Method and system for preventing data loss within disk-array pairs supporting mirrored logical units
US7058850B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jul 31, 2002 |
| Grant date | Jun 6, 2006 |
| Priority date | — |
| Expiry date | Feb 25, 2024 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F11/2064
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
An additional communications link between two mass-storage devices containing LUNs of a mirrored-LUN pair, as well as incorporation of a fail-safe mass-storage-device-implemented retry protocol to facilitate non-drastic recovery from communications link failures within the controllers of the two mass-storage devices, prevents build-up of WRITE requests in cache and subsequent data loss due to multiple communications-link and host computer failures. The combination of the additional link and the retry protocol together ameliorates a deficiency in current LUN-mirroring implementations that often leads to data loss and inconsistent and unrecoverable databases.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.