Data storage system providing asymmetric multipath storage access
US9985873B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 10, 2015 |
| Grant date | May 29, 2018 |
| Priority date | — |
| Expiry date | Aug 10, 2036 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L67/1097
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A data storage system provides asymmetric multi-path access to a storage device from a host computer using a storage protocol such as SCSI. Device state information is maintained indicating that one path of set of paths between the host computer and the storage device is a non-fully-functional path. In response to receiving device discovery commands from the host computer on the one path and the one path being indicated to be a non-fully-functional path, the data storage system returns respective good responses indicating that the storage device is accessible to the host computer via the non-fully-functional path. However, in response to receiving a test unit readiness command from the host computer on the one path and the one path being indicated to be a non-fully-functional path, an error response is returned which causes the host computer to select an alternative path of the set of paths for the data transfer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.