizer tries to
avoid overloading the server by checking the number of connections and response time.
This method only works if the server agents are running on every server instance in the
server pool.
l
Custom
load balancing - If custom is selected, you can adjust the load balancing policy para-
meters:
o
Delay weight
The relative influence on the policy of the current response time
between Equalizer and the server.
o
Active Connections Weight
- The relative influence on the policy of the number of
active connections currently open to a server
o
Agent Weight
- The relative influence on the policy of the return value of a server
agent (if any) running on the servers in the cluster.
o
VM CPU
- For servers that are associated with VMware Virtual Machines, the rel-
ative influence on the policy of the VM CPU usage status returned by VMware.
Displayed only if VLB Advanced is licensed and VLB is enabled for this cluster
o
VM RAM
- For servers that are associated with VMware Virtual Machines, the rel-
ative influence on the policy of the VM RAM usage status returned by VMware.
Displayed only if VLB Advanced is licensed and VLB is enabled for this cluster.
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 dif-
ference between the dynamic weight and the initial weight increases.
Copyright © 2014 Coyote Point Systems, A Subsidiary of Fortinet, Inc.
All Rights Reserved.
433
Equalizer Administration Guide
Summary of Contents for Equalizer GX Series
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