How to check RAID configuration in Linux

To check the RAID configuration on a Linux system, you can use the mdadm command. This command is used to manage Linux MD (Multiple Device) devices, which are used to create software RAID arrays.

To check the RAID configuration on a Linux system, open a terminal window and run the following command:

mdadm --detail --scan

The mdadm command will display a list of all MD devices on the system, including the device name, the RAID level, the number of devices in the array, and the status of each device.

For example, the output might look something like this:

ARRAY /dev/md0 level=raid1 num-devices=2 metadata=1.2 name=server:0 UUID=59b9c7c7:a5b5f9af:d5b1a0a4:28cc4d2b
   devices=/dev/sda1,/dev/sdb1

In this example, the system has an MD device named /dev/md0, which is a RAID 1 array with two devices (/dev/sda1 and /dev/sdb1). The RAID level is raid1, which indicates that the array is a mirror, with data replicated across both devices.

To check the status of a specific MD device, you can use the mdadm command with the --detail option and the name of the device.

For example, to check the status of the /dev/md0 device, you can use the following command:

mdadm --detail /dev/md0

This will display detailed information about the /dev/md0 device, including the RAID level, the number of devices in the array.