To plan and implement a Continuous Access Synchronous Z installation, an understanding of its
components is required. This is provided in the following sections.
A typical configuration consists of the following elements. Many but not all require user set up.
A P9500 system—on the local side connected to a host. The system on the remote side, which
may be a P9500 system, must be connected to the local array via Fibre Channel data paths.
The remote array may consist of a different model—XP12000 Disk Array/XP10000 Disk
Array, and so on.
A host at the local site, connected to the local disk array. It is also highly desirable to have a
host at the secondary site connected to the remote system for use in disaster recovery. If this
is not possible, the local host must have channel connections to the remote disk array for the
data to be used in the event of a disaster.
A volume (M-VOL) on the local system that is copied to a volume (R-VOL) on the remote system.
Fibre Channel data paths for data transfer between the local and remote disk arrays.
Initiator and RCU target ports for the Fibre Channel interface.
Remote Web Console graphical user interface software, used to perform Continuous Access
Synchronous Z configuration and pair operations. Alternatively, Business Continuity Manager
(BCM) and PPRC commands can be used for pair operations.
The following shows a typical Continuous Access Synchronous Z environment.
Figure 1 Continuous Access Synchronous Z components
This guide documents Continuous Access Synchronous Z operations in which the main system is
a P9500 and the remote system is a P9500, XP24000/XP20000 Disk Array, or XP12000 Disk
Array/XP10000 Disk Array.
The main disk array consists of a main control unit (MCU) and service processor (SVP).
The remote disk array consists of the remote control unit (RCU) and the SVP.
The main and remote disk arrays are often referred to as the MCU and RCU.
The main disk array communicates with the remote disk array over dedicated Fibre Channel data
Continuous Access Synchronous Z overview