HP StorageWorks XP Remote Web Console Software - Manual (Page 205)

Resuming Normal Operations at the Primary Site
Once the XP Continuous Access Journal volume pairs have been established in the reverse direction,
you are ready to resume normal operations at the primary site. The following procedure explains
how to resume normal operations at the primary site by using RAID Manager. Remember that the
XP Continuous Access Journal terminology is now reversed: the original primary data volumes are
now secondary data volumes, and the original secondary data volumes are now primary data
volumes.
1. At the primary and secondary sites, make sure that all XP Continuous Access Journal
components are fully operational and are free from failures.
2. Make sure that the pair status of primary and secondary data volumes in all XP Continuous
Access Journal pairs is PAIR. This indicates that the XP Continuous Access Journal initial copy
operations are complete and consistency is maintained.
3. Stop the applications at the secondary site.
4. Issue a request for splitting pairs to master journal groups (which were originally restore journal
groups). Use the Flush option when splitting pairs. If an error occurs when splitting pairs,
remove the error cause and go back to step 1 after resuming your business task at the
secondary site.
5. If no error occurs in step 4, wait until the suspension finishes. After the suspension finishes,
check whether there is a secondary data volume (which was originally a primary data volume)
whose pair status is other than PSUS. If such a pair exists, remove the error cause and go
back to step 1 after resuming your business task at the secondary site.
6. If there is no secondary data volume (which was originally a primary data volume) whose
pair status is other than PSUS, data in primary data volumes are the same as data in secondary
data volumes, and the secondary data volume (which was originally a primary data volume)
are usable. Resume applications at the primary site.
7. Execute the pairresync -swaps command (pairresync is the RAID Manager command for
resynchronizing pair and -swaps is a swap option). This reverses primary data volumes and
secondary data volumes to resynchronize pairs.
Caution: When you execute the pairresync -swaps command, you can use the -d option to
specify a data volume. However, if the restore journal group where the data volume belongs
is in Active, Halting or Stopping status, the pairresync -swaps command is rejected. For detailed
information about journal group status, see
“Displaying Detailed Information about a Journal
Group” (page 164) .
For detailed information about how to use RAID Manager, see the HP StorageWorks RAID Manager
User Guide.
For detailed information about the status of data volumes, see “Pair Status” (page 32) .
Recovering from Primary Site Failures in XP Continuous Access Journal
3DC Multi-Target Configuration (When Delta Resync Operation is
Performed)
If a disaster or failure occurs only in the primary site in a 3DC multi target system combining XP
Continuous Access Journal sites, you can use secondary volume in the secondary site to enable
the secondary site to take over your business tasks. When a disaster or a failure occurs, first transfer
the operations from the primary to the secondary site. To transfer your business tasks to the
secondary site, complete the following procedure. RAID Manager is used in this procedure:
1.
Use RAID Manager to execute the pairsplit -RS command on the XP Continuous Access
Journal pair in the secondary site.
2. Check the execution result of the pairsplit -RS command.
3. If the primary/secondary relationship of the XP Continuous Access Journal pair is not reversed
(meaning that the copy direction is not reversed as illustrated in the lower-right figure in
Recovering from Primary Site Failures in XP Continuous Access Journal 3DC Multi-Target Configuration (When Delta Resync
Operation is Performed)
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