Coyote Point Systems Equalizer Especificaciones descargar pdf (Pagina 174)

Load Balancing Policy Description

static weight

static weight load balancing distributes requests among the servers

depending on their assigned initial weights. A server with a higher initial weight

gets a higher percentage of the incoming requests. Thinkof thismethod as

aweighted round robin implementation. Static weight load balancing does not

support Equalizer’s adaptive load balancing feature; Equalizer does not

dynamically adjust server weights based on server performance.

adaptive

adaptive load balancing distributes the load according to the following

performance indicators for each server.

Server response time isthe length of time for the server to

begin sending reply packets after Equalizer sends a request.

Active connection count shows the number of connections

currently active on the server.

Server agent value isthe value returned by the server agent

daemon (if any) running on the server.

fastest response load balancing

fastest response load balancingdispatches the highest percentage of

requeststo the server with the shortest response time. Equalizer does this

carefully: if Equalizer sends too many requeststo 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

requeststo that server even if that server’s response time is the fastest in the

cluster.

least connections load balancing

dispatches

least connections load balancing dispatchesthe highest percentage of

requeststo 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 server pool in the cluster.

server agent load balancing dispatches

server agent load balancing dispatchesthe highest percentage of requests

to the server with the lowest server agent value. In a similar way to Fastest

Response, Equalizer triesto avoid overloading the server by checking the

number of connections and response time. This method only works if server

agents are running on the server pool in the 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:

Dynamic Weight Spread indicates how far a server’s dynamic weight can vary (or

spread

) from its

initial weight.

Weight Spread Coefficient regulates the speed of change to a server’s dynamic weight. The weight

spread coefficient causes dynamic weight changes to happen more slowly as the difference between the

dynamic weight and the initial weight increases.

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