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Deciding when to forget in the Elephant file system (1999)
| Content Provider | CiteSeerX |
|---|---|
| Author | Otir, Jacob Feeley, Michael J. Hutchinson, Norman C. Veitch, Alistair C. Carton, Ross W. Santry, Douglas S. |
| Abstract | Modern file systems associate the deletion of a file with the immediate release of storage, and file writes with the irrevocable change of file contents. We argue that this behavior is a relic of the past, when disk storage was a scarce resource. Today, large cheap disks make it possible for the file system to protect valuable data from accidental delete or overwrite. This paper describes the design, implementation, and performance of the Elephant file system, which automatically retains all importantversions of user files. Users name previous file versions by combining a traditional pathname with a time when the desired version of a file or directory existed. Storage in Elephant is managed by the system using filegrain user-specified retention policies. This approach contrasts with checkpointing file systems such as Plan-9, AFS, and WAFL that periodically generate efficient checkpoints of entire file systems and thus restrict retention to be guided by a single policy for all files wit... |
| File Format | |
| Publisher Date | 1999-01-01 |
| Access Restriction | Open |
| Subject Keyword | Valuable Data Scarce Resource Previous File Version File Content Large Cheap Disk Immediate Release File Writes Traditional Pathname Modern File System Elephant File System Single Policy Entire File System Desired Version User File File System Efficient Checkpoint Irrevocable Change Filegrain User-specified Retention Policy Disk Storage Accidental Delete |
| Content Type | Text |
| Resource Type | Article |
