Apologies if this has been answered somewhere, I've searched everywhere and couldn't find anything.
I'm a PhD student and I manage a small cluster for our group. When installing Ubuntu 20.04 on our servers we chose the "experimental" zfs feature. We've run into a few issues over the last two years and we never used ZFS to our advantage. We upgraded to Ubuntu 22.04 we'd like to uninstall it now - but can we?
When I run zpool list I see bpool and rpool - so if I uninstalled the packages (not suer which ones since I didn't explicitly install them), would the system even boot? Clearly I don't know much about ZFS and shouldn't have installed it..
Obviously I would really like to avoid re-installing everything because it takes a really long time and things generally break. Thanks in advance!
Edit: Here's the requested output (although it sounds like I'm SOL).
$ sudo df -h
Filesystem Size Used Avail Use% Mounted on
tmpfs 6.3G 2.9M 6.3G 1% /run
rpool/ROOT/ubuntu_3tmtm1 830G 25G 805G 3% /
tmpfs 32G 16K 32G 1% /dev/shm
tmpfs 5.0M 0 5.0M 0% /run/lock
rpool/ROOT/ubuntu_3tmtm1/var/www 805G 128K 805G 1% /var/www
rpool/ROOT/ubuntu_3tmtm1/var/snap 805G 3.9M 805G 1% /var/snap
rpool/ROOT/ubuntu_3tmtm1/var/games 805G 128K 805G 1% /var/games
rpool/ROOT/ubuntu_3tmtm1/srv 805G 128K 805G 1% /srv
rpool/ROOT/ubuntu_3tmtm1/usr/local 841G 36G 805G 5% /usr/local
rpool/ROOT/ubuntu_3tmtm1/var/spool 805G 256K 805G 1% /var/spool
rpool/ROOT/ubuntu_3tmtm1/var/lib 809G 4.1G 805G 1% /var/lib
rpool/ROOT/ubuntu_3tmtm1/var/mail 805G 128K 805G 1% /var/mail
rpool/ROOT/ubuntu_3tmtm1/var/log 805G 154M 805G 1% /var/log
rpool/ROOT/ubuntu_3tmtm1/var/lib/NetworkManager 805G 256K 805G 1% /var/lib/NetworkManager
rpool/ROOT/ubuntu_3tmtm1/var/lib/AccountsService 805G 128K 805G 1% /var/lib/AccountsService
rpool/ROOT/ubuntu_3tmtm1/var/lib/apt 806G 522M 805G 1% /var/lib/apt
rpool/ROOT/ubuntu_3tmtm1/var/lib/dpkg 805G 76M 805G 1% /var/lib/dpkg
bpool/BOOT/ubuntu_3tmtm1 1.8G 253M 1.6G 15% /boot
/dev/sda1 511M 7.1M 504M 2% /boot/efi
169.237.79.48:/mnt/home 8.0T 1.7T 6.3T 22% /home
169.237.79.48:/mnt/data 11T 7.8T 3.0T 73% /data
169.237.79.48:/mnt/backup 12T 28G 12T 1% /backup
169.237.79.48:/mnt/nvme 5.1T 3.8T 1.4T 74% /nvme
$ sudo df -hT
Filesystem Type Size Used Avail Use% Mounted on
tmpfs tmpfs 6.3G 2.9M 6.3G 1% /run
rpool/ROOT/ubuntu_3tmtm1 zfs 830G 25G 805G 3% /
tmpfs tmpfs 32G 16K 32G 1% /dev/shm
tmpfs tmpfs 5.0M 0 5.0M 0% /run/lock
rpool/ROOT/ubuntu_3tmtm1/var/www zfs 805G 128K 805G 1% /var/www
rpool/ROOT/ubuntu_3tmtm1/var/snap zfs 805G 3.9M 805G 1% /var/snap
rpool/ROOT/ubuntu_3tmtm1/var/games zfs 805G 128K 805G 1% /var/games
rpool/ROOT/ubuntu_3tmtm1/srv zfs 805G 128K 805G 1% /srv
rpool/ROOT/ubuntu_3tmtm1/usr/local zfs 841G 36G 805G 5% /usr/local
rpool/ROOT/ubuntu_3tmtm1/var/spool zfs 805G 256K 805G 1% /var/spool
