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wtwagon_99154's avatar
wtwagon_99154
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Feb 10, 2010

Health Check Issues

The Scenario:     We are performing some load testing of an application and are using a health check as follows:     GET /blah/blah.asmx HTTP/1.1\r\nUser-Agent:Mozilla\r\nhost:bl...
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wtwagon_99154's avatar
wtwagon_99154
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Feb 12, 2010
Got a nice little update..

 

 

Did some testing using the Passive + Active vs Active with success. I was able to get the F5 to successfully keep the servers in the pool during the load test using Passive + Active. When I stopped IIS on a server, it did its thing and pulled the server out, and then put it back in.. etc.

 

 

I then ran some debugging with tcpdump like you article said and discovered something alarming. The F5 would be going along good, polling every 5 seconds, and then it would just stop polling for a few minutes, and then start up again. During that time where it stopped, the servers would both be marked as down. I'm not sure what the deal is there, but I plan to open up a ticket with support to diagnose this issue. Smells like a bug to me (maybe)