Storage controller and method for improved failure recovery using cross-coupled cache memories and nonvolatile stores
US5771367A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 30, 1995 |
| Grant date | Jun 23, 1998 |
| Priority date | — |
| Expiry date | Oct 30, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F11/20
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
An improved storage controller and method for storing and recovering data. The storage controller includes a first cluster for directing data from a host computer to a storage device and a second cluster for directing data from a host computer to a storage device. A first cache memory is connected to the first cluster and a second cache memory is connected to the second cluster. A first nonvolatile memory is connected to the second cluster and a second nonvolatile memory is connected to the first cluster. The first and second cache memories and the first and second nonvolatile stores are thus "cross-coupled" to the first and second clusters to provide improved data recovery capability. Data is directed to the first cache and backed up to the first nonvolatile memory in a first operational mode. In the event of failure of the first nonvolatile memory, data is recovered from the first cache memory. In a particular embodiment, in the event of failure of the first nonvolatile memory, data is directed from the first cache memory to the second cache memory. The cache memories and nonvolatile stores may also be formed on separate power boundaries. By allowing for use of the first cache af…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.