HP XP P9500 Storage - Manual (Page 22)

Continuous Access Synchronous Z (Cnt Ac-S Z)
Performs and manages remote synchronized volume copy operations between a storage system
on the primary site and a storage system on the secondary site, so each S-VOL is always identical
to its P-VOL counterpart.
TrueCopy Asynchronous for Mainframe (TCA)
Stores data and control information for each P-VOL in a sidefile, and performs and manages the
remote copying of volumes independently (asynchronously) of the host I/O processes.
Continuous Access Journal Z (Cnt Ac-J Z)
Writes updated data and control information to the master journal on the primary site. When the
secondary site makes a read journal request, the updated data and control information are written
from the master journal to the restore journal (on the secondary site). This activity is performed
asynchronously to host I/O processing.
22 Overview of HP XP P9000 for Business Continuity Manager Software