HP 3PAR Operating System Software - Manual (Page 158)

Restarting Synchronous Volume Groups after Link Recovery
After you recover at least one link between the systems and remote copy marks the link(s) as Up:
•
If the auto_recover policy is set, the volume groups automatically restart.
The auto_recover policy affects restart only after link failure. For more information, see
“Automatically Restarting Volume Groups” (page 119) .
•
If the no_auto_recover policy is set (the default), you must manually restart remote copy
on the systems in the remote-copy pair.
To do so, issue the startrcopygroup command on the primary system. The
startrcopygroup
command synchronizes the systems:
◦ Restarts replication for the volume groups.
◦ Reads the failed I/O from the primary virtual volumes and replicates it to the secondary
virtual volumes.
◦ Determines the difference between the base volume and the snapshot taken immediately
after replication stopped.
◦ Copies any new writes from the primary volume groups to the secondary volume groups.
Target Failure and Asynchronous Periodic Volume Groups
For asynchronous periodic volume groups, when all links between a remote-copy pair fail, the
following actions occur:
•
HP 3PAR Remote copy stops replication on both storage systems.
•
HP 3PAR Remote copy does not create any new snapshots.
•
If a resynchronization was in progress when the failure occurred, HP 3PAR Remote Copy
automatically promotes the pre-existing snapshots on the secondary volume group—but only
for those volumes that did not complete resynchronization.
For more information, see “Snapshots and Resynchronization Failure in Asynchronous Periodic
Mode” (page 273) .
Resynchronizing Asynchronous Periodic Volume Groups after Link Recovery
For asynchronous periodic groups, when the links are restored:
•
If the auto_recover policy is set, the volume groups automatically restart.
The auto_recover policy affects restart only after link failure. For more information, see
“Automatically Restarting Volume Groups” (page 119) .
•
If the no_auto_recover policy is set (the default), you must manually restart remote copy
on the systems in the remote-copy pair.
To do so, issue the startrcopygroup command on the primary system.
NOTE: For periodic asynchronous mode, running the startrcopygroup command in this
instance does not synchronize the systems.
•
To immediately resynchronize the volume groups, issue the syncrcopy command.
158 Error Handling