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Pools

BIG-IP® Reference Guide 4-5

Pool Name

The most basic attribute you can configure for a pool is the pool name. Pool

names are case-sensitive and may contain letters, numbers, and underscores

(_) only. Reserved keywords are not allowed.

Each pool that you define must have a unique name.

Member specification

For each pool that you create, you must specify the nodes that are to be

members of that pool. Nodes must be specified by their IP addresses.

Load balancing method

Load balancing is an integral part of the BIG-IP. Configuring load balancing

on the BIG-IP means determining your load balancing scenario, that is,

which node should receive a connection hosted by a particular virtual server.

Once you have decided on a load balancing scenario, you can specify the

appropriate load balancing method for that scenario.

The load balancing method is a pool attribute and consists of two properties:

the load-balancing mode and priority-based activation.

Load balancing modes

A load balancing mode is an algorithm or formula that the BIG-IP uses to

deterimine the node to which traffic will be sent. Individual load balancing

modes take into account one or more dynamic factors, such as current

connection count. Because each application of the BIG-IP is unique, and

node performance depends on a number of different factors, we recommend

that you experiment with different load balancing modes, and select the one

that offers the best performance in your particular environment.

The default load balancing mode on the BIG-IP is Round Robin, which

simply passes each new connection request to the next server in line. All

other load balancing modes take server capacity and/or status into

consideration.

If the equipment that you are load balancing is roughly equal in processing

speed and memory, Round Robin mode works well in most configurations.

If you want to use the Round Robin mode, you can skip the remainder of

this section, and begin configuring other pool attributes that you want to add

to the basic pool configuration.

If you are working with servers that differ significantly in processing speed

and memory, you may want to switch to Ratio mode or to one of the

dynamic modes.

The individual load balancing modes are as follows.

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