rpool/ROOT/ubuntu_3tmtm1/var/lib zfs 809G 4.1G 805G 1% /var/lib
rpool/ROOT/ubuntu_3tmtm1/var/mail zfs 805G 128K 805G 1% /var/mail
rpool/ROOT/ubuntu_3tmtm1/var/log zfs 805G 154M 805G 1% /var/log
rpool/ROOT/ubuntu_3tmtm1/var/lib/NetworkManager zfs 805G 256K 805G 1% /var/lib/NetworkManager
rpool/ROOT/ubuntu_3tmtm1/var/lib/AccountsService zfs 805G 128K 805G 1% /var/lib/AccountsService
rpool/ROOT/ubuntu_3tmtm1/var/lib/apt zfs 806G 522M 805G 1% /var/lib/apt
rpool/ROOT/ubuntu_3tmtm1/var/lib/dpkg zfs 805G 76M 805G 1% /var/lib/dpkg
bpool/BOOT/ubuntu_3tmtm1 zfs 1.8G 253M 1.6G 15% /boot
/dev/sda1 vfat 511M 7.1M 504M 2% /boot/efi
169.237.79.48:/mnt/home nfs 8.0T 1.7T 6.3T 22% /home
169.237.79.48:/mnt/data nfs 11T 7.8T 3.0T 73% /data
169.237.79.48:/mnt/backup nfs 12T 28G 12T 1% /backup
169.237.79.48:/mnt/nvme nfs 5.1T 3.8T 1.4T 74% /nvme
$ sudo lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINTS
loop0 7:0 0 4K 1 loop /snap/bare/5
loop1 7:1 0 55.6M 1 loop /snap/core18/2714
loop2 7:2 0 55.6M 1 loop /snap/core18/2721
loop3 7:3 0 73M 1 loop /snap/core22/607
loop4 7:4 0 63.3M 1 loop /snap/core20/1828
loop5 7:5 0 349.7M 1 loop /snap/gnome-3-38-2004/137
loop6 7:6 0 346.3M 1 loop /snap/gnome-3-38-2004/119
loop7 7:7 0 63.3M 1 loop /snap/core20/1852
loop8 7:8 0 460.4M 1 loop /snap/gnome-42-2204/68
loop9 7:9 0 53.2M 1 loop /snap/snapd/18933
loop10 7:10 0 81.3M 1 loop /snap/gtk-common-themes/1534
loop11 7:11 0 45.9M 1 loop /snap/snap-store/638
loop12 7:12 0 45.9M 1 loop /snap/snap-store/599
loop13 7:13 0 91.7M 1 loop /snap/gtk-common-themes/1535
loop14 7:14 0 49.8M 1 loop /snap/snapd/18596
loop16 7:16 0 428K 1 loop /snap/snapd-desktop-integration/57
loop17 7:17 0 241.9M 1 loop /snap/firefox/2559
loop18 7:18 0 460.6M 1 loop /snap/gnome-42-2204/87
loop19 7:19 0 241.9M 1 loop /snap/firefox/2579
sda 8:0 0 931.5G 0 disk
├─sda1 8:1 0 512M 0 part /boot/grub
│ /boot/efi
├─sda2 8:2 0 1K 0 part
├─sda5 8:5 0 2G 0 part [SWAP]
├─sda6 8:6 0 2G 0 part
└─sda7 8:7 0 927G 0 part
$ sudo zpool status
pool: bpool
state: ONLINE
scan: scrub repaired 0B in 00:00:03 with 0 errors on Sun Apr 9 00:24:04 2023
config:
NAME STATE READ WRITE CKSUM
bpool ONLINE 0 0 0
214bb022-06 ONLINE 0 0 0
errors: No known data errors
pool: rpool
state: ONLINE
status: Some supported and requested features are not enabled on the pool.
The pool can still be used, but some features are unavailable.
action: Enable all features using 'zpool upgrade'. Once this is done,
the pool may no longer be accessible by software that does not support
the features. See zpool-features(7) for details.
scan: scrub repaired 0B in 00:29:07 with 0 errors on Sun Apr 9 00:53:13 2023
config:
NAME STATE READ WRITE CKSUM
rpool ONLINE 0 0 0
214bb022-07 ONLINE 0 0 0
errors: No known data errors
