ZFS - Notes
Contents
Check ZFS compression
Use all to get all properties.
zfs get compressratio <path>
luke@luke-IdeaPad5:~$ zfs get compressratio /var/log
NAME PROPERTY VALUE SOURCE
rpool/ROOT/ubuntu_xhbyc5/var/log compressratio 4.97x -
compression ratio
4.97x in the above means that I am storing 4.97 times as much data as disk space.
zfs get used,compressratio,compression,logicalused mypool/compressed_dataset
NAME PROPERTY VALUE SOURCE
mypool/compressed_dataset used 449G -
mypool/compressed_dataset compressratio 1.11x -
mypool/compressed_dataset compression lz4 local
mypool/compressed_dataset logicalused 496G -
The dataset is currently using 449 GB of space (the used property). Without compression, it would have taken 496 GB of space (the logicalused property). This results in the 1.11:1 compression ratio. from: https://docs.freebsd.org/en/books/handbook/zfs/
ZFS Create Snapshot
zfs snap pool@snapname
zfs get info
zfs get all <path>
List snapshots by creation date
zfs list -t snapshot -o name,creation -s creation
NAME CREATION
rpool/USERDATA/luke_74j3lx@autozsys_g6z0oq Tue Aug 17 19:31 2021
bpool/BOOT/ubuntu_xhbyc5@autozsys_um49y5 Tue Aug 17 19:35 2021
bpool/BOOT/ubuntu_xhbyc5@autozsys_a0dakj Tue Aug 17 19:35 2021
rpool/ROOT/ubuntu_xhbyc5@autozsys_um49y5 Tue Aug 17 19:35 2021
rpool/ROOT/ubuntu_xhbyc5@autozsys_a0dakj Tue Aug 17 19:35 2021
rpool/ROOT/ubuntu_xhbyc5/srv@autozsys_um49y5 Tue Aug 17 19:35 2021
rpool/ROOT/ubuntu_xhbyc5/srv@autozsys_a0dakj Tue Aug 17 19:35 2021
rpool/ROOT/ubuntu_xhbyc5/usr@autozsys_um49y5 Tue Aug 17 19:35 2021
rpool/ROOT/ubuntu_xhbyc5/usr@autozsys_a0dakj Tue Aug 17 19:35 2021
rpool/ROOT/ubuntu_xhbyc5/usr/local@autozsys_um49y5 Tue Aug 17 19:35 2021
rpool/ROOT/ubuntu_xhbyc5/usr/local@autozsys_a0dakj Tue Aug 17 19:35 2021
rpool/ROOT/ubuntu_xhbyc5/var@autozsys_um49y5 Tue Aug 17 19:35 2021
rpool/ROOT/ubuntu_xhbyc5/var@autozsys_a0dakj Tue Aug 17 19:35 2021
rpool/ROOT/ubuntu_xhbyc5/var/games@autozsys_um49y5 Tue Aug 17 19:35 2021
rpool/ROOT/ubuntu_xhbyc5/var/games@autozsys_a0dakj Tue Aug 17 19:35 2021
rpool/ROOT/ubuntu_xhbyc5/var/lib@autozsys_um49y5 Tue Aug 17 19:35 2021
rpool/ROOT/ubuntu_xhbyc5/var/lib@autozsys_a0dakj Tue Aug 17 19:35 2021
rpool/ROOT/ubuntu_xhbyc5/var/lib/AccountsService@autozsys_um49y5 Tue Aug 17 19:35 2021
rpool/ROOT/ubuntu_xhbyc5/var/lib/AccountsService@autozsys_a0dakj Tue Aug 17 19:35 2021
rpool/ROOT/ubuntu_xhbyc5/var/lib/NetworkManager@autozsys_um49y5 Tue Aug 17 19:35 2021
rpool/ROOT/ubuntu_xhbyc5/var/lib/NetworkManager@autozsys_a0dakj Tue Aug 17 19:35 2021
List filesystems showing creation date
luke@luke-IdeaPad5:~$ zfs list -t filesystem -o name,used,mountpoint,creation
NAME USED MOUNTPOINT CREATION
bpool 558M /boot Tue Aug 17 19:24 2021
bpool/BOOT 556M none Tue Aug 17 19:24 2021
bpool/BOOT/ubuntu_xhbyc5 556M /boot Tue Aug 17 19:24 2021
rpool 23.7G / Tue Aug 17 19:24 2021
rpool/ROOT 12.3G none Tue Aug 17 19:24 2021
rpool/ROOT/ubuntu_xhbyc5 12.3G / Tue Aug 17 19:24 2021
rpool/ROOT/ubuntu_xhbyc5/srv 192K /srv Tue Aug 17 19:24 2021
