So we went on ahead and did the upgrade from 7.1.10 to 8.0.4. I can tell you that the documentation only assumes your Panorama has a solid connection to the logger post upgrade and ours mysteriously lost it. 8.0.4 seems to be a little buggy and did not like running the migration command due to some odd connection issue to the logger that eventually cleared itself out. Love when things happen automagically 🙂 . What the documentation did not tell you is that you can run the migration command directly on the logger <request logdb migrate lc start/status/stop>. The total migration time on the single m100 took about 5 days for a typical enterprise setup. What i can tell you for the single logger is that during the migration, current logs were still viewable on the Panorama. Sadly, the separate logger cluster migration failed partly due to a bad disk that was not discovered until post upgrade and during a tshooting session of why no logs were appearing during migration. Long story short, the logging cluster setup was an epic failure but we restored visibility for those devices by separating the cluster and pointing those firewalls to the good single logger. https://www.paloaltonetworks.com/documentation/80/pan-os/newfeaturesguide/upgrade-to-pan-os-8-0/upgrade-firewalls-using-panorama.html
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