something i've never tried actually, but i would follow this
dan-572483 (4/25/2013)
1) Install SP on the passive node2) Failover
3) Install SP on the other node.
4) Failover
5) Install CU on the 1st (now passive) node
6) Failover
7) Install CU on the (now passive) node.
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"Ya can't make an omelette without breaking just a few eggs" 😉