Continuous Access Xp For The Array; Overview Of Continuous Access Xp Operations - HP StorageWorks XP12000 User Manual

1 Continuous Access XP for the
Array
HP StorageWorks Continuous Access XP creates and maintains duplicate copies of user data from a local
disk array on a remote disk array. These copies are useful for data duplication, backup, and disaster
recovery. Continuous Access XP has synchronous and asynchronous copy modes to accommodate a
wide variety of user requirements and data copy or movement scenarios. Continuous Access XP is
used for open systems data.
NOTE:
This user guide applies only to Continuous Access XP Synchronous and Continuous Access XP
Asynchronous. It does not apply to Continuous Access XP Journal. For information about Continuous
Access XP Journal, see the
If a system failure or disaster occurs at the primary (main) site, Continuous Access XP simplifies and
expedites disaster recovery procedures.
Continuous Access XP operations are nondisruptive and allow the primary (main) volume of each
Continuous Access XP volume pair to remain online to all hosts for read and write I/O operations. After
operations are established, Continuous Access XP operations continue unattended to provide continuous,
real-time data backup. Continuous Access XP operations can be performed across distances of up to 500
meters with a direct connection, 10 km (6.6 miles) using single-mode longwave optical fibre cables in
a switch configuration, 30 km (18.6 miles) using single-mode fiber with long-haul lasers in a switched
connection, and up to 100 km using DWDM in a switched configuration. Long-distance solutions are
provided, based on user requirements and workload characteristics, using approved channel extenders
and communication lines.
Continuous Access XP operations can be performed with Business Copy XP operations (see
Continuous Access XP
Continuous Access XP also supports LU Size Expansion (LUSE), Custom Volume Size (CVS), and HP
Cache LUN volumes. See
for more information.

Overview of Continuous Access XP operations

Continuous Access XP provides a storage-based hardware solution for disaster recovery, which enables
fast and accurate system recovery. After Continuous Access XP operations are established, duplicate
copies of data are automatically maintained for backup and disaster recovery purposes. During normal
Continuous Access XP operations, primary volumes remain online to all hosts and continue processing
read and write I/O operations. If a disaster or system failure occurs, the secondary copy of data can be
rapidly invoked to allow recovery with a very high level of data integrity. Continuous Access XP can also
be used for data duplication and migration tasks.
Continuous Access XP Synchronous provides volume-based real-time data replication and is ideal for
high-priority data backup, duplication, and migration tasks. If a disaster or system failure occurs at
the primary site, secondary Continuous Access XP Synchronous data can be rapidly invoked to allow
recovery at the volume level with an extremely high level of data integrity and currency. Up to a distance
of approximately 7-9 km, Continuous Access XP Synchronous provides the highest theoretical throughput.
Continuous Access XP Asynchronous represents a unique and outstanding disaster recovery solution for
large amounts of data spanning multiple volumes. The Continuous Access XP Asynchronous group-based
update sequence consistency solution enables fast and accurate database recovery after a disaster,
without time-consuming data recovery procedures. Continuous Access XP Asynchronous (Continuous
HP StorageWorks Continuous Access XP Journal user guide
operations) to provide multiple internal copies of Continuous Access XP volumes.
Combining Continuous Access XP with other data management operations
.
Continuous Access XP user guide
Overview of
13