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Click the subpool name.
At the bottom of the screen, the available storage is listed in the Unassigned Pdisks list on the left and the pdisks currently assigned to this subpool are listed in the Assigned Pdisks list on the right.
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Remove pdisks from the subpool by selecting storage from the Assigned Pdisks list and clicking Remove to move them to the Unassigned Pdisks list.
You cannot remove Pdisks from a subpool until they have been evacuated. If you try to remove an active pdisk from a subpool, an error appears.