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Forum Discussion

easyfan_179507's avatar
easyfan_179507
Icon for Nimbostratus rankNimbostratus
Apr 18, 2015

[Help] Persistence Hash and Load Balancing together, Possible?

[Help] Persistence Hash and Load Balancing together, Possible? I know the request sounds weird... But it is true. Here is the thing: We know that F5 supplied a persistence CARP hash since 10.0.0....
Kevin_Davies_40's avatar
Kevin_Davies_40
Icon for Nacreous rankNacreous
Apr 18, 2015

The first change is good, but you need to remember the load balancing decision is only made at the start of the TCP connection after the first HTTP request. If you try to change the destination thereafter in the same connection, it will be ignored. Does that explain what you are seeing?

 

dragonflymr's avatar
dragonflymr
Icon for Cirrostratus rankCirrostratus
Apr 19, 2015
@Kevis, I am a bit confused about "LB decision is only made at the..." in relation to pool selection, from this article (https://support.f5.com/kb/en-us/solutions/public/9000/800/sol9800.html) it seems that explicit pool selection is performed for every HTTP request, only issue is with VS without OneConnect when there is no match in iRule and instead of default pool set for VS last pool chosen by iRule is used - or I mixed different situations here? Piotr