Setup raid 1 debian

In this guide, we will go over a number of different RAID configurations that can be set up using a Debian 9 server. Before we begin, we need to install mdadm , the tool that allows us to set up and manage software RAID arrays in Linux.

Update the local package cache to retrieve an up-to-date list of available packages and then download and install the package:. This will install mdadm and all of its dependencies. Verify that the utility is installed by typing:. The application version should be displayed, indicating that mdadm is installed and ready to use. Throughout this guide, we will be introducing the steps to create a number of different RAID levels.

If you wish to follow along, you will likely want to reuse your storage devices after each section. This section can be referenced to learn how to quickly reset your component storage devices prior to testing a new RAID level. Skip this section for now if you have not yet set up any arrays. Warning: This process will completely destroy the array and any data written to it.

Make sure that you are operating on the correct array and that you have copied off any data you need to retain prior to destroying the array. Check them every time to make sure you are operating on the correct devices. After discovering the devices used to create an array, zero their superblock to remove the RAID metadata and reset them to normal:.

You should remove any of the persistent references to the array. Finally, update the initramfs again so that the early boot process does not try to bring an unavailable array online. At this point, you should be ready to reuse the storage devices individually, or as components of a different array.

The RAID 0 array works by breaking up data into chunks and striping it across the available disks. This means that each disk contains a portion of the data and that multiple disks will be referenced when retrieving information. As you can see above, we have two disks without a filesystem, each G in size. These will be the raw components we will use to build the array. To create a RAID 0 array with these components, pass them in to the mdadm --create command.

You can automatically scan the active array and append the file by typing:. Afterwards, you can update the initramfs, or initial RAM file system, so that the array will be available during the early boot process:. The RAID 1 array type is implemented by mirroring data across all available disks. The easiest way is to enable the checks that are built into the Debian package:. These checks, performed by the hard disk controllers directly, could warn you of imminent failures ahead of time.

Hello, thanks for this entry. I too run raid1 on all my Debian systems so I'll add comments from my experience: If you don't set the metadata to 0. All my systems run with 1. Easier to use than the array's UUID. Great how to! Thanks for the help! I was having a bear of a time getting step 5 to work. Turned out that step 4 was doing nothing raid related for me. Which I solved with the following 2 steps.

And I can add that, its also possible to make mdadm daemon send email about any fails if the happens. A nice warning system.

As you see from the above screen, that there is no any super-block detected yet, means no RAID defined. To auto-mount RAID1 on system reboot, you need to make an entry in fstab file. Our main purpose is, even after any of hard disk fail or crash our data needs to be available. Now let us see what will happen when a disk plugged out removed sdc disk or fails. Now in the above image, you can see that one of our drive is lost.

I unplugged one of the drive from my Virtual machine. Now let us check our precious data. Did you see our data is still available.

From this we come to know the advantage of RAID 1 mirror. TecMint is the fastest growing and most trusted community site for any kind of Linux Articles, Guides and Books on the web.

Millions of people visit TecMint! If you like what you are reading, please consider buying us a coffee or 2 as a token of appreciation. We are thankful for your never ending support. I followed your directions. For some reason, it changed md0 to md Close Menu Friends. Follow me on Twitter Follow me on GitHub. Step 1 Perform normal installation process up to the disk partitioning menu. Step 2 Select manual partitioning method in the disk partitioning menu. Step 4 Create partitions on the first disk.