I've reviewed the zero downtime upgrade documentation and it says that it is supported in several scenarios. The one most closely related to my upgrade is this scenario:
You can upgrade from a minor release to the next minor release. You cannot skip a minor release.
For example, you can upgrade from 7.0 to 7.1. Upgrading from 7.0 directly to 7.2 is not supported for zero-downtime upgrades; you must first upgrade to 7.1.
Now my question - I am upgrading from 8.0(2) to 8.2.1(11). There is no version 8.1 for my ASA model 5510. Will I still be able to do a zero downtime upgrade? If so, will I be able to upgrade directly from 8.0(2) to 8.2.1(11) or do I need to upgrade something like this:
8.0(2) -> 8.0(5)
8.0(5) -> 8.2.1ED
8.2.1ED -> 8.2.1(11)
That is a lot of software upgrades and, if possible, I would like to do this directly and reduce risk.