I have just done it on wednesday morning on a Active/Passive pair. 1) Make sure you disable pre-empt if it's enabled on both devices. 2) Download the image to both devices. 3) Suspend the active {A} 4) Check the other device {B} becomes active and that all services work as expected, if not fail back to {A}. 5) Upgrade {A} and reboot, wait for it to come back online. 6) Suspend the active {B} 7) Check the other device {A} becomes active and that all services work as expected, if not fail back to {B}. 😎 Upgrade {B} and reboot, wait for it to come back online. 9) Check HA Status and Versions match. Have a console cable and knowledge of how to revert to previous image if it goes wrong.
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