I have a system that was running Ubuntu 18.04 server with a 5 drive RAID 6 array using mdadm. I had a hard drive failure, but instead of the array it was the OS hard drive that completely failed. I also do not have access to the original mdadm.conf file. In an attempt to get my array back up, I booted Ubuntu 22.04 from a USB and tried to assemble and mount the array. It did not work. Trying some diagnostic steps I found online, it seems to be claiming that there is no md superblock on any of the drives. I've included the commands I ran and their output below. Does anyone have any advice on what next steps I can take? I have no reason to think these drives have failed mechanically (much less all of them). I also tried with Ubuntu 18.04 and got the same results. ubuntu@ubuntu:~$ lsblk NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT loop0 7:0 0 2.2G 1 loop /rofs loop1 7:1 0 32.3M 1 loop /snap/snapd/12883 loop2 7:2 0 55.4M 1 loop /snap/core18/2128 loop3 7:3 0 61.8M 1 loop /snap/core20/1081 loop4 7:4 0 65.1M 1 loop /snap/gtk-common-themes/1515 loop5 7:5 0 219M 1 loop /snap/gnome-3-34-1804/72 loop6 7:6 0 241.4M 1 loop /snap/gnome-3-38-2004/70 loop7 7:7 0 2.5M 1 loop /snap/gnome-calculator/884 loop8 7:8 0 704K 1 loop /snap/gnome-characters/726 loop9 7:9 0 548K 1 loop /snap/gnome-logs/106 loop10 7:10 0 2.5M 1 loop /snap/gnome-system-monitor/163 sda 8:0 0 9.1T 0 disk ├─sda1 8:1 0 9.1T 0 part └─sda9 8:9 0 8M 0 part sdb 8:16 0 9.1T 0 disk ├─sdb1 8:17 0 9.1T 0 part └─sdb9 8:25 0 8M 0 part sdc 8:32 0 9.1T 0 disk ├─sdc1 8:33 0 9.1T 0 part └─sdc9 8:41 0 8M 0 part sdd 8:48 0 9.1T 0 disk ├─sdd1 8:49 0 9.1T 0 part └─sdd9 8:57 0 8M 0 part sde 8:64 0 9.1T 0 disk ├─sde1 8:65 0 9.1T 0 part └─sde9 8:73 0 8M 0 part sdf 8:80 1 7.6G 0 disk └─sdf1 8:81 1 7.6G 0 part /cdrom ubuntu@ubuntu:~$ sudo mdadm --assemble /dev/sda1 /dev/sdb1 /dev/sdc1 /dev/sdd1 /dev/sde1 mdadm: device /dev/sda1 exists but is not an md array. ubuntu@ubuntu:~$ sudo mdadm --examine --verbose /dev/sd[a-e]1 mdadm: No md superblock detected on /dev/sda1. mdadm: No md superblock detected on /dev/sdb1. mdadm: No md superblock detected on /dev/sdc1. mdadm: No md superblock detected on /dev/sdd1. mdadm: No md superblock detected on /dev/sde1. ubuntu@ubuntu:~$ sudo mdadm --assemble --scan --verbose mdadm: looking for devices for further assembly mdadm: no recogniseable superblock on /dev/loop10 mdadm: no recogniseable superblock on /dev/loop9 mdadm: no recogniseable superblock on /dev/loop8 mdadm: Cannot assemble mbr metadata on /dev/sdf1 mdadm: Cannot assemble mbr metadata on /dev/sdf mdadm: no recogniseable superblock on /dev/sdb9 mdadm: no recogniseable superblock on /dev/sdb1 mdadm: Cannot assemble mbr metadata on /dev/sdb mdadm: no recogniseable superblock on /dev/sde9 mdadm: no recogniseable superblock on /dev/sde1 mdadm: Cannot assemble mbr metadata on /dev/sde mdadm: no recogniseable superblock on /dev/sdd9 mdadm: no recogniseable superblock on /dev/sdd1 mdadm: Cannot assemble mbr metadata on /dev/sdd mdadm: no recogniseable superblock on /dev/sdc9 mdadm: no recogniseable superblock on /dev/sdc1 mdadm: Cannot assemble mbr metadata on /dev/sdc mdadm: no recogniseable superblock on /dev/sda9 mdadm: no recogniseable superblock on /dev/sda1 mdadm: Cannot assemble mbr metadata on /dev/sda mdadm: no recogniseable superblock on /dev/loop7 mdadm: no recogniseable superblock on /dev/loop6 mdadm: no recogniseable superblock on /dev/loop5 mdadm: no recogniseable superblock on /dev/loop4 mdadm: no recogniseable superblock on /dev/loop3 mdadm: no recogniseable superblock on /dev/loop2 mdadm: no recogniseable superblock on /dev/loop1 mdadm: no recogniseable superblock on /dev/loop0 mdadm: No arrays found in config file or automatically Steve
