A distinction is made between unit and clone unit.
The unit is generally in the READY status.
The following replication options are available for the unit:
The unit can be additively mirrored by RAID, SnapOPC+ or REC.
The clone unit itself can also be mirrored:
The clone unit can be mirrored by RAID, SnapOPC+ or REC.
The relevant status of the clone unit is determined by the status of the clone session.
The lifetime of a clone session extends from the time it is created (/START-CLONE-SESSION) to the time it is terminated (/STOP-CLONE-SESSION). During its lifetime, it can assume one of the following statuses:
REST-IN-PROG
For QuickOPC: the unit is reconstructed from the clone unit; the modified data is copied in the background from the clone unit to the unit. The unit must not be used.
The clone unit is in the READY status. The unit is also in the READY status (REST-IN-PROG must be regarded as being the same as COPY-IN-PROG, just in the opposite direction).
SPLIT
For QuickOPC and EC: the clone session is split after the unit and clone unit have been full synchronized. The unit and clone unit operate separately. The clone session can be continued.
For QuickOPC and EC: The /RESTORE-FROM-CLONE command was executed successfully. The clone unit is in the READY status.
SYNCHRONIZING
For QuickOPC: the clone session has been newly configured or updated, i.e. the clone unit is connected to the unit and is active. The unit is copied to the clone unit in the background. This status was achieved after configuration (start), or after a restart.
The clone unit is in the READY status.
For EC: the clone session has been configured or newly created, i.e the clone unit is connected to the unit but has not yet been activated. The unit is copied to the clone unit in the background.
The clone unit is in the NOT-READY status.
SYNCHRONIZED
EC only: the clone session has been created but not activated. After the completed copy procedure the clone pair is synchronous. This status was achieved after configuration (start), or after a restart.
The clone unit is in the NOT-READY status.
TERM-IN-PROG
The clone session is in the process of being terminated.
The clone unit is in the READY status.
FAILED
The clone session has become unusable. It can only be terminated using /STOP-CLONE-SESSION.
The clone unit is in the NOT-READY status.