I have three drives sda, sdb, and sdc:$ lsblkNAME   MAJ:MIN RM  SIZE RO TYPE MOUNTPOINTsda      8:0    0  2.7T  0 disk sda1   8:1    0    1M  0 part sda2   8:2    0  500M  0 part sda3   8:3    0 97.7G  0 part /sda4   8:4    0  2.5T  0 part sdb      8:16   0  2.7T  0 disk sdb1   8:17   0    1M  0 part sdb2   8:18   0  500M  0 part /bootsdb3   8:19   0 97.7G  0 part sdb4   8:20   0  2.5T  0 part sdc      8:32   0  2.7T  0 disk /homeThe first two I'm trying to aseemble into a RAID 1 array with the command:mdadm --create --verbose /dev/md0 --level=mirror --raid-devices=2 /dev/sda /dev/sdb -e 1.0using the 1.0 specification and (supposedly) writing the superblock at the end of the disk. However when I do this from a LiveUSB key, and reboot into sda, the array is gone. Actually if I reboot into the LiveUSB key the array is also not there, and mdadm --assemble --scan -v produces:$ sudo mdadm --assemble --scan -vmdadm: looking for devices for /dev/md0mdadm: no RAID superblock on /dev/sdd2mdadm: no RAID superblock on /dev/sdd1mdadm: no RAID superblock on /dev/sddmdadm: no RAID superblock on /dev/sdcmdadm: no RAID superblock on /dev/sdb4mdadm: no RAID superblock on /dev/sdb3mdadm: no RAID superblock on /dev/sdb2mdadm: no RAID superblock on /dev/sdb1mdadm: no RAID superblock on /dev/sdbmdadm: no RAID superblock on /dev/sda4mdadm: no RAID superblock on /dev/sda3mdadm: no RAID superblock on /dev/sda2mdadm: no RAID superblock on /dev/sda1mdadm: no RAID superblock on /dev/sdamdadm: cannot open device /dev/sr0: No medium foundBut I just wrote the superblock! I even waited overnight for the array to assemble itself. And now it's like I never ran --create. I also read the Linux RAID Wiki, which suggests that I should save /etc/mdadm.conf (on Fedora), which I did with mdadm --detail --scan > /mnt/etc/mdadm.conf from the LiveUSB, after the create command, which produced:$ cat /etc/mdadm.conf                                                                                                                                                                                              ARRAY /dev/md0 metadata=1.0 name=manjaro:0 UUID=18fc0efb:50eb619e:621e8eee:8d1cd68dWhat gives? Why is create not actually creating anything? Am I missing some options to commands? If you guys need more input from me please don't hesitate to ask for output of commands in the comments :)!Thanks for your time and input!UPDATE 1$ sudo parted /dev/sda unit s print free[sudo] password for rivanov: Error: The backup GPT table is corrupt, but the primary appears OK, so    that will be used.OK/Cancel? ok                                                             Model: ATA WDC WD3003FZEX-0 (scsi)Disk /dev/sda: 5860533168sSector size (logical/physical): 512B/4096BPartition Table: gptDisk Flags: Number  Start        End          Size         File system  Name  Flags        34s          2047s        2014s        Free Space 1      2048s        4095s        2048s                              bios_grub 2      4096s        1028095s     1024000s     ext4               raid 3      1028096s     205828095s   204800000s   ext4               raid 4      205828096s   5530423295s  5324595200s  ext4               raid        5530423296s  5860533134s  330109839s   Free Space$ sudo mdadm --examine /dev/sda /dev/sdb/dev/sda:   MBR Magic : aa55Partition[0] :   4294967295 sectors at            1 (type ee)/dev/sdb:   MBR Magic : aa55Partition[0] :   4294967295 sectors at            1 (type ee)
mdadm - Creating RAID1 on LiveUSB does not persist when re-booting
fedora;software raid;cloning;raid1;mirror