# fdisk /dev/sdb
Command (m for help): d
Command (m for help): n
Command (m for help): n
Partition type
p primary (0 primary, 0 extended, 4 free)
e extended (container for logical partitions)
Select (default p): Enter
Using default response p.
Partition number (1-4, default 1): Enter
First sector (2048-1953525167, default 2048): Enter
Last sector, +sectors or +size{K,M,G,T,P} (2048-1953525167, default 1953525167): Enter
Created a new partition 1 of type 'Linux' and of size 931.5 GiB.
Command (m for help): t
Hex code (type L to list all codes): fd
Changed type of partition 'Linux' to 'Linux raid autodetect'.
Command (m for help): p
Disk /dev/sdd: 931.5 GiB, 1000204886016 bytes, 1953525168 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0xd6944a98
Device Boot Start End Sectors Size Id Type
/dev/sdd1 2048 1953525167 1953523120 931.5G fd Linux raid autodetect
Command (m for help): w
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# fdisk /dev/sdd
.... Repeat as above .....
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# mdadm --create /dev/md0 --level=1 --raid-devices=2 /dev/sdb1 /dev/sdd1
mdadm: /dev/sdb1 appears to contain an ext2fs file system
size=976761560K mtime=Mon Dec 16 04:10:49 2019
mdadm: Note: this array has metadata at the start and
may not be suitable as a boot device. If you plan to
store '/boot' on this device please ensure that
your boot-loader understands md/v1.x metadata, or use
--metadata=0.90
mdadm: /dev/sdd1 appears to contain an ext2fs file system
size=976761560K mtime=Mon Dec 16 04:10:49 2019
Continue creating array? y
mdadm: Defaulting to version 1.2 metadata
mdadm: array /dev/md0 started.
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# if you want to remove md0
mdadm --stop /dev/md0
mdadm --remove /dev/md0
mdadm --zero-superblock /dev/sdb1 /dev/sdd1
mdadm --detail /dev/md0
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# for /boot
mdadm --create /dev/md0 --level=1 --raid-devices=2 /dev/sdb1 /dev/sdd1 --metadata=0.90
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# mkfs.ext4 /dev/md0
mke2fs 1.44.3 (10-July-2018)
Creating filesystem with 244157360 4k blocks and 61046784 inodes
Filesystem UUID: 8642383a-ab03-4cfc-aa08-fac31f6d6e0b
Superblock backups stored on blocks:
32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208,
4096000, 7962624, 11239424, 20480000, 23887872, 71663616, 78675968,
102400000, 214990848
Allocating group tables: done
Writing inode tables: done
Creating journal (262144 blocks): done
Writing superblocks and filesystem accounting information: done
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mdadm --detail /dev/md0
mkdir /D10T1
mount /dev/md0 /D10T1
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