Re: Upgrading Raid1 array to have 2. disks.

[Anders Fugmann <afu@fugmann.dhs.org>]

Neil Brown wrote:
> You cannot add a new data drive to a raid1 array.
> If you shut down the array and re-create it you should not loose data.
> The correct command to use would be something like:
>   mdadm --create /dev/md0 --level=1 -n 2 /dev/ide/host0/bus0/target0/lun0/part1 missing
> 
> Note the word "missing" at the end.  This tells mdadm to create a
> 2-drive array with one missing drive (and so only one active drive).
> This will have the same data as the old md0.
> Now "mdadm --add" should do what you want.

Thanks for the replies.
The method above worked like a charm. The data on the array even surived 
the operation.

> 
> NeilBrown

Regards
Anders Fugmann