HP XP7 Storage - Manual (Page 87)

9 Cnt Ac-J disaster recovery operations
This chapter provides instructions for performing disaster recovery.
In addition to general recovery planning and procedures, detailed instructions are included for
recovery when Continuous Access Journal pairs are configured in 3-data-center (3DC) configurations
with three Cnt Ac-J sites, and with Continuous Access Synchronous/Cnt Ac-J sites. Recovery when
Cnt Ac-J pairs are shared with Business Copy pairs is also included.
Overview
Recovery is the reason for using Continuous Access Journal and other replication software. With
copies of data at a remote location, you restore lost or damaged information from the backup
copy. With copies in multiple remote locations, you increase the level of data security, with more
complex recovery procedures.
The following is covered in this chapter;
•
“General recovery procedures” (page 87)
•
“Recovery for 3 Cnt Ac-J/Cnt Ac-S data centers” (page 89) . This includes information for both
3DC and 2DC configurations.
•
“Recovery for Cnt Ac-J/BC configurations” (page 94)
General recovery procedures
A recovery workflow consists of the following:
1.
“Preparing for recovery ” (page 87) .
2. Establish file and database recovery procedures before disaster or failure occurs, as part of
the Cnt Ac-J planning process.
See “Preparing for file and database recovery ” (page 87) .
3. After a disaster or failure, switch host operations to the remote site.
See “Switching host operations to the remote site ” (page 88) .
4. Recover the local site, then copy data to it from the remote site.
See “Reversing copy direction from remote to local sites ” (page 88) .
5. Re-establish the pair and host operations at the local site.
See “Resuming host operations at the local site ” (page 89) .
Preparing for recovery
The major steps for preparing for disaster recovery are:
•
Identify the data volumes that you want to back up for disaster recovery.
•
Pair the important volumes using Continuous Access Journal.
•
Establish file and database recovery procedures.
•
Install and configure software for host failover between the local and remote sites.
Preparing for file and database recovery
File recovery procedures are necessary when the primary or secondary system suspends a pair
due to a disaster or failure. When this occurs, the S-VOL may contain in-process data resulting
from an open data set or transactions that could not complete. File recovery procedures in these
circumstances are the same as when a data volume becomes inaccessible due to control unit
failure.
Overview 87