Equalizer Vlb Basic; Using Vlb Basic - Coyote Point Systems E350GX Installation And Administration Manual

Appendix F: Equalizer VLB

Equalizer VLB Basic

Equalizer VLB Basic uses VMware's management API to retrieve real-time virtual server performance information
from a VMware vCenter console that manages virtual machines running on ESX Server (or from a single ESX
Server directly). The additional server availability and resource utilization information obtained from VMware
allows Coyote Point's Equalizer™ traffic management appliance to more efficiently direct the traffic flowing to
VMware virtual machines. The diagram below illustrates how Equalizer VLB works:
Equalizer extracts information from VMware using the VMware API and load balances requests across virtual
machines using knowledge of what is going on inside each virtual machine. If there is only one ESX Server in your
configuration, Equalizer can also be set up to communicate directly with the ESX Server (instead of VSphere or
vCenter), and load balance among the virtual machines defined on that ESX Server only.
Equalizer uses statistics such as the amount of memory in use by a virtual machine, the amount of memory in use by
all virtual machines on the physical host, and CPU utilization to automatically distribute incoming cluster requests to
the virtual machines added to the cluster. Response to changes in VMware configuration is dynamic. If the virtual
server performance in the pool is uneven, Equalizer automatically detects the uneven latency and sends new traffic
to the best available virtual machine. If a server is overloaded and reboots, Equalizer simply detects that the server is
available again, and automatically resumes sending traffic to it.

Using VLB Basic

Typically, VLB is used in the following manner:
1. Provide VMware login information and enable VLB on the global
2. For each cluster that contains (or will contain) servers that are VMware Virtual Machines:
a. Enable VLB agents on the cluster
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tab.
Probe
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VLB
Equalizer Installation and Administration Guide