System, apparatus and method providing adaptive write policy for disk array controllers
US6760807B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 14, 2001 |
| Grant date | Jul 6, 2004 |
| Priority date | — |
| Expiry date | Feb 4, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F11/2097
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
Adaptive write policy for handling host write commands to write-back system drives in a dual active controller environment. Method for adaptive write policy in data storage system, where data storage system includes host system connected to primary controller and alternate controller. Controllers are coupled to system drive that includes one or more disk storage devices. Primary is connected to first memory and alternate is connected to second memory. Primary and alternate manage data storage system in dual-active configuration. Primary controller receives host write command from host system and write data request includes host write data. When system drive is configured with write-back policy, primary determines whether host write command encompasses an entire RAID stripe, and if so, primary processes host write command in accordance with write-through policy. Otherwise, primary processes command in accordance with write-back policy. Reduces amount of host write data that has to be mirrored to alternate controller.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.