Linux RAID Devices

To list disk

parted -l |grep sd #sd-scsi disks

Use in command line

parted parted /dev/sdb print

Creating a raid5

mdadm -Cv /dev/md0 --level=5 -n3 /dev/sdb1 /dev/sdc1 /dev/sdd1 mdadm --detail /dev/md0

Use the command below to create a copy of the partition of an existing disk then format then use mdadm --add to the array.

sfdisk -d /dev/ |sfdisk /dev/ Example: sfdisk -d /dev/sda | sfdisk /dev/sdb

Fail a disk

mdadm /dev/md0 -f /dev/sdb1

Remove a disk

mdadm /dev/md0 -r /dev/sdb1

Add a disk

mdadm /dev/md0 -a /dev/sdb1

Stopping md

mdadm --stop /dev/md0 

Start md

mdadm --assemble --scan

Saving mdadm config

echo 'DEVICE /dev/sd*' > /etc/mdadm.conf mdadm --detail --scan >> /etc/mdadm.conf

Removing array

mdadm -S /dev/md0 >> stop md mdadm --zero-superblock /dev/sdb1 mdadm --zero-superblock /dev/sdc1

Creating RAID 0

mdadm -Cv /dev/md0 --level=0 -n2 /dev/sdb1 /dev/sdc1

Creating RAID 1

mdadm -Cv /dev/md0 --level=1 -n2 /dev/sdb1 /dev/sdc1

Creating RAID 5

mdadm -Cv /dev/md0 --level=5 -n3 /dev/sdb1 /dev/sdc1 /dev/sdd1 --spare-disk=1 /dev/sde1