I believe the tier hierarcy is Array -> Stg pool -> vol. So if you set at tier at array level then Stg and vols will inherit this setting. But you are able to override the tier setting at either sub level if you have a need.
I believe the tier hierarcy is Array -> Stg pool -> vol. So if you set at tier at array level then Stg and vols will inherit this setting. But you are able to override the tier setting at either sub level if you have a need.