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Old 09-20-2011, 03:10 PM   #1
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Registered: Sep 2011
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growing raid-6 with mdadm

I currently have a soft raid 6 setup using mdadm and lvm. I'm trying to grow the raid 6, but am having issues. I upgraded to Ubuntu 11.10b, as in hopes of a kernel upgrade, it would fix my issue. However, I'm still unable to expand my raid.

If I cannot expand my raid, I'm open to other suggestions, possibly creating a mirrored raid and then adding it to the raid 6 to appear as 1 drive..? Here are the steps I took

copied the partions from the current to the new
sfdisk -d /dev/sdc | sfdisk /dev/sda
sfdisk -d /dev/sdc | sfdisk /dev/sdb
added the two drives to the raid
mdadm --add /dev/md0 /dev/sda1
mdadm --add /dev/md0 /dev/sdb1
set the max size
mdadm --grow /dev/md0 --size=max
then tried to grow the raid by doing
mdadm --grow /dev/md0 /dev/sda1
mdadm --grow /dev/md0 /dev/sdb1
on both of those lines, i got this error
mdadm: can only add devices to linear arrays
I've tried searching around for possible solutions, but have been unlucky in my search.


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