I'm newly back to Linux after >20 years. First install was with a beta kernel in ~1992.
I've build a home media server with a 4-drive RAID 5 array with the latest workstation version of Ubuntu (server install failed!?!). Set it up fine and started copying files to it with no problem.
Upon a reboot, the drive is gone, so I assume I didn't set something up properly to remount the drive upon reboot.
mdadm --assemble --scan
and nothing happens - no error message, and no array.
Then I tried:
mdadm --assemble /dev/md0 /dev/sdb /dev/sdc /dev/sdd /dev/sde mdadm: /dev/sdb is busy - skipping mdadm: /dev/sdc is busy - skipping mdadm: Cannot assemble mbr metadata on /dev/sdd mdadm: /dev/sdd has no superblock - assembly aborted
Does this mean that somehow /dev/sdd became damaged? Is there anything I can do short of repartitioning /dev/sdd?
The drives are all brand new - how can I check to see if the drive is bad?
Any help much appreciated!!