On Thursday June 1, [EMAIL PROTECTED] wrote:
>
> Theo,
>
> On Wed, 31 May 2000, Theo Van Dinter wrote:
> > On Wed, May 31, 2000 at 09:10:30AM -0400, Andy Poling wrote:
> > > That's the error you will get any time that you try to layer raid levels
> > > that md does not support layering. It's a safety belt mechanism of sorts.
> >
> > Arguably, any combination should be allowed, but 0+1 and 1+0 at minimum.
>
> So, is 0+1 the only combination currently allowed?
Just to set the record straight, no layering of RAID arrays works with
the 2.2patch set.
0+1 (meaning a mirrored set of striped sets) appears to work, until a
drive fails.
On drive failure, the RAID system attempts to remove one of the
underlying drives from the overlying mirrored set, fails to find it,
and dies.
An instance of this was reported on linux-raid a week ago or so.
If you want to lookin an archive, the subject line was
"Disk failure->Error message indicates bug"
>
> If so, is anybody working on allowing other combinations?
>
> Is anybody else interested in seeing 1+0, 5+0, etc?
2.4, when if comes out, should be able to support all combinations,
both raid with raid and raid with lvm. But it doesn't yet (I have a
patch that I am working on).
NeilBrown
>
> Regards,
>
> Corin
