Ubuntu – New computer, same RAID. MDADM won’t assemble


Ubuntu 12.04 64. Hardware failure (motherboard) led me to build a new machine, and I took the opportunity to do a fresh install of Ubuntu (first one was a learning experience). I moved the raid disks over and am seeing them in Disk Utility as /dev/sdb and /dev/sdc with their volumes listed as "RAID Component".

However, when I try to mount them like so

sudo mdadm --assemble /dev/md0 /dev/sdb /dev/sdc

I get this error

mdadm: Cannot assemble mbr metadata on /dev/sdb
mdadm: /dev/sdb has no superblock - assembly aborted

Any ideas?

Best Answer

Solution: I followed the instructions found here: Move RAID1 to new machine

In effect, I had to disconnect the drives during the installation process, then the system detected them properly once it was up and running.

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