Snapshots of file systems in data storage systems

摘要: The present invention relates to methods and systems of snapshot management a file system in data storage system. To represent the snapshots, maintains pointers root block pointer each snapshot. When active is modified, this avoids overwriting any blocks used by previous snapshots allocating new for modified blocks. needs put an established location, it must update parent point location. may then require so forth. Parts not since remain place. amount space required scales with fraction that users modify. maintain integrity, keeps track first last use map spread throughout space. delete background process find no longer makes them available future use.