At the selections of replication functions for the local and remote replication of volumes in a storage system of a Storage Cluster (SCO volume, SCO-V), the aforementioned general conditions must be taken into account. The following table provides an overview over the replication functions that are possible or that are not allowed. Replications that are not allowed will be rejected by SHC-OSD with the NDE1610 message.
Replication function | Organization | Usability |
QuickOPC | SCO-V (active1) --> SCO-V (active) | recommended (Continuous Copy) |
SCO-V (active or standby 2) --> normal volume 3 | possible on the primary storage system (no | |
SCO-V (standby) --> SCO-V (standby) | not allowed | |
normal volume --> SCO-V (active or standby) | not allowed | |
EC | SCO-V (active or standby) --> normal volume | possible on primary storage system (however, no |
SCO-V (active or standby) --> SCO-V (active or standby) | not allowed (use Continuous Copy) | |
normal volume --> SCO-V (active or standby) | not allowed | |
SnapOPC+ | SCO-V (active or standby) --> Snap or Thin Volume | possible on the primary storage system (no |
SCO-V (active or standby) --> SCO-V (active or standby) | not allowed (use Continuous Copy) | |
Snap or Thin Volume --> SCO-V (active or standby) | not allowed | |
REC in all forms | SCO-V (active) --> normal volume | possible on primary storage system |
SCO-V (standby) --> normal volume | possible on the primary storage system (no | |
normal volume --> SCO-V (active) | possible on primary storage system 4 | |
SCO-V (active or standby) --> SCO-V (active or standby) | not allowed | |
normal volume --> SCO-V (standby) | not allowed |
1 | “active” refers to an SCO-V in an active storage system of the Storage Cluster |
2 | “standby” refers to an SCO-V in the standby mode of the storage system in the Storage Cluster |
3 | “normal volume” refers to a volume that is not used in a Storage Cluster and also not configured as snap data volume |
4 | During a remote replication with REC using an SCO-V as a target unit, the Storage Cluster is in the COPYING status. In this status, a manual failover is not possible |