How a Server is Selected
The main functionality of Equalizer is to load-balance-- that is that when a request is received
from a client an appropriate server for to connect the request with. The "appropriate" server is
usually selected as part of a proprietary load balancing algorithm or via round-robin. Another
factor in server selection is "persistence". If a client connection has persistence associated with it,
the server to which the persists should be selected for load balancing If the server selected by
persistence is not available, the appliance uses load balancing policy to select an alternate server.
Server Selection Process Flow
The figure below shows the server selection process. As describe above, this process depends on
whether persistence is in use. Once a server is selected, Equalizer verifies that it isn’t too busy
(based on
max_connections
) and that it has been probed up. Then Equalizer tries to connect to it.
The figure below shows the connection establishment and server failover mechanism.
Copyright © 2014 Coyote Point Systems, A Subsidiary of Fortinet, Inc.
All Rights Reserved.
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