HP XP7 Storage - Manual (Page 146)

mirror volumes of the P-VOL are expressed as virtual volumes using the mirror descriptors (MU#0-2)
in the configuration diagram as shown below.
Figure 46 Business Copy duplicated mirrors
Business Copy cascading pairs
Business Copy provides a cascading function for the Business Copy S-VOL. Cascading mirror
volumes can be specified up to the maximum quantity 2. The cascading mirrors of the S-VOL are
expressed as virtual volumes using the mirror descriptors (MU#1-2) in the configuration diagram
as shown below. The MU#0 of a mirror descriptor is used for connection of the S-VOL.
146 Data replication operations with RAID Manager