Virtual machine fault tolerance
US8201169B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 15, 2009 |
| Grant date | Jun 12, 2012 |
| Priority date | — |
| Expiry date | Nov 19, 2030 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F2201/82
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
In a computer system running a primary virtual machine (VM) on virtualization software on a primary virtualized computer system (VCS) and running a secondary VM on virtualization software on a secondary VCS, a method for the secondary VM to provide quasi-lockstep fault tolerance for the primary VM includes: as the primary VM is executing a workload, virtualization software in the primary VCS is: (a) causing predetermined events to be recorded in an event log, (b) keeping output associated with the predetermined events pending, and (c) sending the log entries to the virtualization software in the secondary VCS; as the secondary VM is replaying the workload, virtualization software in the secondary VCS is: (a) sending acknowledgements indicating that log entries have been received; (b) when the virtualization software encounters one of the predetermined events, searching the log entries to determine whether a log entry corresponding to the same event was received from the primary VCS, and if so, comparing data associated with the predetermined event produced by the secondary VM with that of the primary VM; if there is a match, the virtualization software in the secondary VCS transmit…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.