Fault tolerant disk array data storage subsystem
US5459857A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 27, 1994 |
| Grant date | Oct 17, 1995 |
| Priority date | — |
| Expiry date | Sep 27, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F11/2094
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A pair of operationally independent disk drive array data storage subsystems are used to emulate one or more physical devices shared between two control modules. The storage control units of the two data storage subsystems are interconnected by at least one data link to exchange control and data signals therebetween. The storage control units of both data storage subsystems are synchronized to maintain identical virtual device images of certain assigned virtual devices both of the data storage subsystems wherein the duplicated data records of the single virtual device are stored. The data records are therefore stored in available memory on both of the two data storage subsystems. Data is exchanged over the data link to maintain consistency of the two sets of mapping tables.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.