Method of maintaining task sequence within a task domain across error recovery
US7493617B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 5, 2004 |
| Grant date | Feb 17, 2009 |
| Priority date | — |
| Expiry date | Jul 19, 2026 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F11/2069
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
Tracks of data or other data units are copied from a primary storage system to a secondary storage system. For multiple-track or multiple-data unit transfers, a group of tracks or data units which are sequentially related are transferred. A respective task is defined at the primary storage system for monitoring a progress of the transfer of each of the respective data units in a group. A state is maintained for monitoring a progress of the transfer of the group responsive to the progress of each of the tasks. A normal state is selected when there are no failed tasks. A recovery state is selected when there is a failure, and the status of the remaining tasks is being ascertained. A retry state is selected following the recovery state to retry the failed tasks. A failed state indicates an unrecoverable failure.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.