Coyote Point Systems E350GX, Installation And Administration Manual

Page: 256 / 344

Chapter 9: Administering GeoClusters
252 Equalizer Installation and Administration Guide
3. Click the
commit
button to save any changes you made to the Site configuration.
4. Click on the
Resources
tab, to update the following resource parameters:
If
V8
is selected, the following parameter is displayed:
If
V7
is selected, the following parameters are displayed:
weight
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 percentage 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 initial
weights to 100 and 200.
Dynamic site weights can vary from 50% to 150% of the assigned initial
weights. To optimize 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.
default site
Designates this site as the default site for the GeoCluster. Envoy load balances
to the default site whenever it cannot choose a site based on the GQP probe
information it gets from the sites. This can happen, for example, when GQP
probe responses are not received from any site, when the resource (cluster) is
down at all available sites, etc. If no default site is selected for a GeoCluster
and all sites are down, then Envoy sends a null response to the client DNS.
See the explanation in Step 4b on page 241.
name
If the Equalizer at this site is running Version 8 or higher of the Equalizer
software, specify the cluster name. Equalizer will query the Envoy agent at that
site for the cluster’s IP address and port. Leave blank if the site is running
Version 7.
ip
If the Equalizer at the site is running Version 7 of the Equalizer
software, specify the cluster’s IP address (and port, below). It is
generally the same value as the site IP address, unless the site
address is NAT’ed to a cluster IP. Leave blank if the site is
running Version 8.