| 摘要 |
Instant virtual copy operations are adapted for data objects that span storage boundaries such as logical and/or physical DASD subsystems. Initially, a data storage system receives a request to copy a data object contained in the system. The storage system includes multiple storage regions separated by storage boundaries. The regions may correspond to logical or physical DASD subsystems, for example. The storage system determines whether the data object resides in more than one of these regions. If so, the storage system divides the data object into multiple subparts, each subpart contained within a single storage region. Then, the storage system separately performs an instant virtual copy operation for each subpart. On the other hand, if the data object already resides in a single one of the regions, the storage system can perform one instant virtual copy operation for the data object as a whole.
|
