You'll need to remove ownership, then reassign it. Note that removing ownership for a disk in an aggr will cause it to treat it like a disk is lost, so be careful.
cDOT:
storage disk removeowner -disk <disk.id>
storage disk assign -disk <disk.id> -owner <node>
7-mode:
disk remove_ownership <disk.id>
disk assign <disk.id>
Hope that helps.
Andrew
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