HP StorageWorks XP Remote Web Console Software - Manual (Page 17)

Channel interface (single-mode long wave) connections are used, two switches are required for
distances greater than 10 km (6.2 miles), and distances up to 30 km (18.6 miles) are supported.
See Setting up Remote Copy Connections for further information on installing and configuring the
FC remote copy connections.
The URz remote copy configuration between primary storage system and secondary storage system
has the following requirements:
URz supports 1-to-1 remote copy connection in one journal group pair. In one journal group pair,
one primary storage system can be connected to only one secondary storage system. This
configuration ensures the backup data consistency of two or more volumes (for example, large
databases) within the same storage system.
HP strongly recommends that you establish at least two independent remote copy connections from
the primary storage system to the secondary storage system and vice versa to provide hardware
redundancy for this critical communications path.
Initiator Ports and RCU Target Ports
The initiator port and the RCU target port are required at both the primary storage system and
secondary storage system. The initiator port at the primary storage system is connected to the RCU
target port at the secondary storage system via the fibre channel interface. The initiator port at the
secondary storage system is connected to the RCU target port at the primary storage system. The
initiator port at the secondary storage system issues a "read journal" command to the primary
storage system, and then the RCU target port at the primary storage system sends journal data to
the secondary storage system in response to the "read journal" command.
Any Fibre Channel interface port of the XP disk array can be configured as an initiator port. The
initiator ports cannot communicate with the host processor channels. The host channel paths must
be connected to the Fibre Channel interface port other than the initiator port.
NOTE: Two or more initiator ports must be configured before you can add the secondary storage
systems and create the URz volume pairs.
The Fibre Channel interface ports that are assigned for the RCU target ports can be connected to
the host channel paths via the Fibre Channel switch.
See “Configuring Port Attributes” (page 99) for the information on configuring host interface port.
URz Remote Console Software
XP disk array Remote Web Console Java applet program product includes URz for the XP disk
array. The XP disk array Remote Web Console software communicates with the SVP of each XP
disk array via defined TCP/IP connections. .
The XP Remote Web Console PC at the primary site must be attached to the primary subsystem.
You should also attach an XP Remote Web Console PC at the secondary site to all secondary
subsystems. Having an XP Remote Web Console PC at the secondary site enables you to change
the URz parameter of the secondary subsystem and access the URz secondary data volume (for
example, for the maintenance of media). If you need to perform URz operations in the reverse
direction from the secondary site to the primary site (for example, disaster recovery), the XP disk
array URz software simplifies and expedites this process.
NOTE: If the XP Disk Array Remote Web Console remote console PC is not installed, contact
your HP representative for information on URz configuration services.
Host I/O Time-Stamping Function
If you plan to establish URz journal groups, the I/O time-stamping function must be installed on
the host processor at the primary site. The I/O time-stamp, which is provided by MVS DFSMSdfp,
is the same time-stamp that is used by Compatible XRC pairs. The I/O time-stamping function
URz Components 17