Accessing Data on a Software RAID-1 NVMe SSD/HDD Configuration in Ubuntu 22.04.4 LTS
This article focuses on accessing data on a software RAID-1 configuration using NVMe SSD and HDD on a Linux server running Ubuntu 22.04.4 LTS. We will cover the key concepts, subtitles, and detailed context of the topic, including code blocks as needed.
Understanding Software RAID-1
RAID (Redundant Array of Independent Disks) is a technique used to combine multiple physical disks into a single logical unit to improve performance, reliability, or both. Software RAID-1 is a type of RAID that uses the operating system's software to manage the RAID array.
RAID-1 is a mirroring technique that duplicates data across two or more disks. This provides redundancy, so if one disk fails, the data is still available on the other disk. In this configuration, we will use two disks, one NVMe SSD and one HDD, in a software RAID-1 array.
Setting up the RAID-1 Array
To set up the RAID-1 array, you will need to partition the disks and create the array using the mdadm tool. Here is an example of how to create a RAID-1 array:
sudo mdadm --create /dev/md0 --level=1 --raid-devices=2 /dev/nvme0n1 /dev/sda1
In this example, /dev/nvme0n1 is the NVMe SSD and /dev/sda1 is the HDD. The resulting RAID array will be accessible at /dev/md0.
Formatting the RAID Array
Once the RAID array is created, you will need to format it with a file system. In this example, we will use the EXT3 file system:
sudo mkfs.ext3 /dev/md0
Mounting the RAID Array
Finally, you will need to mount the RAID array to a directory so that it can be accessed. You can do this manually, or you can add an entry to the /etc/fstab file to mount it automatically at boot time.
Here is an example of how to mount the RAID array manually:
sudo mkdir /mnt/raid1
sudo mount /dev/md0 /mnt/raid1
Accessing Data on the RAID Array
Once the RAID array is mounted, you can access the data on it like you would with any other directory. For example, you can create, modify, and delete files and directories:
touch /mnt/raid1/test.txt
echo "Hello, world!" > /mnt/raid1/test.txt
cat /mnt/raid1/test.txt
rm /mnt/raid1/test.txt
- Software RAID-1 is a technique for duplicating data across two or more disks for redundancy.
- To set up a RAID-1 array, you will need to partition the disks and create the array using the
mdadmtool. - Once the RAID array is created, you will need to format it with a file system and mount it to a directory.
- You can access the data on the RAID array like you would with any other directory.
References
This article was generated based on the following question:
I have a Linux server (Ubuntu 22.04.4 LTS) with an M.2 NVMe SSD and four TB NAS HDDs in a software-based RAID-1 configuration (Linux RAID-1 formatted EXT3 partition). How do I access the data on this RAID array?