Re: wish for Linux MD mirrored raid types

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On Fri, May 06, 2011 at 01:31:59PM +0600, Roman Mamedov wrote:
> On Fri, 6 May 2011 09:17:52 +0200
> Keld Jørn Simonsen <keld@xxxxxxxxxx> wrote:
> 
> > I would like linux MD raid10 functionality to be part of the Linux MD
> > RAID1 module, and be called raid1. This is in accordance with the
> > use of the RAID1 term as standadized by SNIA. In fact the RAID10-offset
> > layout is an implementation of a SNIA RAID specification. The RAID10-near
> > layout is an implementation of a simple RAID layout. And the RAID10-far
> > layout is just another layout far a mirrored RAID.  So all these types
> > could just be defined as different RAID1 layouts.
> 
> RAID1 is RAID1, RAID10 is RAID10.
> RAID1 on 4 drives is very different from RAID10 on 4 drives.
> Don't add confusion by trying to rename RAID10 to RAID1.

How are they different?
Say what is the difference between a Linux MD RAID1 with 4 disks, and
the default Linux MD RAID10 with 4 disks? (in the near layout)?

Best regards
keld
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