mdadm (Multiple Disk and Device Management) - manage MD devices aka Linux
Software RAID
$ sudo apt-get install mdadm
syntax
$ sudo mdadm [mode] <raiddevice> [options] <component-devices>
To create RAID 0 array https://www.acnc.com/raid/?raid-level=0
$ sudo mdadm --create /dev/md0 --level=0 --raid-devices=2 /dev/sdc1
/dev/sdd1
To create RAID 1 array https://www.acnc.com/raid/?raid-level=1
$ sudo mdadm --create /dev/md1 --level=1 --raid-devices=2 /dev/sdc1
/dev/sdd1
To create RAID 5 array https://www.acnc.com/raid/?raid-level=5
$ sudo mdadm --create /dev/md5 --level=5 --raid-devices=3 /dev/sdc1
/dev/sdd1 /dev/sde1
To create RAID 10 array https://www.acnc.com/raid/?raid-level=10
$ sudo mdadm --create /dev/md2 --level=10 --raid-devices=3 /dev/sdc1
/dev/sdd1 /dev/sde1
To check if it is an md device or a component of an md array
$ sudo mdadm -Q /dev/md0
To print detail of md devices
$ sudo mdadm -D /dev/md0
To add the RAID arrays to the configuration file
$ sudo mdadm -D -s > /etc/mdadm.conf
To create a file system on a RAID drive
$ sudo mkfs.ext4 /dev/md0
To mount the RAID device
$ sudo mkdir /mnt/raid
$ sudo mount /dev/md0 /mnt/raid
To deactivate or delete a RAID array
first stop the RAID device
$ sudo mdadm -S /dev/md0
then
$ sudo mdadm --zero-superblock /dev/sdc1 /dev/sdd1
To add a disk to an existing array
$ sudo mdadm --add /dev/md0 /dev/sdc1
To remove a disk from an array
$ sudo mdadm /dev/md0 --fail /dev/sdb1 --remove /dev/sdb1
To assemble and start all arrays listed in the standard config file
$ sudo mdadm -A -s
To print help
$ sudo mdadm --help
$ sudo mdadm --create --help
$ sudo mdadm --assemble --help
$ sudo mdadm --build --help
$ sudo mdadm --manage --help
$ sudo mdadm --misc --help
$ sudo mdadm --grow --help
$ sudo mdadm --incremental --help
$ sudo mdadm --monitor --help
regards,
T.Dhanasekar
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