LVM Part 4: RAID

📅 April 6, 2024
RAID (Redundant Array of Independent Disks) is available in Linux using mdadm, but did you know that RAID is also possible with LVM?

By default, LVM creates a linear logical volume, but we can create a RAID logical volume as well with RAID modes 0, 1, 4, 5, 6, and 10 (also known as 1+0).

How is RAID accomplished with LVM?

PCIe Bifurcation and NVMe RAID in Linux Part 2: Benchmarks and Encryption

📅 April 10, 2023
“How fast is it?”

With the hardware configured, installed, and running, it is time to run a few benchmarks using the Disks benchmarking utility and KDiskMark to get an idea of the maximum synthetic speeds possible with our new arrangement.

Will NVMe RAID utilizing PCIe bifurcation achieve worthwhile results or will this be underwhelming?

mdadm: How to Remove a Drive From a RAID Array

📅 December 22, 2020
What? Why is this drive still insisting that it is a part of a RAID array?

If you use mdadm, you might have encountered a situation where, even though you entered the correct commands to fail a member drive and remove it from the array, another computer or the same computer still recognizes it as a part of the old array.

This is normal because mdadm member drives contain superblocks that contain RAID information. If a computer still sees a removed drive as part of a RAID array, it is usually because the superblock was not removed from the drive.

Here is how to do that.

MD127? How to Rename a RAID Array with mdadm

📅 July 26, 2019
“What? My RAID array device is named /dev/md127? How do I change it to /dev/md2?”

If you have used software RAID on Linux with mdadm, then you will have probably have noticed that a second RAID array created will often receive the device name /dev/md127 instead of something more logical like /dev/md1 or /dev/md2 for consistency.

This article shows how to change the default /dev/md127 into /dev/md2 (or whatever you prefer) for a name that makes better sense.