Supporting live migration of virtual machine components with SCSI-3 persistent reservation fencing enabled
US8977888B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Nov 26, 2012 |
| Grant date | Mar 10, 2015 |
| Priority date | — |
| Expiry date | Apr 30, 2033 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F2201/815
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
Reservation conflicts are resolved in a clustering and storage system with SCSI-3 PR fencing enabled. For each specific node, all paths to shared storage are registered with a unique key. Only registered nodes can access the shared storage, and only one reservation can exist amidst multiple registrations. A command failure with a reservation conflict resulting from an attempt to access the shared storage is detected. In response, it is determined whether the specific node is registered with its unique key. If so, it is determined that the node is not fenced off from the shared storage, and the reservation conflict is to be resolved. To do so, the node is re-registered for all paths to the shared storage with the node's unique key. The failed command is then re-started. If the node is not registered, it is determined that the node is fenced off.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.