General Preconditions
The master and proxy belong to the same class (excepting shadow classes).
The master and proxy belong to different groups or single disks.
The master is not related to any object as its proxy.
To the proxy, no other object is related as its proxy.
The type of master and proxy is mirror or single.
The proxy of the root class is performed per group.
Synchronization Snapshot Preconditions
To stripe the master and proxy, connect a stripe group to a mirror group and use them as the master and proxy. In this situation, the disk unit's copy function is unavailable.
To concatenate disks to create large master and proxy objects, connect a concatenation group to a mirror group and use them as the master and proxy. In this situation, the disk unit's copy function is unavailable.
OPC Snapshot Preconditions
Between the master and proxy, OPC or QuickOPC function is available.
To the master and proxy groups, no lower level group is connected.
To create snapshots in group unit, the volume layouts (offsets and sizes) of the master group and the proxy group are consistent.
See also "A.8 Using Advanced Copy Function in Proxy Configuration" and "3.18 Instant Snapshot by OPC."
