Detecting bogus IOs in a multipathing driver
US8621121B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 26, 2012 |
| Grant date | Dec 31, 2013 |
| Priority date | — |
| Expiry date | Sep 26, 2032 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F11/1443
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
An improved technique for processing IO requests has been described that distinguishes bogus IOs from genuine IO request failures by accessing a hardware configuration record that associates available paths with hardware components at different hardware layers traversed by the paths. When an IO request fails down a first path, a second path is selected for retrying the IO request by accessing the hardware configuration record and identifying a path that the record indicates traverses hardware components that are different from those traversed by the first path at multiple hardware layers. The chance that an IO request will fail due to faulty hardware over both the first path and the second path is thus low, such that IO failures down both the first path and the second path provide a clear indication that the IO request is bogus.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.