we have build our clusters with one zone which switched between systems but in 
our environment this  was the wrong way because we run in patch problems. you 
need a clusterdowntime to patch all nodes+zones at the same time and keep the 
installed patches in sync.

with two no-failover zones and a application which switched between the zones, 
you can patch the systems independently with running application, the 
patchlevel can be out of sync, exactly like the old pre-zones cluster.

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