HP StorageWorks XP24000 Continuous Access Journal Software User and Reference Guide, v01 (T5278-96001, June 2007)

1OverviewofHPStorageWorks

Co ntinuous Access Journal

Software

ContinuousAccessJournal

The Continuous Access Journal feature enables you to create and maintain duplicate copies of all

user data stored on a distant HP storage system for data duplication, backup, and disaster recovery

purposes. This will enable you to recover your valuable data and protect it from a disaster, for

example, an earthquake, ﬁre, or system failure. Continuous Access Journal for UNIX or a PC ser ver

provides asynchronous copy modes to a ccommodate a wide variety of user requirements and data

copy/movement scenarios. Continuous Access Journal provides a superior hardware-based solution for

data duplication, data migration, remote copy, and disaster recovery tasks.

Continuous Access Journal operations are nondisruptive and allow the primary data volume of each

Continuous Access Journal volume pair to remain online to all hosts for both read and write I/O

operations. Once established, Continuous Access Journal continues unat tended to provide continuous,

real-time data backup. By establishing the primary data volumes and secondary data volumes on the

different storage systems, you can p erform the asynchronous operations remotely. For a Fibre Channel

connection, Continuous Access Journal op erations ca n be performed a cross distances of up to 30 km

(18.6 miles) using single -m ode longwave optical ﬁbre cables in a switch conﬁguration.

When Continuous Access Journal is used, data to be copied will be temporarily stored in journal volumes,

whichare atypeofvolume(LU). Continuous Access Journalenables youto conﬁgure and manage

highly reliable data replication systems by using journal volumes to reduce chances of suspension of

copy operations. Copy operations can be suspended due to restrictions on data transfers from the

primary site to the secondary site.

Continuous Access Jou rnal operations can be performed in conjunction with HP StorageWorks XP Business

Copy operations (see “Business Copy a nd ShadowImage for Mainframe” on page 16) to provide

multiple internalcopiesofContinuousAccessJournal volumes. Continuous Access Journalalsosupports

the

HP StorageWorks X P Virtual LVI/LUN and HP StorageWorks XP Cache Residency Manager features

of the storage system, so that Continuous Access Journal meets a variety of user ne eds and facilitates

data copying and data migration. See “Interoperability with Other Products and Functions”onpage50

for further information on combining Continuous Access Journal with these and other data manag em ent

features.

TheHPStorageWorksXPRemoteWeb Consolesoftwaredisplaysdetailed Continuous Access Journal

information a nd allows you to conﬁgure and perform Continuous Access Journal operations. The Remote

Web Console soft ware communicates with the SVP of the storage system via deﬁned TCP/IP connections.

In the

event of a system failure or disaster at the primary site, the Remote Web Console software also

simpliﬁes and expedites disaster recovery procedures.

This document describes and provides instructions for performing Continuous Access Journal operations

using the licensed Remote Web Console software. Continuous Access Journal operations can also be

performed from the UNIX or PC-server host using the HP StorageWorks XP RAID Manager software

product. For information and instructions on using RAID M anager to perform Continuous Access Journal

operations, see the HP StorageWorks XP RAID Manager User’s Guide. Thisuser'sguide does notcover

Universal Replicator for Mainframe o perations for ma inframe data. For information and instruction on

performing Universal Replicator for Mainframe operations, see the Hitachi Universal Replicator for z/OS

User and Referenc e G uide or contact your HP service representative.

XP24000 Continuous Access Journal Software User a nd Reference Guide