On 04.07.2013 01:24, NeilBrown wrote:

I think you are just talking about making the devices bigger without
increasing the number of devices.
This possible for RAID10 as long as it uses a 'near' or 'offset' layout.  It
is not support for 'far' layout RAID10.

And as I just found out after some googling, growing RAID10 requires at 
least kernel 3.4rc. I have Ubuntu 12.04, which has kernel 3.2

I'm now thinking I could use a parted magic live cd to grow the array, 
and then continue using it with my current linux distribution. Am I 
right in this assumption? Or have I missed something?

Thanks, Chris