Creating a NAS Using a Raspberry Pi 3 Part 1

Find yourself needing a lot of storage on your network and do not want to have something that requires a lot of attention? You can use a Raspberry Pi 3 and a hard drive enclosure to make a home or small office NAS to store files and keep them available.

Recently I found myself wanting to upgrade my home network attached storage (NAS). It was basically an old laptop connected to a USB enclosure. It was stable, but had a few flaws. The first was that I had to periodically clean out the laptop since it seemed to be a magnet for dust. The second was that the hard drive was a single drive that I kept backed up, but it did not provide availability in case that drive should fail. Plus, the laptop drew more power than it needed to since it spent a lot of time just sitting around.

What I wanted was something that used a small amount of power and was expandable. I wanted to be able to easily add more drives in as our family storage needs grew. My ideal solution would not need much fuss or maintenance. Most importantly, since I am cheap, the hardware solution needed to be low cost.

I had been waiting to pick up a Raspberry Pi 3 until I had a project that actually needed one. If you search Google, you will find a lot of people using it for a file server. Owners also complain because not only does it just come with USB 2.0 ports, but the built-in Ethernet also shares bandwidth with the USB devices. However, I was not looking for something high-bandwidth as all the video I transfer over the network is already compressed. My home network is limited to 100 megabit Ethernet, so at best I only get around eight to nine megabytes a second transfer speed anyway. I ordered the Vilros Raspberry Pi 3 Basic Starter Kit off Amazon and picked up a 64 gigabyte class-10 SD card for the root file system.

Once I settled on the Pi 3, I needed an external USB enclosure. I ended up picking the Mediasonic ProBox HF2-SU3S2 four-bay enclosure. It has a standard-sized cooling fan in the back and controls on the front for things like setting the fan speed and so on. I had two four gigabyte drives ready for it and would still have room to expand.

While waiting for everything to arrive, I then had to decide the how of setting the NAS up. There a lot of options out there, ranging from FreeNAS to rolling your own Linux distribution. You will see a huge amount of discussion of what types of file systems to use. Here it seems to be split into two camps: the “ZFS for everything” camp, and everything else (XFS, EXT4, and so on). ZFS is a great file system and I have used it for other things, but for a home NAS (especially one running off a Pi), it can be a bit of overkill. This is especially true since many of ZFS’s best features require a lot of RAM.

What I decided on is good old Linux software RAID 1 and the XFS file system. I have had a lot of success with software RAID over the years, and for my purposes it has been more flexible than a hardware RAID system. Linux software RAID can do things like convert in-place from a RAID-1 setup to RAID-5 with no data loss. This way, if I needed to expand past the four gigabyte RAID-1 system, I could add another drive and convert it to RAID-5. Linux software RAID-5 will let you grow it by adding hard drives, so in the end I could have a twelve gigabyte RAID-5 system if I needed one. I already back up the data with integrity checks, so instead of ZFS, XFS would satisfy all of my needs.

Distribution-wise, I decided it would be either Raspbian or Ubuntu MATE. Both are Debian-based, and both are solid operating systems for the Pi. Raspbian is the official distribution from the Raspberry Pi Foundation, and MATE is a distribution for the Pi built by Martin Wimpress and Rohith Madhavan. As I had never used a Pi before, I had no idea how either would work on the Pi 3. I used to use MATE for my desktop so I was at least familiar with it and knew it did not need a lot of resources to run.

In Part 2 I will go over setting up the Pi 3 to serve out data. As a spoiler, I will also go into why I chose Ubuntu for my Pi 3 in the end over Raspbian.


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