| 摘要 |
<p>A method and system for migrating data stored in a second computing system (e.g. a back up file system) to a first computing system (e.g. a local file system). The method includes pre-allocating a primary file matching a corresponding secondary file of the second computing system. In response to receiving a read request for a data block not yet stored in the primary file, retrieving the requested data block from the secondary file and storing the same locally in the primary file such that it is usable in the local system. The other data blocks for the file are retrieved, In the absence of read write request , until the primary file is complete in respect of data blocks stored. The invention may be used in live migrating or restoring an individual file to an existing local file system.</p> |
