Forum Discussion

f5mkuDefault's avatar
Jun 02, 2021

How does health monitor works

hi experts,

 

Just want to confirm,

 

supposed the health monitor has interval of 5 secs and time out at 16sec - DEFAULT settings.

 

Does this mean that even if the pool member is down for let say 1 seconds, F5 won't mark it down?

 

F5 will only mark it down after 16 seconds.

 

Is this correct?

 

TIA

4 Replies

  • Hi Tia,

     

    the F5 will check every 5 seconds. After 16 seconds, if it has three consecutive failed checks (5 sec+5sec+5sec+1sec), it will mark the pool member down. It's basically three checks plus 1 second.

    This way the F5 can send three health checks and it provides a reasonable amount of time to for the pool member to reply.

     

    KR

    Daniel

    • f5mkuDefault's avatar
      f5mkuDefault
      Icon for Cirrus rankCirrus

      Hi Daniel, this means that if the server went unreachable for 3 seconds, f5 will not mark it RED. Correct?

      • Daniel_Wolf's avatar
        Daniel_Wolf
        Icon for MVP rankMVP

        Correct. It will mark it red after 16 seconds of being unreachable.