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Pools

BIG-IP® Reference Guide 4-7

Least Connections

Least Connections mode is relatively simple in that the BIG-IP passes a new

connection to the node that has the least number of current connections.

Least Connections mode works best in environments where the servers or

other equipment you are load balancing have similar capabilities.

This is a dynamic load balancing mode, distributing connections based on

various aspects of real-time server performance analysis, such as the current

number of connections per node or the fastest node response time.

Load balancing calculations may be localized to each pool (member-based

calculation) or they may apply to all pools of which a server is a member

(node-based calculation). The variant of the mode using member-based

calculation is distinguished by the extension least_conn_member.

Observed

Observed mode uses a combination of the logic used in the Least

Connection and Fastest modes. In Observed mode, nodes are ranked based

on a combination of the number of current connections and the response

time. Nodes that have a better balance of fewest connections and fastest

response time receive a greater proportion of the connections. Observed

mode also works well in any environment, but may be particularly useful in

environments where node performance varies significantly.

This is a dynamic load balancing mode, distributing connections based on

various aspects of real-time server performance analysis, such as the current

number of connections per node or the fastest node response time.

Load balancing calculations may be localized to each pool (member-based

calculation) or they may apply to all pools of which a server is a member

(node-based calculation). The variant of the mode using member-based

calculation is distinguished by the extension observed_member.

Predictive

Predictive mode also uses the ranking methods used by Observed mode,

where nodes are rated according to a combination of the number of current

connections and the response time. However, in Predictive mode, the

BIG-IP analyzes the trend of the ranking over time, determining whether a

node’s performance is currently improving or declining. The nodes with

better performance rankings that are currently improving, rather than

declining, receive a higher proportion of the connections. Predictive mode

works well in any environment.

This is a dynamic load balancing mode, distributing connections based on

various aspects of real-time server performance analysis, such as the current

number of connections per node or the fastest node response time.

Load balancing calculations may be localized to each pool (member-based

calculation) or they may apply to all pools of which a server is a member

(node-based calculation). The variant of the mode using member-based

calculation is distinguished by the extension predictive_member.

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