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Server Pools and Server Instances

For example, you might configure a server as a hot spare if you are using

licensed software on your servers and the license allows you to run the

software only on one node at a time. In this situation, you could configure

the software on two servers in the cluster and then configure one of those

servers as a hot spare. Equalizer will use the second server only if the first

goes down, enabling you to make your application available without

violating the licensing terms or having to purchase two software licenses.

Override Persistence

Disables persistence for the server when the persist flag (Layer 7 cluster)

or a non-zero sticky time (Layer 4 cluster) is set on a cluster. For a Layer 7

cluster, this means that a cookie will not be inserted into the response

header when returned to the client. No sticky record is set for a Layer 4

cluster. This flag is usually used to disable persistence for a hot spare.

Quiesce

When enabled, Equalizer avoids sending new requests to the server. This

is usually used in preparation for shutting down an HTTP or HTTPS server,

and is sometimes also called “server draining”. Refer to "Shutting Down a

Server Gracefully" on page 256.

Probe Layer 4

This flag enables or disables Layer 4 TCP and ACV probes for this server.

By default this flag is enabled.

Strict Max Cx

This flag allows you to customize the behavior of the max connections

parameter (see above).

When Strict Max Cx is enabled (the default), the max connections

parameter is interpreted as a strict maximum and is never overridden. If a

client attempts to connect to a server that has a number of connections

equal to the max connections setting, then the connection is refused.

When Strict Max Cx is disabled, the max connections setting will be

overridden in any of the following circumstances:

l A client attempts to connect to a server with the hot spare flag enabled - this allows hot spares to service

more than the max connections setting of connections.

l A client attempting to connect to a Layer 7 cluster has a persistence cookie and the server identified in the

cookie has already reached its max connections limit.

l A client attempting to connect to a Layer 4 cluster has an existing sticky persistence connection to a server

and that server has already reached its max connections limit.

6. Repeat step 3 to add additional server instances to a server pool.

Server Instance Summary Screen

The Server Instance Summary Screen is displayed when a server instance is selected from the left navigational

pane. It displays Server Instance details such as Active Connections, Connections/second and Transactions per

second as well as server pool configuration parameters and a graphical representation of performance history from

the last 30 minutes.

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