Reconstructing the unit for ETERNUS DX/AF

Requirements

• All clone pairs are in the SPLIT status.

• Processing has been terminated on the units and clone units.

• The original pubsets and clone pubset have been exported if all original units of a pubset are to be reconstructed.

• The units and clone units are in the READY status.

Initiating reconstruction

Copy the data to the original units:

/RESTORE-FROM-CLONE
   UNIT=*BY-PUBSET(PUBSET=<cat-id>) / *BY-VOLUME(<vsn>) / <unit MN> / 
        *BY-STORAGE(SERIAL-NUMBER=<serialnumber>, 
                      LOGICAL-VOLUME=<logical volume number>)

When multiple clone sessions exist for the same original unit and are in the SPLIT status, the command automatically selects the first possible pair.

Further sequence of operations

During the reconstruction process, the clone pairs change their status and, for EC only (CLONE-TYPE=*MIRROR), temporarily change the replication direction. Console message NDE0060 indicates that reconstruction is complete and that the status is once again SPLIT. The clone units are accessible. The clone pairs can continue to be used directly.

When the clone units of the split pubsets are renamed during activation, integrated renamining can also take place as part of RESTORE processing. Here the original name of the original pubser or any other name can be used. The general conditions described in section "Activating clone pairs" also apply here.

Asynchronous command execution

For QuickOPC (CLONE-TYPE=*COPY) an asynchronous command execution is possible (WAIT=*NO operand).

For EC (CLONE-TYPE=*MIRROR) no asynchronous command execution is possible because of the integrated process. The WAIT=*NO operand cannot be specified.

Synchronous command processing

When the WAIT=*UNTIL-RESTORED operand is specified in /RESTORE-FROM-CLONE, the command waits for the reconstruction process to terminate, i.e. until the CLONE pair is in the SPLIT status and is once again synchronous. This is the only possible command process for EC (CLONE-TYPE=*MIRROR).

Resuming the original clone replication

In another optional step the original clone replication can be resumed again or the clone unit can be updated. This enables the original clone pairs containing the data of the clone units to be used again.

/RESTART-CLONE-SESSION
  UNIT=*BY-PUBSET(PUBSET=<orig-cat-id>) / *BY-VOLUME(<vsn>) / <unit MN> /
  *BY-STORAGE(SERIAL-NUMBER=<serialnumber>, 
  LOGICAL-VOLUME=<logical volume number>)

If further clone sessions which are not in the SPLIT status exist for the same original unit, the command is rejected.

During the reconstruction process the clone pairs are in the SYNCHRONIZING status. Console message NDE0060 indicates that reconstruction is complete and that the status is SYNCHRONIZED. For QuickOPC (CLONE-TYPE=*COPY) the clone units are accessible immediately. For EC (CLONE-TYPE=*MIRROR) the clone units are not accessible during the recovery process.