rpool/ROOT/ubuntu_xhbyc5/usr 900K /usr Tue Aug 17 19:24 2021
rpool/ROOT/ubuntu_xhbyc5/usr/local 708K /usr/local Tue Aug 17 19:24 2021
rpool/ROOT/ubuntu_xhbyc5/var 3.30G /var Tue Aug 17 19:24 2021
rpool/ROOT/ubuntu_xhbyc5/var/games 192K /var/games Tue Aug 17 19:24 2021
rpool/ROOT/ubuntu_xhbyc5/var/lib 3.15G /var/lib Tue Aug 17 19:24 2021
rpool/ROOT/ubuntu_xhbyc5/var/lib/AccountsService 1.35M /var/lib/AccountsService Tue Aug 17 19:24 2021
rpool/ROOT/ubuntu_xhbyc5/var/lib/NetworkManager 5.86M /var/lib/NetworkManager Tue Aug 17 19:24 2021
rpool/ROOT/ubuntu_xhbyc5/var/lib/apt 104M /var/lib/apt Tue Aug 17 19:24 2021
rpool/ROOT/ubuntu_xhbyc5/var/lib/dpkg 194M /var/lib/dpkg Tue Aug 17 19:24 2021
rpool/ROOT/ubuntu_xhbyc5/var/log 151M /var/log Tue Aug 17 19:24 2021
rpool/ROOT/ubuntu_xhbyc5/var/mail 192K /var/mail Tue Aug 17 19:24 2021
rpool/ROOT/ubuntu_xhbyc5/var/snap 4.82M /var/snap Tue Aug 17 19:24 2021
rpool/ROOT/ubuntu_xhbyc5/var/spool 2.21M /var/spool Tue Aug 17 19:24 2021
rpool/ROOT/ubuntu_xhbyc5/var/www 192K /var/www Tue Aug 17 19:24 2021
rpool/USERDATA 10.8G / Tue Aug 17 19:24 2021
rpool/USERDATA/luke_74j3lx 10.8G /home/luke Tue Aug 17 19:26 2021
rpool/USERDATA/root_74j3lx 1.86M /root Tue Aug 17 19:26 2021
Sort by used space
zfs list -t filesystem -o name,used,mountpoint,creation -s used
luke@luke-IdeaPad5:~$ zfs list -t filesystem -o name,used,mountpoint,creation -s used
NAME USED MOUNTPOINT CREATION
rpool/ROOT/ubuntu_xhbyc5/srv 192K /srv Tue Aug 17 19:24 2021
rpool/ROOT/ubuntu_xhbyc5/var/games 192K /var/games Tue Aug 17 19:24 2021
rpool/ROOT/ubuntu_xhbyc5/var/mail 192K /var/mail Tue Aug 17 19:24 2021
rpool/ROOT/ubuntu_xhbyc5/var/www 192K /var/www Tue Aug 17 19:24 2021
rpool/ROOT/ubuntu_xhbyc5/usr/local 708K /usr/local Tue Aug 17 19:24 2021
rpool/ROOT/ubuntu_xhbyc5/usr 900K /usr Tue Aug 17 19:24 2021
rpool/ROOT/ubuntu_xhbyc5/var/lib/AccountsService 1.35M /var/lib/AccountsService Tue Aug 17 19:24 2021
rpool/USERDATA/root_74j3lx 1.86M /root Tue Aug 17 19:26 2021
rpool/ROOT/ubuntu_xhbyc5/var/spool 2.21M /var/spool Tue Aug 17 19:24 2021
rpool/ROOT/ubuntu_xhbyc5/var/snap 4.82M /var/snap Tue Aug 17 19:24 2021
rpool/ROOT/ubuntu_xhbyc5/var/lib/NetworkManager 5.86M /var/lib/NetworkManager Tue Aug 17 19:24 2021
rpool/ROOT/ubuntu_xhbyc5/var/lib/apt 104M /var/lib/apt Tue Aug 17 19:24 2021
rpool/ROOT/ubuntu_xhbyc5/var/log 151M /var/log Tue Aug 17 19:24 2021
rpool/ROOT/ubuntu_xhbyc5/var/lib/dpkg 194M /var/lib/dpkg Tue Aug 17 19:24 2021
bpool/BOOT/ubuntu_xhbyc5 556M /boot Tue Aug 17 19:24 2021
bpool/BOOT 556M none Tue Aug 17 19:24 2021
bpool 558M /boot Tue Aug 17 19:24 2021
rpool/ROOT/ubuntu_xhbyc5/var/lib 3.15G /var/lib Tue Aug 17 19:24 2021
rpool/ROOT/ubuntu_xhbyc5/var 3.30G /var Tue Aug 17 19:24 2021
rpool/USERDATA/luke_74j3lx 10.8G /home/luke Tue Aug 17 19:26 2021
rpool/USERDATA 10.8G / Tue Aug 17 19:24 2021
rpool/ROOT/ubuntu_xhbyc5 12.3G / Tue Aug 17 19:24 2021
rpool/ROOT 12.3G none Tue Aug 17 19:24 2021
rpool 23.7G / Tue Aug 17 19:24 2021
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Thanks!
Luke