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HTTPS sessions not being distributed evenly

weighted least requests

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#1 Phil Yeomans

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Posted 14 March 2019 - 07:59 AM

We have a 340 ADC.  We've set up a HTTPS service with 6 real servers.  The load balancing algorithm is Weighted Least Requests and Session Persistence is Source IP with a netmask of 255.255.255.255.  Each real server has an identical weight of 1. 

 

Real server 1 always gets a lot more connections than the other real servers (50-60 connections when the other servers have 0-3 connections).  We've examined our connection logs and we're not seeing lots of connections from a single source IP - lots of different source IPs are being sent to real server 1. 

 

In normal operation this doesn't cause a problem but in periods of high traffic server 1 gets swamped while the other servers are doing relatively little.  Does anyone have any suggestions what we might be able to do to rectify this?



#2 Phil Yeomans

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Posted 14 March 2019 - 08:07 AM

Correction - it’s a 540 ADC, not a 340.

#3 Risov Chakrabortty

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Posted 22 June 2019 - 09:01 AM

Phil, 

Instead of Least connection try to use Round Robin, and see the behaviour, beside that is there any proxy involved in between end user and Load Balancer?, if so source IP based persistence will not be appropriate way to maintain it, and can use cookie based persistency.