Coyote Point Systems Equalizer, Installation And Administration Manual

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Working with Virtual Clusters
Equalizer Installation and Administration Guide 65
To change a cluster’s load-balancing options:
1. Log into the Equalizer Administration interface with edit access.
2. In the left frame, click the name of the cluster whose parameters you want to change.
The Cluster Parameters are displayed in the right frame.
3. Select Change Cluster Parameters from the local menu in the Cluster Parameters
frame. The Change Cluster dialog is displayed in the right frame.
Figure 47 Changing load balancing options
4. Select a Load Balancing Method. The load balancing method determines which
algorithm Equalizer will use to determine how to distribute requests among the
servers in the cluster.
Equalizer supports six load balancing methods:
■
Round Robin —requests are distributed equally among all of the servers in the
cluster. The first incoming request is dispatched to the first server, the second to
the second server, and so on. When the last server is reached, the cycle repeats. If
Equalizer detects that a server in the cluster is DOWN, no requests are
dispatched to that server.
The round-robin load balancing policy does not take advantage of Equalizer’s
Adaptive Load Balancing feature. The static weights of the servers are ignored
and Equalizer does not attempt to dynamically adjust server weights based on
server performance.
■
Static Weight —requests are distributed among the servers according to their
static weights. A server with a higher static weight will get a higher percentage
of the incoming requests. This can be thought of as a Weighted Round Robin
implementation. It does not take advantage of Equalizer’s Adaptive Load
Balancing feature and the server weights are not dynamically adjusted based on
server performance.