HP StorageWorks XP24000 Continuous Access Journal Software User and Reference Guide, v01 (T5278-96001, June 2007)

4. Issue a request for split ting 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 a fter 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 seconda ry 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 secondar y data
volumes, and the secondary data volume (which was originally a primary data volume) are
usable. Please resume applications at the primary site.
7. Execute the pairresync -swaps command (pairresync is the R AID 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. H owever, if the restore journal group where the
data
volume belongs is in Active, Halting or Stopping status, the pairresync -swaps
command will be rejected. For detailed information about journal group status, see
“Displaying D etailed Information about a Journal Group” on page 115.
For detailed information about how to use RAID Manager, see HP StorageWorks XP R A ID Manager
User’s Guide.
For detailed information about the status of data volumes, see “Pair Status” on page 32.
Recover
ing from a Disaster in a 3DC Cascading Configuration
If a disa
ster or failure occurs in the primary site in a 3DC cascading configuration, you can use
Continuous Access Synchronous secondary data volumes in the intermediate site to enable the
intermediate site to take over your business tasks. If a disaster or failure occurs in the primary site, first
you must
transfer your business tasks from the primary site to the intermediate site.
To transfer your business tasks to the secondary site:
1. Check the consistency of the Continuous Access Synchronous S-VOL in the intermediate site.
2. Use RAI
D
Manager to execute the horctakeover command on the Continuous Access
Synchronous pair that exists between the primary site and the intermediate site.
3. Wait until the Continuous Access Synchronous S-VOL in the intermediate site bec om es suspended
(in SS
WS status) or changes to a Continuous Access Synchronous P-VOL.
After
the
S-VOL becomes suspended or changes to a P-VOL, you can use the volume to resume
your business tasks.
For d etailed information about how to use RAID Manager, see HP StorageWorks XP24000 RA I D
Manager Reference.
When a disaster or failure occurs, the above procedure enables you to resume your business tasks
by
usi
ng the
Continuous Access Synchronous volume at the intermediate site. The Continuous Access
Synchronous volume at the intermediate site will contain the same data that is stored in the Continuous
Access Synchronous P-VOL at the primary site.
For d
etailed information about the pair status of data volumes, see “ Pair Status”onpage32.
Recovering from a Disaster at the Primary Site in a 3DC
Multi-Target Configuration
If a disaster or failure occurs only in the primary site in 3DC multi-target system, you can use secondary
volume at the Continuous Access Synchronous secondary site to enable the secondary site to take over
your business tasks. After transferring your business tasks to the secondar y site, you need to remove
the
failure from the primary site, so that you will be able to transfer your business tasks back to the
primary site.
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