If you set the tiering policy of a DP-VOL, the DP-VOL used capacity and the I/O performance limitation are reserved from the tier. The reserved limit performance per page is calculated as follows:

The reserved limit performance per page = (The performance limit of the tier) ÷ (The number of pages in the tier).

A DP-VOL without a tiering policy setting uses the unreserved area in the pool.