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Thread: growing a raid-6 with mdadm

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i have raid-6. contains 4 1.5tb drives , wanting add 2 other 1.5tb drives. however, i'm having problem doing so.

current raid @ /dev/md0. able run
code:
mdadm --add /dev/md0 /dev/sda1  mdadm --add /dev/md0 /dev/sdb1
this successful, can see both of these drives listed spares raid. next step run
code:
mdadm --grow /dev/md0 /dev/sda1  mdadm --grow /dev/md0 /dev/sdb1
however, when doing received error
code:
mdadm: can add devices linear arrays
it understanding add arrays raid-6. i've searched solutions this, ones read, didn't seem relevant error. tried doing in gui utility well, wouldn't allow me add drives.

looked guides on this, seemed relate other raid sets , not -6, thought ask here, want make sure not lose data.

i'm running ubuntu 10.10 kernel 2.6.35-30-generic




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