Brocade Virtual ADX Server Load Balancing Guide (Supporting ADX v03.1.00) User Manual
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Brocade Virtual ADX Server Load Balancing Guide
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Miscellaneous health check settings
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When a port on a real server becomes active, the Brocade Virtual ADX applies the default
slow-start mechanism to regulate how quickly connections for the port are established. In addition,
you can set up a user-configured slow-start mechanism that regulates how quickly connections are
established for specific ports on specific real servers. The following sections explain how the
default slow-start mechanism works, along with how to set up a user-configured slow-start
mechanism and apply it to a port on a real server.
Default port slow-start mechanism
By default, when a port is activated, the Brocade Virtual ADX gives it 60 seconds of warm-up time.
Over this period, the Brocade Virtual ADX gradually increases the number of connections it allows
for the port. The default slow-start mechanism is always applied to all ports when they are first
brought online, unless they are configured to use a user-configured slow-start mechanism.
The two graphs in
illustrate how the default slow-start mechanism ramps up the
connections for a port on a real server. The graph on the left shows the rate at which the number of
connections increases over the slow-start period. The graph on the right shows how the maximum
number of connections the Brocade Virtual ADX allows for the port on the real server increases
over the slow-start period.
FIGURE 27
Default slow-start mechanism for a port
The graph on the left shows the rate at which the Brocade Virtual ADX allows connections for a
given port on a real server, as follows:
•
At the time the port is activated, the Brocade Virtual ADX allows 10 connections. Then, up to
10 seconds, the Brocade Virtual ADX allows the port up to 10 new connections every second.
•
From 10 seconds to 20 seconds, the Brocade Virtual ADX allows up to 20 new connections
every second.
•
From 20 seconds to 30 seconds, the Brocade Virtual ADX allows up to 30 new connections
every second.