Raw device
In
database management system
can use raw devices directly, enabling them to manage how data is cached, rather than deferring this task to the operating system.
In FreeBSD, all device files are in fact raw devices. Support for non-raw devices was removed in FreeBSD 4.0 in order to simplify buffer management and increase scalability and performance.[1]
In Linux, opening a block device with the O_DIRECT flag replaces raw device usage. Raw devices were removed entirely from the Linux kernel in the 5.14 release.[2]
References
- ^ "FreeBSD Architecture Handbook: 9.4. Block Devices (Are Gone)". Retrieved 2017-06-29.
- ^ Hellwig, Christoph (2021-05-31). "remove the raw driver". Retrieved 2024-07-29.
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