I am currently running two Cisco ASA 5520's in an active/passive failover pair. We are currently running version 8.0.2 of the firmware and would like to upgrade to the newest version.
I have two questions: 1) Should I upgrade all the way to 8.4.1 or go with a pre-8.3 version of 8.2.4? And why?
2) Should I upgrade all-in-one (i.e. from 8.0.2 to 8.4.1) or one minor revision at a time (i.e. 8.0.2 to 8.0.5 to 8.2.4 etc.)?
Uptime is of great importance. We can't have more than a few minutes of downtime and ensuring that things work smoothly when the firewalls are on the new firmware is very important.
If there is any other information you feel is important when trying to make this decision, please feel free to ask me.