Server disk error recovery system
US5649093A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 22, 1995 |
| Grant date | Jul 15, 1997 |
| Priority date | — |
| Expiry date | May 22, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N7/17336
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The present invention provides a mass storage system suitable for incorporation in a video-on-demand server that is capable of detecting and correct errors without a substantial increase in processor capacity or memory buffer size, and without any increase in disk input/output (I/O) bandwidth. The mass storage system includes a server controller, a cluster of data disk drives and a parity drive associated with the cluster of data disk drives. The controller provides video data streams to a number of viewers. Data is stored as contiguous data strips in the cluster of data drives. Each data strip includes a plurality of contiguous data slices logically distributed across the cluster of data drives. A plurality of parity slices, each parity slice corresponding to each data strip, is stored in the parity drive. When the failure of one of the data drives is detected, the parity drive is read in place of the failed drive. Hence, all functional data drives are read along with the parity drive before the erroneous slice is needed. A replacement data slice is reconstructed from the parity slice and "good" data slices. Alternatively, the data drives of the mass storage system are partitioned…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.