Why would I change this percentage?
Reserved capacity is typically 20 percent of the base volume for asynchronous mirroring operations. Usually this capacity is sufficient.
Why do I see more than one reserved capacity candidate?
If there is more than one volume in a pool or volume group that meets the capacity percentage amount you selected for the storage object, then you will see multiple candidates.
Why don’t I see all my volumes?
When you are selecting a primary volume for a mirrored pair, a list shows all the eligible volumes.