first of all, you only have to install the most recent CU.
First install that CU at the non-active node.
the you will have downtime ! for failing over the SQLinstance from the active node to the non-active node (which just got the CU installed )
Keep in mind SQLServer may need extra time to upgrade the database stuctures.
Then you still have to apply your chosen CU to the newly non-active node.
I suggest leaving a couple of days in between applying the CU on the second node, just in case problems pop up on the upgraded instance.
In case of failback to the non-CU-d node, SQLServer will undo the upgrades in the db.
Play it safe, start with a FULL backup of all your databases !
Johan
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