On Tue, 12 Apr 2011 17:56:05 +0100 Mathias BurÃn <mathias.buren@xxxxxxxxx> wrote: > I'm approaching over 6.5TB of data, and with an array this large I'd > like to migrate to RAID6 for a bit more safety. That's a great decision (and I suppose you made a typo in the subject). RAID5 is downright dangerous at that disk count, and with disks of that size. > I'm just checking if I > understand this correctly, this is how to do it: > > * Add a HDD to the array as a hot spare: > mdadm --manage /dev/md0 --add /dev/sdh1 > > * Migrate the array to RAID6: > mdadm --grow /dev/md0 --raid-devices 7 --level 6 Looks correct to me... The first command can be just "mdadm --add /dev/md0 /dev/sdh1". If you'd rather avoid a reshape at this point, you can add "--layout=preserve" to the second line. That way you will have just a rebuild of the new drive, instead of a full reshape. You will also need to "--grow --bitmap=none" first (you can re-add the bitmap later). -- With respect, Roman
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