Method and system for efficient journal-based resynchronization
US7546485B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 15, 2006 |
| Grant date | Jun 9, 2009 |
| Priority date | — |
| Expiry date | Oct 9, 2027 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F11/2082
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
Various method and system embodiments of the present invention employ enhanced journal-based resynchronization for resynchronization of a primary volume to a remote secondary volume following restoration of a communications link or another event. Enhanced journal-based resynchronization involves maintaining a filled journal after the primary component system has resorted to bitmap-based journaling. Following communications-link restoration, or another event, enhanced resynchronization analyzes various values maintained by the primary component system to characterize the journaling state in order to determine whether or not to first merge the filled journal with the track-based bitmap before carrying out bit-map-based resynchronization, or to instead unspool the filled journal and transmit the unspooled WRITE requests to the second component system prior to separately carrying out bit-map-based resynchronization.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.