Seamless takeover of a stateful protocol session in a virtual machine environment
US9600315B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 22, 2010 |
| Grant date | Mar 21, 2017 |
| Priority date | — |
| Expiry date | Jan 8, 2035 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F11/2043
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
The disclosed technique uses virtual machines in solving a problem of persistent state for storage protocols. The technique provides for seamless, persistent, storage protocol session state management on a server, for higher availability. A first virtual server is operated in an active role in a host system to serve a client, by using a stateful protocol between the first virtual server and the client. A second, substantially identical virtual server is maintained in a passive role. In response to a predetermined event, the second virtual server takes over for the first virtual server, while preserving state for a pending client request sent to the first virtual server in the stateful protocol. The method can further include causing the second virtual server to respond to the request before a timeout which is specific to the stateful protocol can occur.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.