On 30/05/07, [EMAIL PROTECTED] <[EMAIL PROTECTED]> wrote:
On Wed, 30 May 2007, Jonah H. Harris wrote:
> On 5/29/07, Luke Lonergan <[EMAIL PROTECTED]> 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
Good point, also if you had Raid 1 with 3 drives with some bit errors at
least you can take a vote on whats right. Where as if you only have 2 and
they disagree how do you know which is right other than pick one and hope...
But whatever it will be slower to keep in sync on a heavy write system.
Peter.
