Forum Discussion

Ron79_145050

Nimbostratus

Feb 21, 2014

HASH Carp Persistence

Hi guys,

I've just configured HASH persistence using CARP Algorithm, as describe in this document:

http://support.f5.com/kb/en-us/solutions/public/11000/300/sol11362.html

I've defined a persistence profile with this options:

Hash Algorithm: CARP

iRule: Select the iRule you created which contains the persist hash command.

Timeout: 0 seconds

This is the iRule:

when CLIENT_ACCEPTED { persist carp [IP::client_addr] }

This Persistence Profile has been applied in a Virtual Server type "Performance Layer (L4)" port UDP.

I've noticed something strange, active connections has increased around 35-40%, is this normal?, using this algorithm active connections have to be higher?

Thanks for your help, Ron

Anesh
Cirrostratus
May 04, 2014
So if it bypasses load balancing method, there would be chances of uneven load balancing, correct?
nitass
Employee
May 04, 2014
there would be chances of uneven load balancing, correct?

yes
Anesh
Cirrostratus
May 04, 2014
Is there any other persistence method i can use for a long lived application using ssl (SSL offloading is not an option.) also taking into account even distribution of load to all pool members in a pool.
nitass
Employee
May 04, 2014
Is there any other persistence method i can use for a long lived application using ssl (SSL offloading is not an option.) also taking into account even distribution of load to all pool members in a pool.

without ssl offloading, persistence method is limited. i do not think you have much choice.
Anesh
Cirrostratus
May 04, 2014
Thanks for your help
Anesh
Cirrostratus
May 05, 2014
Just Found this http://support.f5.com/kb/en-us/solutions/public/12000/000/sol12078.html FastL4 virtual servers stop processing traffic after a hash persistence profile is applied.

Does the above also apply when using CARP?