On Wed, 18 Apr 2012 10:07:37 +0800 Jack Wang <jack.wang.usish@xxxxxxxxx> wrote: > Dear Neil, > > Thanks for your good works. > One query about current grow supporting status: > > as the raid wiki show : the RAID level 1/4/5/6 array can be grown . In > my test I can grow raid 1 add disk or remove disk through mdadm grow, > but change level from 1 to 4 or 5 will fail. the simaliar command work > for change level between 4/5/6, change 1 to 10 fail too. > > My kernel version is 3.2.15. mdadm version 3.2.3. You can definitely change from RAID1 to RAID5 and I think to RAID4. But you are right that you cannot change RAID1 to RAID10 yet. That should be easy enough to add, and now that RAID10 can be reshaped, it would make sense. NeilBrown
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