Forum Discussion
1) is difficult to answer without looking at all your irules as it depends on the irule. most things will keep working, something involving for example http class in irules wont. in principle the f5 will warn you about this upto a level before actually upgrading.
3) in principle the upgrade from 10 to 11 creates the correct HA config on itself, the device group and traffic groups are created for you.
4) is default, nothing to worry about there.
x) one of my favorites, make sure you are using the volumes scheme, not still partitions. once support.f5.com works again search for it.
as Michael mentions read the release notes. and if you have an F5 partner you might want to involve them to do the upgrade with / for you. they have probably done many of these and can help out.