HP XP P9500 Storage - Manual (Page 10)

Management software consists of:
•
Remote Web Console graphical user interface (GUI)
•
RAID Manager
Continuous Access Journal components are illustrated in the following figure and described in
greater detail in the following topics.
Figure 2 Continuous Access Journal components
P9500 storage systems
Continuous Access Journal is operated using two P9500 systems, one at the primary site and one
at the secondary site. The primary system consists of the main control unit (MCU) and the . 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
remote copy connections.
•
Each P9500 system can function simultaneously as a primary and secondary system.
Main and remote control units
The primary and secondary systems are often referred to as the MCU (primary system) and RCU
(secondary system). MCU is the main control unit, RCU is the remote control unit.
The MCU control the primary storage volume (P-VOL) and the following operations:
•
Host I/O write to the P-VOL
•
P-VOL data copy to the master journal
•
Initial copy and update copy between the P-VOL and secondary volume (S-VOL).
The RCU control the secondary storage volume (S-VOL) and the following operations:
•
Journal commands to the MCU.
•
Journal data copy from the master to the restore journal
•
Restore journal data copy to the S-VOL
•
Pair status management and configuration (for example, rejecting write I/Os to the S-VOLs).
10 Continuous Access Journal overview