Time delayed auto-premigeration of files in a virtual data storage system
US6067599A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 29, 1997 |
| Grant date | May 23, 2000 |
| Priority date | — |
| Expiry date | May 29, 2017 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S707/99955
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A virtual data storage system provides a method and apparatus for premigrating host-originated data files initially stored in a cache storage to selected storage volumes within a storage subsystem. A premigration list includes an entry for each cache data file eligible to be premigrated, or copied, to the storage subsystem. Each entry includes a data file identifier, a cache storage location, and a premigration delay criterion. The purpose of the premigration delay criterion is to ensure that the data files are written to the storage subsystem in a timely manner, but to also allow the host processing system to subsequently re-access data files written to the virtual data storage system without interference and delay from the premigration process. The cache data files are not premigrated until the corresponding premigration delay criterion has elapsed, or exceeded a predetermined threshold. In this manner, the premigration delay criterion can be adjusted as warranted by the performance of virtual data storage system or the host processing system.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.