Brocade Virtual ADX Server Load Balancing Guide (Supporting ADX v03.1.00) - Manual (Page 45)

Brocade Virtual ADX Server Load Balancing Guide 29
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Real server ports
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When you enable this feature, the Brocade Virtual ADX resets the connection for an unavailable
TCP or UDP application on a real server in addition to redirecting future requests away from this
real server.
To enable the feature, enter commands such as the following:
The above example enables the feature for the http application defined under the virtual server.
Similarly, this feature can be enabled for the other application ports as well.
Syntax: [no] port application-port reset-on-port-fail
Slow-start mechanism
When the Brocade Virtual ADX begins sending client requests to a real server that has recently
gone online, it allows the server to ramp up by using the slow-start mechanism. The slow-start
mechanism allows a server (or a port on the server) to handle a limited number of connections at
first and then gradually handle an increasing number of connections until the maximum is
reached.
The Brocade Virtual ADX uses two kinds of slow-start mechanisms:
• The non-configurable server slow-start mechanism applies to a real server that has just gone
online.
• The configurable port slow-start mechanism applies to individual TCP application ports that
have just been activated on a real server.
Refer to “Slow-start mechanism” on page 225 for more information.
Enabling or disabling the keepalive health check
When you configure a port profile for an application port, the L4/L7 keepalive health check for that
port is enabled automatically. You also can enable or disable the keepalive health check for an
application port on a specific real server, without affecting the global setting for the health check.
NOTE
If you configured a port profile for the port, the keepalive health check is enabled.
To enable the keepalive health check, enter commands such as the following.
Virtual ADX(config)#server real Auto_Plooker 192.168.2.69
Virtual ADX(config-rs-Auto_Plooker)#port http keepalive
To disable the keepalive health check, enter commands such as the following.
Virtual ADX(config)#server real Auto_Plooker 192.168.2.69
Virtual ADX(config-rs-Auto_Plooker)#no port http keepalive
Syntax: [no] port tcp/udp-port keepalive
Virtual ADX(config)#server virtual vip-test 10.50.1.250
Virtual ADX(config-vs-vip-test)#port http
Virtual ADX(config-vs-vip-test)#port http reset-on-port-fail
Virtual ADX(config-vs-vip-test)#