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RAID 0
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Stripes data evenly across two or more disks.
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RAID 1
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Mirrors data on two or more disks.
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RAID 2
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Rarely used, Bit-level striping with Hamming code for error correction.
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|
RAID 3
|
Rarely used, byte-level striping with a dedicated parity.
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|
RAID 4
|
Block-level striping with dedicated parity.
|
|
RAID 5
|
Block-level striping with distributed parity.
|
|
RAID 6
|
Block-level striping with double distributed parity.
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|
Number
|
Description
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Efficiency
|
|
RAID 01
|
Block-level striping, and mirroring without parity
|
1/stripes
|
|
RAID 10
|
Mirroring without parity, and block-level striping
|
stripes/n
|
|
RAID 50
|
Block-level striping with distributed parity, and block-level striping
|
(1-stripes)/n
|
|
RAID 60
|
Block-level striping with double distributed parity, and block-level striping
|
(1-2*stripes)/n
|
|
DISCLAIMER: PROCEED WITH CAUTION.
|
|
MAKE SURE YOU KNOW WHAT DISK YOU ARE OPERATING ON. IT IS VERY EASY TO DO IRREVOCABLE DAMAGE TO YOUR SYSTEM IF YOU DON'T.
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0. Figure out disk location in the file system:
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lsblk -o name,size,fstype,type,mountpoint |
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1. Formatting with fdisk
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sudo fdisk /dev/sdx |
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2. Navigatng fdisk: just press the following keys when promted to create new linux RAID type primary partition
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n, p, 1, Enter, Enter, t, fd, w |
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3. Repeat steps 1 and 2 for each disk that will be included in new array
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sudo fdisk /dev/sdy |
n, p, 1, Enter, Enter, t, fd, w |
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Create a mirrored array
|
|
mdadm --create /dev/md0 --level=1 /dev/sdx1 /dev/sdy1
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Assemble an existing array
|
mdadm --assemble /dev/md0 /dev/sdx1 /dev/sdy1 |
mdadm --scan --assemble --uuid=<UUID> |
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Find the active arrays
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cat /proc/mdstat |
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Unmount the array
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sudo umount /dev/md0 |
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Stop and remove the array
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mdadm --stop /dev/md0 |
mdadm --remove /dev/md0 |
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Find the devices used to build the array
|
lsblk -o name,fstype,mountpoint |
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Zero out the respective superblocks
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sudo mdadm --zero-superblock /dev/sdx |
sudo mdadm --zero-superblock /dev/sdy |
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Remove persistent references to the array
|
sudo nano /etc/fstab |
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Comment out or remove the reference to the array.
|
# /dev/md0 /mnt/md0 ext4 defaults,nofail,discard 0 0 |
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In
/etc/mdadm/mdadm.conf comment out or remove the array reference |
sudo nano /etc/mdadm/mdadm.conf |
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Comment out the reference
|
# ARRAY /dev/md0 metadata=1.2 name=mdadmwrite:0 UUID=xxxx |
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