Coyote Point Systems Equalizer Especificaciones descargar pdf (Pagina 231)

server.

l Response load balancing - dispatches the highest percentage of requests to the server with the shortest

response time. Equalizer does this carefully: if Equalizer sends too many requests to a server, the result

can be an overloaded server with slower response time. The fastest response policy optimizes the cluster-

wide response time. The fastest response policy also checks the number of active connections and server

agent values (if configured); but both of these have less of an influence than they do under the adaptive load

balancing 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 Fastest 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 connections 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 parameters:

Delay weight The relative influence on the policy of the current response time between

Equalizer and the server.

Active Connections Weight - The relative influence on the policy of the number of active

connections currently open to a server

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.

VM CPU - For servers that are associated with VMware Virtual Machines, the relative

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

VM RAM - For servers that are associated with VMware Virtual Machines, the relative

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.

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Equalizer Administration Guide

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Coyote Point Systems Equalizer Especificaciones Pagina 231