Re: raid1 w/ 3 active mirrors?

["Gordon Mohr (@ Bitzi)" <gojomo@bitzi.com>]

Laurent CARON wrote:
> Gordon Mohr (@ Bitzi) a écrit :

>> How do you make all the disks active mirrors? When I add a third 
>> partition
>> to an functioning RAID1 array (mdadm -a), it always enters as a 
>> 'spare'. Only
>> after another disk fails out will it be brought into sync with the 
>> remaining
>> active partition.
>>
>> (I'd like the third partition to be brought into sync, and kept in sync,
>> with the other two immediately, so that a fail does not trigger any
>> flurry of activity.)

> when you create the array:
> 
> mdadm -Cv /dev/md0 -l1 -n10 /dev/sd{a,b,c,d,e,f,g,h,i,j}1

Thanks for the tip.

I'm hoping to do this to a prexisting array, so I'll probably need
to use --grow rather than -C together with -n/--raid-devices, but
you've pointed me in the right direction and I'll try this soon.

Merci!

- Gordon @ Bitzi
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