Method and apparatus for efficiently destaging sequential I/O streams
US8930619B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 21, 2014 |
| Grant date | Jan 6, 2015 |
| Priority date | — |
| Expiry date | Aug 21, 2034 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F2212/262
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A method for destaging write data from a storage controller to storage devices is provided. The method includes determining that a cache element should be transferred from a write cache of the storage controller to the storage devices, calculating that a dirty watermark is above a dirty watermark maximum value, identifying a first cache element to destage from the write cache to the storage devices, transferring a first data container including the first cache element to the storage devices, and incrementing an active destage count. The method also includes repeating determining, calculating, identifying, transferring, and incrementing if the active destage count is less than an active destage count maximum value. The active destage count is a current number of write requests issued to a virtual disk that have not yet been completed, and the virtual disk is a RAID group comprising one or more specific storage devices.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.