HP StorageWorks XP Remote Web Console Software - Manual (Page 19)

feet, 0.93 miles) are supported. If the distance between the primary and secondary sites is greater
than 1.5 km, optical single mode long wave interface connections are required. When Fibre
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” (page 62) for further information on installing and
configuring the Fibre Channel remote copy connections.
The Universal Replicator for Mainframe remote copy configuration between the primary storage
system and secondary storage system has the following requirements:
•
Universal Replicator for Mainframe supports a 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.
NOTE: 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 on the XP storage system 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 a 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 Universal Replicator for Mainframe 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 144) for information on configuring the host interface port.
Data Volume Pair
Universal Replicator for Mainframe performs remote copy operations for data volume pairs created
by the user. Each Universal Replicator for Mainframe pair consists of one primary data volume
and one secondary data volume, which can be located in different storage systems. The Universal
Replicator for Mainframe primary data volumes are the primary volumes (LDEVs) which contain
the original data, and the Universal Replicator for Mainframe secondary data volumes are the
secondary volumes (LDEVs) which contain the backup or duplicate data. During normal Universal
Replicator for Mainframe operations, the primary data volume remains available to all hosts at all
times for read and write I/O operations. During normal Universal Replicator for Mainframe
operations, the secondary storage system rejects all host-requested write I/Os for the secondary
data volume. The secondary data volume write enable option allows write access to a secondary
data volume while the pair is split and uses the secondary data volume and primary data volume
track maps to resynchronize the pair (see
“Secondary Data Volume Write Option” (page 30) ).
Universal Replicator for Mainframe also supports the Virtual LVI/LUN (VLL) and Cache Residency
Manager features, so that Universal Replicator for Mainframe meets a variety of user needs and
facilitates data copying and data migration. This ensures that all user data can be backed up or
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