
Server Health Check Probes
GUI Parameter (CLI Parameter) Location Description
expects to receive in the first 1024 characters of the server
instance response. If this string is not specified, ACV probes
are disabled.
Probe SSL (probe_ssl) server pool
A flag on a server pool, disabled by default. If enabled, the
TCP and ACV probe exchange between Equalizer and the
server instance will be performed over an encrypted SSL
connection.
Once enabled, TCP and ACV probe behavior is determined by the timeouts located on the server pool
configuration screen in the GUI (and in the srvpool context in the CLI.
GUI Parameter (CLIParameter) Minimum Default Maximum Units
Max Tries Per Interval (max_tries) 0 3 30 integer
Probe Interval (probe_interval) 1 15 60 seconds
Probe Global Timeout (probe_gto) 0 5 120 seconds
Probe Connect Timeout (probe_cto) 0 1 60 seconds
Probe Data Timeout (probe_dto) 0 2 60 seconds
By default, Equalizer sends Layer 4 health check probes to a server instance at most 3 times (the Max Tries Per
Interval setting), every 15 seconds (the Probe Interval). Exactly how many probes are sent in any given probe
interval is determined by how long it takes each probe to complete and whether any of the timeouts listed above
expire while Layer 4 health checks are being sent and received. Both TCP and ACV probes are subject to the
same set of timeout values, as summarized in the following flowchart.
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Copyright © 2013 Coyote Point Systems. A subsidiary of Fortinet, Inc.
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