Swap HA nodes after each upgrade or do all at once?

My plan is to do a yum upgrade, distro upgrades and a major Asterisk version switch on my High Availability machines.

To avoid much downtime I am thinking of doing it all at once.

So perform distro, yum and asterisk major version upgrade on first node FreePBX-A while Node B is in standby, then bring B online, swap and do upgrades on B.

Or should I rather separate the different upgrades and swap nodes after each?

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