HP StorageWorks XP Remote Web Console Software - Manual (Page 22)

22 Continuous Access XP Journal
Initiator ports and RCU target ports
Initiator and RCU target ports are required at the primary and secondary disk arrays. The initiator port at
the primary disk array is connected to the RCU target port at the secondary disk array through the fibre
channel interface. The initiator port at the secondary disk array is connected to the RCU target port at the
primary disk array. The initiator port at the secondary disk array issues a read journal command to the
primary disk array. In response to the read journal command, the RCU target port at the primary disk array
sends journal data to the secondary disk array.
Any fibre-channel interface port of the XP10000/XP12000 can be configured as an initiator port. Initiator
ports cannot communicate with host HBAs. HBA paths must be connected to a fibre-channel interface port
other than the initiator port.
NOTE: Two or more initiator ports must be configured before you can add secondary disk arrays and
create Continuous Access XP Journal volume pairs.
Fibre-channel interface ports assigned for RCU target ports can be connected to host HBAs through a fibre
channel switch.
See ”
Configuring port attributes ” on page 79 for more information about configuring host interface ports.
Continuous Access XP Journal Graphical User Interface
The Command View XP or XP Remote Web Console Java applet program product includes Continuous
Access XP Journal for the local disk array. The Command View XP or XP Remote Web Console software
communicates with the each local disk array’s SVP through defined TCP/IP connections.
For Command View XP, the management station at the primary site must be attached to the primary disk
array. You should also attach a Command View XP management station at the secondary site to all
secondary disk arrays. You can use the Command View XP management station at the secondary site to
change the secondary disk array’s Continuous Access XP Journal parameter and access the Continuous
Access XP Journal secondary data volume (for example, for media maintenance). If you need to perform
Continuous Access XP Journal operations in the reverse direction from the remote site to the primary site
(for example, disaster recovery), the Command View XP or XP Remote Web Console software simplifies
and expedites this process.
NOTE: If the Command View XP management station is not installed, contact your HP account support
representative for information about Continuous Access XP Journal configuration services.
Host failover software
Host failover software, which transfers applications between host servers at the primary and remote sites, is
a critical component of any disaster recovery effort. Host failover is configured using the desired host
failover software product for the platform (for example, HP Serviceguard), depending on your installation
requirements and standards.
If you use Continuous Access XP Journal as a data migration tool, host failover is recommended but not
required. If you use Continuous Access XP Journal as a disaster recover tool, host failover is required to
ensure effective disaster recovery operations. When a Continuous Access XP Journal pair is suspended due
to an error condition, the primary disk array generates sense information that should be transferred to the
remote site using the host failover software for effective disaster detection and recovery.