Maintaining data consistency in mirrored cluster storage systems using bitmap write-intent logging
US8046548B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 11, 2008 |
| Grant date | Oct 25, 2011 |
| Priority date | — |
| Expiry date | Jan 21, 2030 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F2201/88
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
Techniques for maintaining mirrored storage cluster data consistency can employ write-intent logging. The techniques can be scaled to any number of mirror nodes. The techniques can keep track of any outstanding I/Os, data in caches, and data that has gone out of sync between mirrored nodes due to link failures. The techniques can ensure that a power failure on any of the storage nodes does not result in inconsistent data among the storage nodes. The techniques may keep track of outstanding I/Os using a minimal memory foot-print and having a negligible impact on the I/O performance. Properly choosing the granularity of the system for tracking outstanding I/Os can result in a minimal amount of data requiring transfer to synchronize the mirror nodes. The capability to vary the granularity based on physical and logical parameters of the storage volumes may provide performance benefits.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.