I am reading an article on LWN and it has an important statement:
Raw devices (/dev/raw/rawN) are a special case of O_DIRECT I/O. These devices can be opened without specifying O_DIRECT, but still provide direct I/O semantics. As such, all of the same rules apply to raw devices that apply to files (or devices) opened with O_DIRECT.
Does this refer to what today is
/dev/sda and few others?