Re: Linux Buffer Cache Does Not Support Mirroring

Gerard Roudier (
Tue, 2 Nov 1999 22:31:50 +0100 (MET)

On Mon, 1 Nov 1999, Alan Cox wrote:

> > separate (Hotfix and mirrroing ARE independent of NWFS even in Netware),
> > however, there are fault tolerant dependencies that allow NWFS to handle
> > some very complex data failure and recovery conditions not available
> > with most other FS's. It is possible to implement without it, but then
> But can those be taught to another FS ?
> > drivers and the buffer cache. There's no obvious method of supporting
> > async callbacks (which will increase file system performance by several
> > hundred percent).
> This is callbacks on an I/O completion ? So you can execute some piece of fs
> code in driver context ?

Callbacks on completion may help to order. What help IO performances on
heavily loaded system is likely to defer, since this allows coalescence
and IO sorting at O/S level. Still I donnot follow completely Jeff's


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