Operating System Software Owner manual

◦ <pattern> - Pattern of volume group names (for example, Group*)
While this command completes, Remote Copy makes changes as a result of host writes only
on the primary volume (because the syncrcopy command sends the last resynchronization
points over the network to the backup storage system).
• (Synchronous mode only) To manually force a full synchronization between volume groups in
synchronous mode:
# syncrcopy -ovrd <group_name>
or:
# syncrcopy -ovrd -pat <pattern>
◦ <pattern> - Pattern of volume group names (for example, Group*)
• (Asynchronous periodic mode) To schedule a resynchronization of an asynchronous periodic
volume group for a specific time (for example, 12:00pm each day), you must use a host-based
script that incorporates manual resynchronization commands.
For more information on the synchronization period, see “Setting Up Resynchronization for
Asynchronous Periodic Mode” (page 201).
Changing Secondary Volume Groups to Primary
If a primary system or primary volume group fails, you can change secondary volume groups to
primary volume groups to aid in disaster recovery. This change:
• Reverses the direction of data replication
• Enables I/O to the volume groups
• Allows you to export the volume groups as read/write as part of the disaster-recovery process
(if you do not change secondary volume groups to primary groups, volumes are exported as
read-only)
Changing One Volume Group
To change a single secondary volume group to a primary group, enter:
# setrcopygroup failover <group_name>
• <group_name> - Name of the secondary volume group (for example, Group1.r96) to change
to a primary group
Changing All Volume Groups on a System
To change all secondary volume groups on the backup system to primary groups, enter:
setrcopygroup failover -t <target_name>
• <target_name> - Name of the primary (failed) system (for example, System1)
Additional Information:
• “About the Remote Copy Commands” (page 222)
• “Recovering from Disaster” (page 102)
Changing Secondary Volume Groups to Primary 93