HP SuperStack 3 Load Balancer Appliance Manual do Utilizador descarregar pdf (Página 70)

70 CHAPTER 8: CONFIGURING FOR LOAD BALANCING

6 Choose a balancing algorithm. The default balance profile is

Round-robin. Table 11 describes the available algorithms.

Ta b l e 11 Supported Algorithms and Descriptions

Supported Algorithms Description

Round Robin Each new connection is assigned to the next server in

the list. This distributes connections evenly between

the servers.

Weighted Round Robin Similar to Round Robin, except that N consecutive new

connections are assigned to a server before selecting

the next server in the list, where N is the weight

assigned to the server. Servers with higher

performance or capacity should be assigned higher

weight.

The weight assigned to the server is assigned using the

Assign server to service (Advanced)... window. A

weight field is provided.

Least Connections Each new connection is assigned to the server having

the fewest number of open connections. If several

servers have the same low number of open

connections, then the new connection is sent to the

server that was least recently sent a new connection

Weighted Least

Connections

Similar to Least Connections, except that N consecutive

new connections are assigned to a server before next

selecting the server with the least number of open

connections, where N is the weight assigned to the

server

Quickest Last Response When a new connection is established between a

client and server, the Server Load Balancer monitors

the client's first request for data. When the server

responds to the initial request, the Server Load

Balancer notes the time delay between the request and

the response and stores that value as the server's

response time. Each new connection is sent to the

server having the fastest response time.

Since server response time changes dynamically, a

decay algorithm is applied periodically to all response

times to prevent a server from being locked out after

one long response delay

Quickest Average

Response

Similar to Quickest Last Response, except the response

time is averaged over approximately the last eight

measurements for the server. A decay algorithm is also

applied to the average response times

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