Reconstructing the unit from the clone unit

The data of the original unit can be reconstructed using the data of the clone unit when all current data of the original unit is to be discarded. Reconstruction makes sense, for example, when changes are to be undone. The procedures for reconstruction are integrated into the /RESTORE-FROM-CLONE command in accordance with the storage system:

• For ETERNUS DX/AF with QuickOPC (CLONE-TYPE=*COPY operand) the data is restored directly from the clone unit (Restore function).

• For ETERNUS DX/AF with EC (CLONE-TYPE=*MIRROR operand) this is carried out internally in several steps:

  • Swap the replication direction between the original and clone units (Swap function)

  • Synchronize the original and clone units (Restart function)

  • Swap the replication direction between the original and clone units again (Swap function)

• For Symmetrix/VMAX3 the data is reconstructed directly from the clone unit (Restore function).

The next two sections below describe the reconstruction procedures.