I haven't seen a specific document, but it would make sense to do the
upgrades step-by-step, allowing each to complete. Since you'll have to
wait for the rebuild, I see no advantage in potentially causing major
database corruption.
The last time I upgraded a FAZ400E the database rebuild took nearly 10
days (9 days, 21 hours, 11 minutes and 0 seconds). It might have been
faster if I'd disabled the logging on the firewalls first. YMMV - It
depends on the DB size and load on the b...
