PARTIAL SNAPSHOTS IN VIRTUALIZED ENVIRONMENTS

摘要

Systems and methods create partial snapshot for a volume. Files and folders are identified for inclusion in the partial snapshot. In response to writing updated data to the volume, a volume snapshot layer can determine of the updated data is associated with a file or folder in the partial snapshot. If the file or folder is included in the partial snapshot, original data at the volume location is read from the volume and written to the partial snapshot.

主权项

1. A method for maintaining a partial snapshot of a volume, the method comprising:
receiving an indication of a volume and one or more files on the volume that are to be included in the partial snapshot of the volume; in response to receiving a request to write updated data for one or more changed block locations to the volume, determining if a changed block location of the one or more changed block locations is associated with a file included in the partial snapshot; in response to determining that the changed block location is associated with a file included in the partial snapshot, reading original data from the volume at the changed block location, and writing the original data to the partial snapshot file; and writing the updated data to the one or more changed block locations of the volume.