Forum Discussion
Aantat
Cirrus
CirrusLosing Requests because of health monitoring
Hi team. I'm facing issue with losing requests because of health monitoring with a simple http application. When we have a unavailable pool member and after few seconds or minutes it becomes available we are losing 4-5 requests. Is there any tips to resolve my issue? My goal is don't lose any requests of clients. Also I thought about duplicate client requests to other node if the first one is not accepting client request. Is there any way to realize that? Any suggestions? Thanks in advance.
Aantat I believe the issue you are experiencing is when your pool member is transitioning from green (healthy) to red (failed). These connections will always drop because the F5 still thinks the device is alive because the health monitor hasn't failed yet but is in the process of failing and I do not believe you can get around this at all other than the connections dropping because the F5 doesn't transition a client from one pool member to another until the health monitor fails completely.
- Paulius
MVP
Aantat Can you go into a bit more depth on when the connections are being lost and share the configuration of the associated virtual servers and pools? Certain types of configuration will not automatically balance your connection to the next pool member without forming that initial connection to the new pool member first which sometimes does appear to be a lost request but most of the time unless a server requires persistence this goes unnoticed to the end user.
AantatHi Paulius
I'm losing that requests when node is going down. I confgirud "Action on service down" to Reselect, but I'm still losing 2-3 requests which is critical. My goal is IF one of the nodes is going down - requests goes to another node without losing that request. I hope I made it clear. Also there is no persistence
Hooni_LHi, I think below option will help.
first option is 'time until up' in monitor.
second option is 'manual Resume' in monitor
ashrafdawoodNimbostratus
Hello Aantat
please make sure that your service is automatically going up when your server become up , this is setting on service tab on server , also there is seting to make service up when sytem become up
- Aantat
Hi ashrafdawood
I'm losing requests not when node become up, but when it goes down...
- Aantat
Hi Hooni_L.
I'm facing problem not when node becames available. I'm facing it when node is going down. I confgirud "Action on service down" to Reselect, but I'm still losing 2-3 requests which is critical. My goal is IF one of the nodes is going down - requests goes to another node without losing that request. I hope I made it clear
- Paulius
Aantat I believe the issue you are experiencing is when your pool member is transitioning from green (healthy) to red (failed). These connections will always drop because the F5 still thinks the device is alive because the health monitor hasn't failed yet but is in the process of failing and I do not believe you can get around this at all other than the connections dropping because the F5 doesn't transition a client from one pool member to another until the health monitor fails completely.