>
>
> On 6 Dec 1996, Andi Kleen wrote:
>
> > Nathan Bryant <nathan@burgessinc.com> writes:
> >
> > >
> > >
> > > I don't know about asynchronous I/O and locking shared memory, but linux
> > > does support raw partition devices, and always has.
> >
> > Linux doesn't support raw devices that aren't cached in the buffer
> > cache. I think he means this.
>
> The buffer cache should only increase performace. Unless Sybase uses its
> own caching algorithm, in which case the buffer cache is redundant. Is
> this the case?
The raw devices do lazy writing so that the DB can't be sure if the
data actually hit the disk. This lowers the reliability of the DB
in case of a crash.
-Andi