I've general question about ACE probe timers. I've following probe setup:
probe https probe:1061
passdetect interval 17
ACE# sh probe probe:1061detail
probe : probe:1061
type : HTTPS
state : ACTIVE
port : 1061 address : 0.0.0.0 addr type : -
interval : 34 pass intvl : 17 pass count : 3
fail count: 3 recv timeout: 10
for above probe: when ACE will declare the server as down? will it declare it down after (17*3+34) 85 seconds or it will declare it down after 115 seconds (added recv timeout=secs 3 times = 30 seconds).
we did a test and bought down the server manually. ACE declared the server down after 91 seconds (from the time when server was brought down).
The time interval between probes is the frequency that the ACE sends probes to a server marked as passed. You can change the time interval between probes by using the interval command
Before the ACE marks a server as failed, it must detect that probes have failed a consecutive number of times. By default, when three consecutive probes have failed, the ACE marks the server as failed. You can configure this number of failed probes by using the faildetect command
To configure the time interval after which the ACE sends a probe to a failed server and the number of consecutive successful probes required to mark the server as passed, use the passdetect command.
So, to summarize, taking Gavin's configuration as example. A server failure would be detected in a time between 78 seconds (2x34 +10) and 112 (3x34 +10). Once it's down, it will become operational between 34 (2x17) and 51 (3x17) seconds after it comes back up.
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