Technical data

Brocade ServerIron ADX Advanced Server Load Balancing Guide 65
53-1003441-01
Other transparent cache switching options
2
Configuring the connection rate control
Connection rate control enables you to limit the connection rate to a cache server. The ServerIron
ADX limits the number of new port connections per second to the number you specify.
The ServerIron ADX increments the connection counter for cache connections only after the
ServerIron ADX selects one for the connection. If the ServerIron ADX cannot serve a client request
because a cache already has the maximum number of connections for the current second for the
requested port, the ServerIron ADX tries another cache. If there are no caches available, the
ServerIron ADX directs the request to the Internet.
If you configure a limit for TCP and also for an individual application port, the ServerIron ADX uses
the lower limit. For example, if you limit new TCP connections to a real server to 1000 per second
and also limit new HTTP connections to 600 per second, the ServerIron ADX limits connections to
TCP port HTTP to 600 per second.
NOTE
The ServerIron ADX counts only the new connections that remain in effect at the end of the
one-second interval. If a connection is opened and terminated within the interval, the ServerIron ADX
does not include the connection in the total for the server.
To limit the number of new TCP connections a cache can receive each second, enter commands
such as the following.
ServerIronADX(config)#server cache-name C1 10.6.7.8
ServerIronADX(config-rs-C1)#max-tcp-conn-rate 2000
Syntax: max-tcp-conn-rate num
The num variable specifies the maximum number of connections per second. There is no default.
Syntax: port TCP/UDP-portnum max-tcp-conn-rate num
The TCP/UDP-portnum variable specifies the application port.
The num variable specifies the maximum number of connections per second.
You also can specify the connection rate for an individual port.
ServerIronADX(config)#server cache-name C1 10.6.7.8
ServerIronADX(config-rs-C1)#port http
ServerIronADX(config-rs-C1)#port http max-tcp-conn-rate 2000
Setting the cache server weight
You can assign a performance weight to each server. Servers assigned a higher weight receive a
larger percentage of connections.
To set the weight for cache server1 to 5 from the default value of 1, enter the following commands.
ServerIronADX(config)#server cache-name server1
ServerIronADX(config-rs-server1)#weight 5
Syntax: weight server-weight
The server-weight variable may have any value from 1 though 8. The default value is 1. In releases
prior to 12.2.01j, the range of values is 1 through 65000.