On Wed, 17 Jul 2013 13:01:15 +0000 (UTC) Boyan Alexiev <alexiev@xxxxxxxxxxxx> wrote: > If You have array with 9 devices and add another one You may at same time > grow array and change raid level. In this case You not need backup file. > Please try this: > mdadm --grow /dev/md0 --raid-devices=10 --level=6 > You can only skip the backup file if you are increasing the number of *data* devices. I don't think your example does that. (However with mdadm-3.3 this problem goes away if you have a new enough kernel). NeilBrown
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