ETERNUS SF Express V14.1 User's Guide

A.4.1 How to work

Figure A.6 State transition diagram

Table A.2 Relationship between OPC operation and Express function

Session operation	Express function
Start	acopc start
Stop	acopc cancel

Start

When the OPC session is started, the logical copy completes immediately and returns a "copied" response before any actual (physical) copying occurs. The actual physical copy process starts after the logical copy has finished. This is an internal ETERNUS Disk storage system background process that is not visible to the server. After the logical copy has completed, the copy destination area becomes accessible. When the physical copy has completed, the session automatically terminates.

Stop

When the OPC session is stopped, it terminates. The copy destination volume can not be used because the physical copy is incomplete.