On Fri, Jan 22, 1999 at 02:42:45PM -0000, Brian S. Craigie wrote:
> On 22-Jan-99 [EMAIL PROTECTED] wrote:
> > 1) RAID 0+1 is creating two stripes, and mirroring one onto another.
> > RAID 1+0 is mirroring each drive to another, and striping across
> > the resulting volumes.
> >
> > They aren't the same thing. Really. They aren't.
>
> I'm reliably told 0+1 and 1+0 _are_ the same thing.
Whatever.
> Either way, you create
> stipes across a set of disks, and then mirror the set of disks to another set
> of disks. You can lose all the disks on one side of the mirror and still be
> operational.
>
> Raid 0 is striping, raid 1 is mirroring. There is logically only one way to
> combine the two correctly, ie you mirror your stripes. This is variably termed
> 0+1 or 1+0.
Not at all. There's two functions. There's two ways to order the functions.
1) A before B
2) B before A
striping and mirroring
1) mirror the stripes
2) stripe across the mirrors
> > with 0+1, the second drive you lose results in the loss of the data.
>
> Only if it's on the opposite side of the mirror from the first lost disk and on
> the same stripe.
>
> > with 1+0, you can lose one drive from each mirrored pair, and still
> > maintain data integrity. It's the no-compromise approach to RAID
> > sets.
>
> I think you mean raid 10? http://www.whatis.com/raid.htm says:-
Whatever... Read "RAID levels outlive their usefulness":
http://www.raid-advisory.com/rabguide.html
The terms aren't defined.
--
John White
[EMAIL PROTECTED]
PGP Public Key: http://www.triceratops.com/john/public-key.pgp
