On Thu, Mar 23, 2017 at 10:02:23PM +0100, Stephen Mueller wrote: > Looks like it worked! Thanks!
Well at least you could backup the data, just in case. > I used: > > sudo mdadm --create /dev/md0 --assume-clean --verbose --level-10 > --raid-devices=4 /dev/sdc /dev/sdd /dev/sde /dev/sdf I wonder about the assume-clean, but I would think any data you wrote will have been duplicated at the time you wrote it, and only unused space might not have been synced yet. Maybe running a forced resync would be worthwhile. > And I got my instructions for creating the array here, and they > also don't use partitions... > > https://www.digitalocean.com/community/tutorials/how-to-create-raid-arrays-with-mdadm-on-ubuntu-16-04 Well it works, as long as you don't leave anything around to confuse it, in this case a GPT partition table that somehow came back to bite you. I wonder if mdadm could perhaps warn about the existing partition table when being asked to create a new device. Does it survive reboots now? -- Len Sorensen
