发明名称 |
RECOVERY OF FILE SYSTEM DATA IN FILE SERVERS MIRRORED FILE SYSTEM VOLUMES |
摘要 |
The invention provides a method and system for recovery of file system data in file servers having mirrored file system volumes. The invention makes use of a "snapshot" feature of a robust file system (the "WAFL File System) to rapidly determine which of two or more mirrored volumes is most up-to-date, and which file blocks of the most recent mirrored volume have been changed from each one of the mirrored file systems. In a preferred embodiment, among a plurality of mirrored volumes, the invention rapidly determines which is the most up-to-date by examining a consistency point number maintained by the WAFL File System at each mirrored volume. The invention rapidly pairwise determines what blocks are shared between that most up-to-date mirrored volume and each other mirrored volume, in response to a snapshot of the file system maintained at each mirrored volume and are stored in common pairwise between each mirrored volume and the most up-to-date mirrored volume. The invention re synchronizes only those blocks that have been changed between the common snapshot and the most up-to-date snapshot.
|
申请公布号 |
WO0229572(B1) |
申请公布日期 |
2003.04.24 |
申请号 |
WO2001US31422 |
申请日期 |
2001.10.04 |
申请人 |
NETWORK APPLIANCE, INC. |
发明人 |
VISWANATHAN, SRINIVASAN;KLEIMAN, STEVEN, R. |
分类号 |
G06F11/14;G06F11/20;(IPC1-7):G06F11/20 |
主分类号 |
G06F11/14 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|