Coyote Point Systems Equalizer GX Series, Administration Manual

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Global Load Balance
b. Right click on a GeoCluster on the left navigational pane and select Add GeoSite
Instance. The Add GeoSite Instance form will be displayed. If this method is
used, you will need to enter the
GeoSite IP Address
and select the desired GeoSite
using the
GeoSite Name
drop down list.
4. In both methods of creating GeoSite Instances the
GeoSite IP Address
is required. This is the
IP address returned by DNS to a client when the GeoCluster is accessed. For example, when
a client opens
www.coyotepoint.com
, the local DNS server returns an A record that con-
tains the IP address for
www.coyotepoint.com
. This is usually the address of an Equal-
izer cluster and in this case is also used as the resource IP. However, the site’s A record IP
may be different from the cluster (resource) IP if the A record IP address is NAT’ed to an
internal address (the actual cluster IP). In this case, you specify the A record IP as the site
IP and the cluster IP as the resource IP.
5. Using the slider on either form, adjust the
Weight
, which is an integer that represents the
site’s capacity. (This value is similar to a server’s initial weight.) Valid values range
between 10 and 200. Use the default of 100 if all sites are configured similarly; otherwise,
adjust higher or lower for sites that have more or less capacity.
Equalizer uses a site’s initial weight as the starting point for determining what percentage of
requests to route to that site. Equalizer assigns sites with a higher initial weight a higher per-
centage of the load. The relative values of site initial weights are more important than the
actual values. For example, if two sites are in a GeoCluster and one has roughly twice the
capacity of the other, setting the initial weights to 50 and 100 is equivalent to setting the ini-
tial weights to 100 and 200.
Dynamic site weights can vary from 50% to 150% of the assigned initial weights. To optim-
ize GeoCluster performance, you might need to adjust the initial weights of the sites in the
cluster based on their performance.
Site weights can range from 10 to 200. When you set up sites in a GeoCluster, you should
set each site’s initial weight value in proportion to its capacity for handling requests. It is
not necessary for all of the initial weights in a cluster to add up to any particular number.
6. Click on
Commit
to add the GeoSite instance. The instance will appear beneath the
GeoCluster on the left navigational pane as shown below.
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