Create Raid Configuration File ( /etc/mdadm.conf ) – Linux


RAID refers to a redundant array of independent disks; it helps you to combine multiple storage disks into a single logical unit. Data is distributed to across disks, depends upon Raid level used. Normally Linux system doesn’t automatically remember all the components that are part of the RAID set. This information has to be added it on mdadm.conf file under /etc directory. It helps to start , rebuild,re-activate the raid etc.., by default, the file will not be available, it has to be created manually.

Use the following command to scan the availbe RAID levels on the system.

[root@SRV01 ~]# mdadm –detail –scan

ARRAY /dev/md level=raid1 num-devices=2 UUID=59bbce04:74f9376a:e78e164b:9897f07b

Check the Raid details.

[root@SRV01 ~]# mdadm –detail /dev/md0


Version : 00.90.03

Creation Time : Thu Dec 2 20:21:44 2010

Raid Level : raid1

Array Size : 20971456 (20.00 GiB 21.47 GB)

Used Dev Size : 20971456 (20.00 GiB 21.47 GB)

Raid Devices : 2

Total Devices : 2

Preferred Minor : 0

Persistence : Superblock is persistent

Update Time : Thu Dec 2 20:21:44 2010

State : clean

Active Devices : 2

Working Devices : 2

Failed Devices : 0

Spare Devices : 0

UUID : 59bbce04:74f9376a:e78e164b:9897f07b

Events : 0.1

Number Major Minor RaidDevice State

0 8 32 0 active sync /dev/sdc1

1 8 48 1 active sync /dev/sdd1

Append or Create the configuration file.

[root@SRV01 ~]# mdadm –detail –scan > /etc/mdadm.conf

View the configuration file.

[root@SRV01 ~]# vi /etc/mdadm.conf

ARRAY /dev/md0 level=raid1 num-devices=2 UUID=59bbce04:74f9376a:e78e164b:9897f07b

That’s All.

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  • salsaman

    Useful information, thank you! Fwiw the blue-on-gray shell output is illegible without selecting it 🙂