HP StorageWorks XP Remote Web Console Software User Manual
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7.
Execute the YKSUSPND REVERSE command on the restore journal group (which was originally
the master journal group); YKSUSPND is an Business Continuity Manager command and
REVERSE is an option. Wait until the suspension completes.
8.
After the suspension completes, execute the Business Continuity Manager YKRESYNC REVERSE
command on the restore journal group (which was originally the master journal group). This
reverses the primary data volumes and secondary data volumes to resynchronize the pairs
and restores the copy direction to its original direction.
For detailed information about how to use Business Continuity Manager, see the HP StorageWorks
XP for Business Continuity Manager Software User's Guide.
For detailed information about status of data volumes, see
.
Disaster Recovery for Multiple Primary and Secondary Storage Systems
Consistency of the Data Update Sequence When a Disaster Occurs
When a failure occurs in some primary or secondary storage system, all journal groups in the
extended consistency group will be suspended and remote copy operations will be suspended.
The consistency of the data update sequence will be maintained if a failure occurs in a primary
storage system, but the consistency will not be maintained if a failure occurs in a secondary storage
system.
For example, in the case described in the following figure, if a failure occurs in primary storage
system 1 at 10:00 a.m., journal groups 1 to 3 will be suspended due to the failure, and the data
written from the host before 10:00 a.m. will be restored to the secondary data volumes in the
secondary EXCTG, while the consistency of the data update sequence is maintained. On the other
hand, if a failure occurs in secondary storage system 1, journal groups 1 to 3 will be suspended
due to the failure, and the consistency of the data update sequence will not be maintained for the
secondary data volumes in the extended consistency group.
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