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  • I think it's not posiible to live migrate from raid 6 to 10. from 5 to 0 it's possible but you need to decrase array size, and filesystem size. Creating new array will be quickly as converting. Commented Jun 11, 2017 at 10:39
  • @KrzysztofStasiak I have already live migrated from raid6 -> raid5, and I have decreased the array size. Since I'm using GPT on top of the array, resizing the actual data is a bit more tricky (and throws up many scary errors), but the error message saying the array was too large has been replaced with the error. The difficulty I'm having is in removing disks. Commented Jun 11, 2017 at 10:42
  • Do you decrease file system size before change array size? Is migration from 6 to 5 ended success? Commented Jun 11, 2017 at 10:47
  • @KrzysztofStasiak The migration went fine between raid6 and raid5, and I lost no data. Commented Jun 11, 2017 at 10:50
  • Ok, you have raid5 on 6 disk. I think you need to decrase filesystem size to 3 disk, and then migrate to raid0 with 3 drives. and then migrate to 10 specyfing 6 disk. Commented Jun 11, 2017 at 10:59