zfspace 0.5.1

zfspace tool helps to analyze how zfs disk space is used

zfspace

Console tool to find occupied pool space in ZFS on Linux. The tool uses pure python3 with shell commands to collect useful information from ZFS and show in convenient way.

Introduction

ZFS is a non-trivial LVS filesystem with snapshots, reservations, deduplication, filesystems hierarchy and so on. Common tools, such as dh or ls can't provide relevant information when you need to free some space. There is an explanatory article about this.
Snapshots USED space is another puzzle. ZFS only shows space freed by destroying individual snapshot or space occupied by all filesystem snapshots. If you add up all USED space by the snapshots, you will not get total occupied space because there is some space occupied by a snapshot combinations. Most people do not comprehend this.
zfspace tries to analyse space usage and describe it in a human way with recommendations on the things you can do to free some space. The snapshot analysis is similar to this tool.

Installation

pip3 install zfspace zfspace doesn't require root priviledges as it is installed in ~/.local/bin/

Usage

Usage: zfspace [-h] [-V] [-f FILTER] dataset_name
Run zfspace -h to get more help
Example: zfspace mypool/root/

Compatibility

zfspace is pure python module installed by pip, so it might work on any Linux with Python3 and pip package manager. But zfspace has only been tested on Ubuntu 18.04 and Debian 10.