On Wed, Jun 05, 2002 at 12:53:41PM +0200, Jakob Østergaard wrote:
> > is having a 'consistency check' function in md, that would read from all disks
> > and even compare data or calculate parity for raid5, it could be scheduled
> > to run periodically with a very very low priority.
>
> This definitely belongs in user-space. But you are right, and I've discussed
> it with colleagues before as well - it would be a good thing to have such a
> tool.
>
> In root's crontab you could easily just put a 'dd if=/dev/hda of=/dev/null' and
> so on for all your drives. No need for kernel extensions here...
>
well, yes and no
a kernel thread could do compare and check parity and also
when we have the support for this in md try to do a write and
see if the disk error correction code can relocate the bad sector.
also a 'dd if=/dev/hda of=/dev/null' would just sit a production
machine, while we could give it a minumum and maximum bandwidth
to use like we do in reconstruction.
L.
--
Luca Berra -- bluca@comedia.it
Communication Media & Services S.r.l.
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