1 - As long as there is NL drive space avialable the array will never deny a write if FC is filled up if FC is the user CPG. This is less than ideal situation, but the array will always write to a lower tier if the top tier is full.
2 - you can do this, but those disks need to be a in a CPG you create that is not part of an AO config. We do this all the time. We have some large low usage file servers that we do not want occupying FC space so we have a special CPG that is NL drives that is not part of an AO config, thus these vols stay in NL.
3 - As a note you need to be careful when the same class of disk is used by multiple CPGs that may participate in AP. AO has no way of knowing that a given class of disk in in different AO configs or even outside AO, thus when AO runs unless you have Growth Warnings set AO assumes it has all the disk of a given class assigned to that CPG at its disposal to use. It can get tricky and scary on systems with low available space, we have been there and it is not fun.
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