Management of path operating mode transitions in multipathing host computer
US8977787B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 28, 2012 |
| Grant date | Mar 10, 2015 |
| Priority date | — |
| Expiry date | Jun 11, 2033 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L45/24
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A host computer accesses a storage volume via multiple paths and maintains path mode information identifying either an active or standby operating mode. An active-mode path is generally usable, and a standby-mode path is usable under exceptional conditions such as non-availability of an active-mode path. A reason identifier identifies a first operating condition causing the path to be placed in the standby mode. Upon a path-activating event for a standby-mode path, if there is a second operating condition indicating that the path should be maintained in the standby operating mode, then the path is maintained in the standby operating mode and the path mode information is set to identify the second operating condition, and otherwise the operating mode is set to active. A path-activating event can be a manual action by a user or automatic action such as expiration of an aging timer to re-attempt use of a standby path.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.