File system over fully provisioned volume file in direct mode
US9256603B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 28, 2013 |
| Grant date | Feb 9, 2016 |
| Priority date | — |
| Expiry date | Jan 21, 2034 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F16/1824
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A data storage system includes storage devices and a processing subsystem executing software forming a lower-deck file system and an upper-deck file system. The lower-deck file system presents a volume file from which storage is provided to the upper-deck file system, and units of storage of the storage devices are reserved to the upper-deck file system. The volume file is fully provisioned based on the reserved units of storage so that an out-of-space condition is not presented to the upper-deck file system. Reserved units of storage are dynamically added to the volume file to increase its allocated size in response to demand from the upper-deck file system, and a direct operating mode is used in which a block address in the lower-deck file system is obtained by a predetermined calculation from a corresponding block address in the volume file.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.