Setup a ZFS storage pool

1. Overview

ZFS is a combined file system and logical volume manager originally designed and implemented by a team at Sun Microsystems led by Jeff Bonwick and Matthew Ahrens. Features of ZFS include protection against data corruption, high storage capacity (256 ZiB), snapshots and copy-on-write clones and continuous integrity checking to name but a few. If you are dealing with large amounts of data, or providing a backing filesystem for virtualisation, ZFS is a great choice.

This guide will go through the process of installing ZFS on Ubuntu 16.04 LTS and setting up a storage pool.

What you’ll learn

  • How to install ZFS
  • How to create a storage pool

What you’ll need

  • Ubuntu Server 16.04 LTS

Ready? Let’s head over to the next step!

2. Installing ZFS

The main components of ZFS are maintained as a standard Ubuntu package, so to install simply run:

sudo apt install zfsutils-linux

After that, we can check if ZFS was installed correctly by running:

whereis zfs

You should see output similar to the following:

whereisoutput

Now that we’re done installing the required packages, let’s create a storage pool!

3. Creating a ZFS Pool

Choosing Drives to Pool

Check installed drives by running:

sudo fdisk -l

Carefully note down the device names of drives you want to pool.

These are the two drives we’re going to pool:

disk1

Creating a Pool

There are two types of simple storage pools we can create. A striped pool, where a copy of data is stored across all drives or a mirrored pool, where a single complete copy of data is stored on all drives.

To create a striped pool, we run:

sudo zpool create new-pool /dev/sdb /dev/sdc

To create a mirrored pool, we run:

sudo zpool create new-pool mirror /dev/sdb /dev/sdc

In both examples, new-pool is the name of the pool.

Sometimes an error like this might pop up:


error

Add “-f” to the end of the zpool create command to override it.

A mirrored pool is usually recommended as we’d still be able to access our data if a single drive fails. However, this means that we’ll only get the capacity of a single drive. A striped pool, while giving us the combined storage of all drives, is rarely recommended as we’ll lose all our data if a drive fails. You can also opt for both, or change the designation at a later date if you add more drives to the pool.

The newly created pool is mounted at /new-pool. You can select a different mount point using the -m option:

sudo zpool create -m /usr/share/pool new-pool mirror /dev/sdb /dev/sdc

The newly mounted pool will appear to Ubuntu as any other part of the filesystem.

4. Checking Pool Status

You can check the status of ZFS pools with:

sudo zpool status

This is the status of our newly created pool:

newpoolstats


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