HP StorageWorks XP Remote Web Console Software - Manual (Page 221)

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 the business tasks (that is, you can start the business applications) by using secondary
data volumes in the secondary site. Also, if the primary storage system, the secondary storage
system, and the 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 HP XP for Business Continuity Manager Software User's
Guide.
For detailed information about the status of data volumes, see “Pair Status” (page 36) .
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
Universal Replicator for Mainframe components are fully operational.
2. At the primary site, locate the primary data volumes whose pair status is Pending duplex or
Duplex, and then locate the 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.
3. At the primary site, locate the primary data volumes whose pair status is not Simplex, and
then locate the corresponding secondary data volumes whose pair status is Simplex. If such
volume pairs are found, issue a request for releasing the pairs to the primary data volumes.
4. At the primary site, locate the data volume pairs whose pair status is Simplex, and then use
Business Continuity Manager to execute YKRECVER on the secondary data volume (YKRECVER
is a command for releasing a pair).
5. Execute the YKRESYNC REVERSE option on the secondary data volumes whose pair status is
Suspend, which is equivalent to SWAPPING in Business Continuity Manager terminology
(YKRESYNC is the Business Continuity Manager command for resynchronizing pair). This
reverses the primary data volumes and secondary data volumes to resynchronize the pairs.
6. Create pairs, specifying the secondary data volumes whose pair status is Simplex as the
primary data volumes. This creates pairs in which the primary data volumes and secondary
data volumes are reversed.
7. Verify that the pair status of all secondary data volumes (which were originally primary data
volumes) changes from Pending Duplex to Duplex. If the pair status is changed to Duplex,
initial copy operations are finished and consistency is maintained.
The above procedure enables copying of data from the secondary site to the primary site. Data
in the secondary site will be reflected on the primary site.
For detailed information about how to use Business Continuity Manager, see the HP XP for Business
Continuity Manager Software User's Guide.
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