HP XP P9500 Storage - Manual (Page 106)

3. Make sure that all Cnt Ac-J 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. At the primary site, split these pairs.
2. At the primary site, locate P-VOLs whose status is other than SMPL. Locate corresponding
S-VOLs at the secondary site whose status is SMPL. At the primary site, release the pairs.
3. At the primary site, locate pairs whose status is Simplex. At the secondary site, release
the pairs.
5. On pairs that were split and in which S-VOL status is now Suspend, run the YKRESYNC
REVERSE command. This reverses P-VOLs and S-VOLs and resynchronizes the pairs. The
replication is from secondary site to original primary site.
6. For S-VOLs whose status is Simplex, recreate the Cnt Ac-J Z 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. When 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.
Resuming host operations at the primary site
When Cnt Ac-J Z pairs are established in the reverse direction between the secondary and primary
sites, you can return host operations to the original configuration. This means resuming host
operations at the primary site and reestablishing the original flow of data from primary to secondary
systems. The following procedure explains how to resume normal operations at the primary site.
1.
At both sites, make sure that Cnt Ac-J Z components are operational.
2. Make sure that pair status of P-VOLs and S-VOLs in all Cnt Ac-J Z pairs is Duplex.
3. Stop host applications at the secondary site.
4. Issue a request for splitting pairs to master journals (these were originally the restore journals
on the remote site);YKSUSPND FLUSH SVOL PERMIT command. If an error occurs when splitting
pairs, fix the error, resume host operations at the secondary site, and then go back to step 1.
5. If no errors occur, wait until suspension finishes. After suspension finishes, check for an S-VOL
on the local site whose status is not Suspend. If such a pair exists, fix the error and go back
to step 1 after resuming your business task at the secondary site.
6. When all S-VOLs at the primary site are in Suspend status, data in P-VOLs and S-VOLs are
the same. S-VOLs at the primary site are ready for host read/write activity. Resume applications
at the primary site.
7. Run the YKSUSPND REVERSE command on the restore journal (which were originally master
journal); YKSUSPND is a Business Continuity Manager command and REVERSE is an option.
Wait until suspension completes.
8. Run the YKSUSPND REVERSE command, which reverses P-VOLs and S-VOLs and resynchronizes
the pairs. The replication is from the primary site to the secondary site (disaster recovery site).
9. After suspension completes, run the Business Continuity Manager YKRESYNC REVERSE
command on the restore journal (originally the master journal). This reverses P-VOLs and
S-VOLs to resynchronize pairs and restores copy direction to its original direction.
Recovery for 3 Cnt Ac-J Z/Cnt Ac-S Z data centers and 3 Cnt Ac-J Z data
centers
All procedures described in the following sections apply to both 3 Cnt Ac-J Z/Cnt Ac-S Z data
centers and 3 Cnt Ac-J Z data center recovery.
106 Disaster recovery operations