Copy Data Back To The Primary Site; Resume Normal Operations At The Primary Site - HP XP P9500 User Manual

1. If such a pair exists, consistency in the S-VOL is suspect. Recovery with guaranteed
consistency is impossible. In this case, to use the S-VOL, you must release the pair.
2. If such a pair does not exist, execute the YKSUSPND REVERSE option on the restore
journal to split the pairs. Doing this insures consistency in the S-VOL(s) and thus makes
them usable.
If an error occurs, consistency in the S-VOL is dubious, and recovery with guaranteed
consistency is impossible. In this case, to use the S-VOL, you must release the pair.
If no error occurs, wait until the split operation finishes.
3. Execute the YKRESYNC REVERSE option on the restore journal (YKRESYNC is a command for
restoring a pair). This option attempts to restore the pair and reverse the primary/secondary
relationship.
4. Check whether there is a pair whose pair status of the restore journal 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.
Copying of data from the secondary site to the primary site starts.
See the manual of Business Continuity Manager for more information.

Copy data back to the primary site

When the disaster recovery procedure is completed and host applications are running at the
secondary site, the next activity is to restore the primary site and re-establish the Continuous Access
Journal Z system for copying data from the secondary site to the primary site.
The following procedure explains how to re-establish control of the Continuous Access Journal Z
pairs and copy data from the secondary site to the primary site:
1. Restore the primary system and remote copy connections.
2. Bring up the host server(s) at the primary site.
3. Make sure that all Continuous Access Journal Z components are operational.
4. Do all of the following, as applicable:
1. At the primary site, locate P-VOLs whose status is Pending duplex or Duplex. Locate
corresponding S-VOLs at the secondary site whose status is Suspend, which indicates
that data is being written to the S-VOLs. Split these pairs from the primary site.
2. At the primary site, locate P-VOLs whose status is other than SMPL. Locate corresponding
S-VOLs on the secondary site whose status is SMPL. If these pairs are identified, release
the pairs from the primary site.
3. At the primary site, locate pairs whose status is SimplexSMPL. At the secondary site,
release the pairs.
5. On pairs that were previously split and in which the S-VOL status is Suspend, execute the
YKRESYNC REVERSE command. This reverses P-VOLs and S-VOLs and resynchronizes the
pairs. Copy flow is from disaster recovery site to original primary site.
6. With S-VOLs whose status is SimplexSMPL, create pairs specifying the S-VOLs as P-VOLs. This
creates pairs in which P-VOLs and S-VOLs are reversed.
7. Verify that pair status of all new S-VOLs (which were originally P-VOLs) changes from Pending
duplex to Duplex If the pair status is changed to Duplex, initial copy operations are finished
and consistency is maintained.
Data in the secondary site is now reflected on the primary site.

Resume normal operations at the primary site

When Continuous Access Journal Z volume pairs have been established in the reverse direction,
you are ready to resume normal operations at the primary site. This means moving business
operations back to the local site and re-establishing the original flow of data from local to remote.
104 Disaster recovery operations