HP XP P9500 Storage - Manual (Page 8)

recovery. If this is not possible, the local host must be in communication with the secondary
system.
•
A primary volume (P-VOL) on the local storage system that is copied to the secondary volume
(S-VOL) on the secondary system. The primary and secondary volumes may be composed of
expanded LUs using LUN Expansion.
•
Fibre Channel data paths for data transfer between primary and secondary systems.
•
Target, initiator, and RCU target ports for the Fibre Channel interface.
•
Remote Web Console graphical user interface software, used to perform Continuous Access
Synchronous configuration and pair operations. RAID Manager software may also be used
for most pair operations and disaster recovery operations.
The following figure shows a typical Continuous Access Synchronous environment.
Storage systems
This guide documents Continuous Access Synchronous operations in which the primary system is
an XP P9500 and the secondary system is an XP P9500, XP24000/XP20000 Disk Array or an
XP12000 Disk Array/XP10000 Disk Array.
•
The primary system consists of a main control unit (MCU) and service processor (SVP).
•
The secondary system consists of the remote control unit (RCU) and the SVP.
The primary system communicates with the secondary system over dedicated Fibre Channel data
paths.
Primary (MCU) and secondary (RCU) systems
The primary system manages the P-VOL and the following operations:
•
Host I/O operations to the P-VOL.
•
Initial copy and update copy operations between the P-VOL and S-VOL.
•
Pair status and configuration information.
The secondary system manages the S-VOL and the following operations:
•
Remote copy operations issued by the primary system.
•
Assists in managing pair status and configuration (for example, rejects write I/Os to the S-VOL).
The HP XP P9500 CU can function simultaneously as a primary system for one or more P-VOLs,
and as a secondary system for one or more S-VOLs. This kind of configuration requires that data
paths and Fibre Channel ports are configured for both copy directions.
8 Continuous Access Synchronous overview