Thank you, jools, for the info that the raid can be used right away, I did not know that. It's not mentioned on any of the many guides I've been through..
Anyway, the bug was about mdadm creating "md_d0" and similar devices when I delete the original raid, even if I clear the disk. It seems like mdadm has trouble forgetting the raid on a disk, and when trying to clear the superblocks (after deleting the raid), I get no error. But it still seem to be some kind of info stored either in the OS, or on the disks. I just bought a couple of large disks that is synchronizing just now, but when they are done, I'll try again with my 500GB test disks, and try to describe more step-by-step whats going on. Basically what I did was this: Create a raid: mdadm --create --verbose /dev/md0 --level=1 /dev/sda1 /dev/sdb1 That failed with "no raid devices found" or something like that (don't remember the exact words), so I ran this instead: mdadm -Cv /dev/md0 -l1 -n2 /dev/sd[ab]1 And that worked, and started synchronizing. Then, after a reboot, the device /dev/md_d0 appeared instead of /dev/md0. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/828421 Title: Create new RAID1 array without resync To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/mdadm/+bug/828421/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
