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10 Disaster recovery operations

Preparing for disaster recovery

The type of disaster and the status of the Continuous Access XP Journal volume pairs determines the best

approach for disaster recovery. Unfortunately, some disasters are not “orderly” and involve intermittent or

gradual failures occurring over a longer time period. You should anticipate and plan for all types of

failures and disasters.

The major steps in preparing for disaster recovery are:

1. Identify journal groups and data volumes containing important ﬁles and data for disaster recovery.

2. For Command View XP, install the management station. For Command View XP or XP Remote Web

Console, install the Continuous Access XP Journal hardware and software, and establish Continuous

Access XP Journal operations for journal groups and data volumes identiﬁed in step 1.

3. Establish ﬁle and database recovery procedures. These procedures should already be established

for recovering data volumes that become inaccessible due to some failure.

4. Install and conﬁgure host failover software between the primary and secondary sites.

File and database recovery procedures

When the primary or secondary array suspends a Continuous Access XP Journal pair due to a disaster,

the secondary data volume might contain in-process data. A dataset could be open or transactions might

not have completed. Therefore, you must establish ﬁle recovery procedures. These procedures should be

the same

asthoseusedforrecoveringdatavolumethatbecomesinaccessibleduetoacontrolunitfailure.

Continu

ous Access XP Journal does not provide procedures for detecting and retrieving lost updates. To

detect

and recreate lost updates, you must check other current information (for example, database log

ﬁles) t

hat was active at the primary site when the disaster occurred. Since this detection/retrieval process

can take a while, your disaster recovery scenario should be designed so that detection/retrieval of lost

updates is performed after the application has started at the secondary site.

To prepare for ﬁle and database recovery, use the ﬁles for ﬁle recovery (for example, database log

ﬁles that have been veriﬁed as current).

IMPOR

TANT:

Remot

e copy and disaster recovery procedures are inherently complex. Consult your HP account support

representative on recovery procedures.

NOTE:

See Power management for arrays and network relay devices for information on recovering a pinned

track on a Continuous Access XP Journal volume.

Switching operations to the secondary site

If a disaster or failure occurs at the primary site, the ﬁrst disaster recovery activity is to switch your

operations to the secondary site. Executing the RAID Manager XP horctakeover command on Continuous

Acce

ss XP Journal pairs enables your business tasks to be taken over to the secondary site, using

seco

ndary data volumes in the secondary site. The horctakeover command checks the pair status of

Continuous Access XP Journal user guide

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