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Removal of mdadm RAID Devices – How to do it quickly?

by | Sep 13, 2021

Removal of mdadm RAID Devices is quite easy. It involves a quick 6 steps.

As part of our Server Management Sevices, we assist our customers with several Mdadm queries.

Today, let us see how our support techs remove the same.

Removal of mdadm RAID Devices

In order to remove the mdadm RAID Devices our Support Techs recommend the following steps:

Step 1: Unmount and Remove all Filesystems

We need to make sure all filesystems have been unmounted. For that, we use umount. It also ensures we have exclusive access to the disk.

umount /dev/md1

Step 2: Determine mdadm RAID Devices

To do so, we run the following command:

cat /proc/mdstat

cat /proc/mdstat

For example, the output will be like this:

md1 : active raid1 sdf1[1] sde1[0] 2929555456 blocks super 1.2 [2/2] [UU] bitmap: 0/22 pages [0KB], 65536KB chunk md0 : active raid10 sda1[3] sdd1[1] sdb1[0] sdc1[2] 976502784 blocks super 1.2 512K chunks 2 near-copies [4/4] [UUUU] 
unused devices: <none>

Now, we need to make sure we take a note of the disks that are part of the RAID group.

When we proceed to step 5, we will need the names.

Step 3: Stop mdadm RAID Device

Our next step is to stop the device.

mdadm –stop /dev/md1

For example, the output will look similar to this:

mdadm: stopped /dev/md1

Step 4: Remove mdadm RAID Device

mdadm –remove /dev/md1

At time, we may come across the following error:

mdadm: error opening md1: No such file or directory

Then, we go ahead with the following step.

Step 5: Remove the Superblocks

mdadm –zero-superblock /dev/sdf1 /dev/sde1

Step 6: Verify RAID Device Was Removed

Finally, we use lsblk and cat /proc/mdstat and confirm there are no active RAID devices.

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Conclusion

To conclude, here, we saw how our Support Techs perform the removal of mdadm RAID Devices.

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