Creating Bootable RAID Drives with Rocky Linux using mdadm on an HP DL360 Gen6

Creating Bootable RAID Drives with Rocky Linux on HP DL360 Gen6

In this article, we will cover the process of creating bootable RAID drives using Rocky Linux and the mdadm tool on an HP DL360 Gen6 server. This guide is intended for users who are familiar with Linux and server administration. We will also discuss key concepts related to RAID, mdadm, and the steps required for configuring and setting up a bootable RAID array.

What is RAID?

RAID (Redundant Array of Independent Disks) is a technology used to combine multiple physical hard drives into a single logical unit. RAID arrays provide increased data reliability and performance by using various techniques such as striping, mirroring, and parity calculations. There are several RAID levels, each with its unique benefits and trade-offs.

Rocky Linux and mdadm

Rocky Linux is a free and open-source operating system based on Red Hat Enterprise Linux (RHEL). It is a stable, secure, and flexible platform for servers and workstations. The mdadm tool is a popular choice for creating and managing RAID arrays in Linux systems.

Setting up the HP DL360 Gen6 Server

To begin, ensure that your HP DL360 Gen6 server is properly cabled and connected to a power source. Install the four hard drives you intend to use in the server. Next, boot the server using a Rocky Linux installation media, such as a DVD or USB drive.

Creating a RAID Array using mdadm

Once you have booted into the Rocky Linux installation environment, you can start setting up your RAID array. First, you need to identify the drives you will use for the array. You can use the following command to list all available drives:

Take note of the drives you intend to use, for example, /dev/sda, /dev/sdb, /dev/sdc, and /dev/sdd.

To create a RAID 1 array (mirroring), use the following command:

Replace /dev/md0 with the desired name for your RAID array, /dev/sda and /dev/sdb with the drives you want to use for the array, and 2 for the number of active devices. The --metadata=1.2 option specifies the layout and chunk size for the array.

To add the remaining two drives to the array, use the following command:

This will increase the number of active devices in the RAID array from 2 to 4. You can monitor the progress of the array using the following command:

Configuring the Boot Loader

Once the RAID array is set up, you can configure the boot loader to load the operating system from the array. To do this, you need to install the grub boot loader on the RAID array. Use the following command:

This will install the grub boot loader on the first sector of the RAID array. Next, you need to configure the grub boot