Transferring Operations Back To The Primary Site - Hitachi G200 User Manual

S-VOL status
For pairs with a P-VOL fence level setting of Never, further analysis is required to determine the S-VOL
consistency. This can be determined by using sense information transferred via host failover, or by
comparing the contents of the S-VOL with other files that are confirmed to be consistent (for example,
database log files). The S-VOLs should be recovered using the files that are confirmed to be consistent.
Actual data recovery must be done using recovery point data in the database operation log.

Transferring operations back to the primary site

When host operations are running at the secondary site, the primary site
should be restored and operations transferred back.
In the following procedure, you will establish TC pairs at the secondary site,
with data flow moving from the secondary site to the primary. After the pairs
are synchronized and in PAIR status, they will be released, and then new
pairs will be created at the primary site with data flow moving from primary
to secondary, as originally set up.
Select the appropriate procedure below based on whether you deleted pairs
to switch operations to the secondary site, or ran the CCI Run horctakeover
or pairsplit-RS to the S-VOL command.
To transfer operations to the primary site—if pairs were deleted when
operations were switched to the secondary site
1 At the primary site, bring up the host. Make sure that TC components are
.
operational.
2 At the primary system, release all pairs on the primary system.
.
The Delete Pair by Force option must be used because the paired S-VOLs
are in the SMPL state at the secondary site.
3 At the primary system, delete the TC association with the secondary
.
systems (Remove Remote Connections). In Device Manager - Storage
Navigator, connect to each primary system to make sure that all RCUs
are deleted.
4 At the primary and secondary systems, change path and port settings.
.
- To use the same switches, change the operating mode to the opposite
direction.
- To use the same extenders, change the operating mode to the opposite
direction. The boxes/nodes connected to the primary system must be set
to channel-mode, and the boxes/nodes connected to the secondary
systems must be set to device-mode.
5 At the secondary system, set up the TC system with the remote site as
.
the primary system, and the local site as the secondary system.
6 At the secondary system create the pairs, with the S-VOLs at the primary
.
site. Make sure to use Entire Volume for the Initial Copy Type option.
Confirm that the pairs are created and that status is PAIR.
Hitachi TrueCopy® User Guide for Hitachi Virtual Storage Platform Gx00 and Fx00 Models
Type Fence level
Disaster recovery
Consistency of S-VOL
dialog box (MCU SVP time) will help to determine the last
time the S-VOL was updated.
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