For a switch or switchback of storage systems in a Storage Cluster, the failover and failback functions are deployed.
They can be processed automatically (in case of an error) or manually, depending on the setting set with ETERNUS SF in the Storage Cluster.
The functions for the manual failover and the manual failback are integrated in SHC-OSD and are realized by the FAILOVER-STORAGE-CLUSTER and FAILOVER-STORAGE-CLUSTER commands.
The above mentioned commands affect all volumes in the Storage Cluster. The volumes can but do not have to be generated in BS2000. BS2000 resources (pubsets, volumes, mnemonics) are not checked.
A switch or switchback in the Storage Cluster is reported on the BS2000 console with the NDE0080 and NDE0081 messages. This is also recognized by the Error Recovery of the BS2000 (for /390 servers) or Linux (for x86 servers).
A manual failover or failback should not be carried out parallel to replication processes for volumes of the respective Storage Cluster. In case of concurring actions, failover and failback take priority over replication processes.