Irrespective of Continuous Copy, additional local replications can be created, managed and displayed for the volumes in a storage system of a Storage Cluster with SHC-OSD by using the QuickOPC, EC and SnapOPC+ replication functions as well as remote replications with the REC replication function.
Additional replications can be operated either on the primary or on the secondary storage system. They can then only be used and managed locally on the respective storage system.
For installation, management and information output of additional replications, the respective storage system has to be active.
Additional replications each refer to one volume on a storage system. After switching to the other storage system in the Storage Cluster (failover or failback), they might no longer be available.
The following applies at a failure of the primary storage system after an automatic or at manual failover:
The replicas in the primary storage system are not available during the time of failure. They are available again after recovery.
SHC-OSD still recognizes the volumes in the primary storage system by their respective BS2000 name. However, they are no longer available.
After a successful failback, the replicas can be managed and displayed again in the primary storage system with SHC-OSD and their BS2000 names.
For a manual failover (without a failure of the primary storage system) this means:
The replicas in the primary storage system remain unchanged or are continued.
SHC-OSD still recognizes the volumes in the primary storage system by their respective BS2000 name. The replicas in the primary storage system remain visible.
After a successful failback, the replicas can be managed and displayed again in the primary storage system with SHC-OSD and their BS2000 names.