HP XP7 Storage User Manual
Page 144
Figure 44 Concept of paired volumes
Addressing paired logical volumes: The correspondence of paired logical volumes to their physical
volumes is defined by describing the paired logical volume names and group names in the
configuration definition files of each server. It is possible to define a server for the paired logical
volumes in units of group name. Each paired logical volume must belong to a group in order to
determine the corresponding server.
Specification of volumes by commands: Volume names to be used by the RAID Manager commands
must be referenced via the paired logical volume names or the group names.
Using RAID Manager with Business Copy and Continuous Access
Synchronous
RAID Manager allows you to perform Business Copy and Continuous Access Synchronous operations
by issuing Business Copy and Continuous Access Synchronous commands from the UNIX/PC server
host to the RAID storage system. Business Copy and Continuous Access Synchronous operations
are nondisruptive and allow the primary volume of each volume pair to remain online to all hosts
for both read and write operations. Once established, Business Copy and Continuous Access
Synchronous operations continue unattended to provide continuous data backup.
There are specific requirements for using Business Copy and Continuous Access Synchronous in
high-availability (HA) configurations. UNIX/PC servers in HA configurations normally support disk
duplication functions to enhance disk reliability (for example, mirroring provided by the LVM or
device driver, RAID5 or an equivalent function provided by the LVM). UNIX/PC servers also feature
hot standby and mutual hot standby functions in case of failures on the server side. However,
mutual hot standby for disaster recovery has not yet been achieved since it requires the remote
mirroring function.
Business Copy provides the mirroring function within the storage system. For detailed information
about Business Copy operations, please see the HP XP7 Business Copy User Guide for your storage
system.
144 Data replication operations with RAID Manager