Disk recovery/reconstruction
US6662307B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 14, 1993 |
| Grant date | Dec 9, 2003 |
| Priority date | — |
| Expiry date | Jun 14, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F2201/80
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
An apparatus and method of efficiently recovering from physical disk drive (or logical file) failures in transaction based digital data processing systems. As transactions are sequentially processed, compacted audit trail records are prepared to indicate modifications resulting from each transaction. The audit trail records are stored in storage areas on a disk drive in accordance with the physical data base disk drive(s) or logical file(s) to which the corresponding transaction refers. A physical disk drive or logical file is dumped to magnetic tape whenever the associated audit trail storage area is full, thus clearing the audit trail storage area for further use. When a physical disk drive or logical file fails, the most recent dump is read. Modifications to each file of the dump are made as compacted audit trail data is processed. The modified files are destaged to a spare disk drive.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.