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Re: mdadm problem creating device

On Sun, Jan 06, 2008 at 03:38:29PM -0500, Douglas A. Tutty wrote:
> On Sun, Jan 06, 2008 at 02:53:57PM -0500, S Scharf wrote:
> > I installed a new disk and am trying to create a one disk raid 1 on it
> > (and will add the second disk later)
> > 
> > but when I run mdadm I get the followng:
> > 
> > $ sudo mdadm --create /dev/md0 --level=raid1 --raid-devices=2 /dev/sda3
> > missing
> > mdadm: /dev/sda3 is too small: 0K
> > mdadm: create aborted
> I'm just guessing here, since I set up my raid1 when I installed Etch,
> but you told it raid1 and you told it to use two devices but you only
> gave it one device.  What happens if you use --raid-devices=1?

OP is building a deprecated (I think that's the term) array. It seems
to be a common (I used it to build my array) way to migrate a
system. Put one of the two disk array on ide1 while your system is on
ide0. Then build the array with a disk missing. move data onto the
broken array, then add the other disk in and it will sync up. Pretty
slick trick really. 


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