HP StorageWorks XP Remote Web Console Software - Manual (Page 185)

Switching Operations to the Secondary Site
If a disaster or failure occurs at the primary site, the first disaster recovery activity is to use Business
Continuity Manager to switch your operations to the remote backup site.
The basic procedures for switching operations to the remote backup site are as follows:
If you need to perform an IPL of the secondary host system, delete SIMs and then perform the IPL
before following the procedure below. When the IPL finishes, the secondary data volumes will
usually be varied online. If the secondary volume are not varied online, vary the volumes online.
If you do not need to perform an IPL of the secondary host system, ensure that the secondary data
volumes are varied online before you follow the procedure below.
1. Check whether the restore journal group includes a secondary data volume whose pair status
is Pending duplex or Suspend (equivalent to SUSPOP in Business Continuity Manager).
If such a pair exists, consistency in the secondary data volume is dubious, and recovery with
guaranteed consistency is impossible. In this case, if you want to use the secondary data
volume, you must release the pair.
2. If such a pair does not exist, use Business Continuity Manager to execute the YKSUSPND
REVERSE option on the restore journal group (YKSUSPND is a command for splitting a pair).
If an error occurs, consistency in the secondary data volume is dubious, and recovery with
guaranteed consistency is impossible. In this case, if you want to use the secondary data
volume, you must release the pair.
3. If no error occurs in step 2 , wait until the splitting finishes. When the splitting finishes, the
secondary data volume becomes usable with maintained consistency.
4. When the splitting finishes, use Business Continuity Manager to execute the YKRESYNC
REVERSE option on the restore journal group (YKRESYNC is a command for restoring a pair).
This option attempts to restore the pair and reverse the primary/secondary relationship.
5. Check whether there is a pair whose pair status of the restore journal group is Suspend
(equivalent to SWAPPING in Business Continuity Manager).
If such a pair does not exist, the pair is successfully restored and the copy direction is reversed,
and then copying of data from the secondary site to the primary site will start.
6. If the YKSUSPND command finishes successfully and the splitting ends successfully, you can
resume business tasks (that is, you can start business applications) by using secondary data
volumes in the secondary site. Also, if the primary storage system, the secondary storage
system, and remote copy connections are free from failure and fully operational, the restoring
of the pair will finish successfully, and then copying of data from the secondary site to the
primary site will start.
For detailed information about how to use Business Continuity Manager and about pair status in
Business Continuity Manager, see the Business Continuity Manager user's guide.
For detailed information about status of data volumes, see Pair Status .
Transferring Operations Back to the Primary Site
Once the disaster recovery procedure is finished and your business applications are running at
the secondary site, the next activity is to restore the primary site and make arrangements for copying
data from the secondary site back to the primary site. The following procedure explains how to
use Business Continuity Manager to copy data from the secondary site to the primary site:
1. Restore the primary storage system and remote copy connections, and make sure that all URz
components are fully operational.
2. At the primary site, locate primary data volumes whose pair status is Pending duplex or Duplex,
and then locate corresponding secondary data volumes whose pair status is Suspend, which
is equivalent to SWAPPING in Business Continuity Manager terminology. If such volume pairs
are found, issue a request for splitting the pairs to the primary data volumes.
Switching Operations to the Secondary Site 185