Re: setting up raid10 with more than 4 drives

On Wed, 30 May 2007, Jonah H. Harris wrote:

> On 5/29/07, Luke Lonergan <llonergan@greenplum.com> wrote:
>>  AFAIK you can't RAID1 more than two drives, so the above doesn't make
>>  sense
>>  to me.
>
> Yeah, I've never seen a way to RAID-1 more than 2 drives either.  It
> would have to be his first one:
>
> D1 + D2 = MD0 (RAID 1)
> D3 + D4 = MD1 ...
> D5 + D6 = MD2 ...
> MD0 + MD1 + MD2 = MDF (RAID 0)
>

I don't know what the failure mode ends up being, but on linux I had no
problems creating what appears to be a massively redundant (but small) array

md0 : active raid1 sdo1[10](S) sdn1[8] sdm1[7] sdl1[6] sdk1[5] sdj1[4] sdi1[3] sdh1[2] sdg1[9] sdf1[1] sde1[11](S)
sdd1[0]
       896 blocks [10/10] [UUUUUUUUUU]

David Lang