Use a table instead of a cron job

i never tried session/table command to delete persistence record. anyway, i think you may create a new virtual server with session/table command irule, create a pool with virtual server as a member and then assign health monitor with 15 minutes interval to the pool. so, health monitor packet will trigger the session/table command irule.

 

 

by the way, since you are load balancing cache servers, don't you want to use carp instead of source address persistence?

 

 

sol11362: Overview of the CARP hash algorithm

 

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