HP XP7 Storage - Manual (Page 107)

2. Bring up the host servers at the local site.
3. Make sure that all Cnt Ac-J Z components are operational.
4. Do all of the following, as applicable:
1.
At the local site, locate P-VOLs whose status is Pending duplex or Duplex. Locate
corresponding S-VOLs at the remote site whose status is Suspend, which indicates that
data is being written to the S-VOLs. At the local site, split these pairs.
2. At the local site, locate P-VOLs whose status is other than unpaired. Locate corresponding
S-VOLs at the remote site whose status is unpaired. At the local site, release the pairs.
3. At the local site, locate pairs whose status is unpaired. At the remote 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 remote site to original local site.
6. For S-VOLs whose status is unpaired, 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 remote site is now reflected on the local site.
Resuming host operations at the local site
When Cnt Ac-J Z pairs are established in the reverse direction between the remote and local sites,
you can return host operations to the original configuration. This means resuming host operations
at the local site and reestablishing the original flow of data from primary to secondary systems.
The following procedure explains how to resume normal operations at the local 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 remote 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 remote 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 remote site.
6. When all S-VOLs at the local site are in Suspend status, data in P-VOLs and S-VOLs are the
same. S-VOLs at the local site are ready for host read/write activity. Resume applications at
the local 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 local site to the remote 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
Recovery procedures when Cnt Ac-J Z P-VOLs and S-VOLs are shared with Continuous Access
Synchronous Z can be more complex than general procedures. The following topics provide
Recovery for 3 Cnt Ac-J Z/Cnt Ac-S Z data centers 107