i have configure a global keepalive to check a uri into a server using http and port 81 as shown:
ip address 10.0.207.71
as the default frequency time is 5 secondes, im still seeing the server down, but when i increased the freq to 10 it came up,
During analysis of keepalive get requests from the content switch to the Health Check page, it would appear that with a keepalive frequency of 5 seconds, the content switch automatically sends a TCP reset 3 seconds after initiating the HTTP keepalive. With a keepalive frequency of 10 seconds the content switch automatically sends a TCP reset 8 seconds after initiating the HTTP keepalive. Is this a configurable value (i.e. the 3 seconds or 8 seconds)? If not what exactly is the algorithm ?
Unresponsive KALs are failed 2 sec before the next KAL is scheduled.
After 1 failure the service is marked as Dying
The Retry KAL timer begins once a normal KAL has failed.
Your problem lies in the fact that when a kal is sent it takes longer than 5 or 10 seconds for your server to process the request and return the result. The kal must be processed before another one is sent out so it close the request off 2 seconds before the next kal.
Increase the timer 5/10 seconds is to slow, 15/30/60 seconds is far better. Also keep in mind that you could change the get to a head. This will lead to a quicker response from the server.
Watch out since you are using a get the page will be hashed and compared, since you are using aspx pages this could lead to failures.
Hope this helped you out,
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but is there any way to change this behaviour without changing the freq time, because its a very critical server and the customer requiremnt is to make the KAL as fast as possible. maybe to send the keepalive http get after the CSS got response from the last kal ?
or maybee the scripted kal can do it ?
one more question, sometimes i found the http get request is HTTP1.1 and sometimes its HTTP1.0 and the server is only replying on http1.1 ,is this an option in the CSS (if yes how i can change) ?
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