I want to switch my data disk from the NTFS file system to ZFS when I replace it. I use Ubuntu 22.04.1 LTS installed in ZFS on an M4-CT256M4SSD2 256 GB SSD (I selected ZFS during installation). The new storage drive, which is the subject of this question, is a WDC WD100EFAX-68LHPN0 10TB. Other disks and peripherals have been unplugged.
The installation of the ZFS tools went well. Creating the ZFS partition also worked fine.
The problem is that I am unable to use this disk. It is impossible to mount this partition, neither by the GNOME Disks graphical tool, which always returns an error, nor using the mount command:
# mount -t zfs /dev/sdb1 /media/DOCUMENTS
filesystem 'dev/sdb1' cannot be mounted, unable to open the dataset
The DOCUMENTS partition does not appear under Dolphin, but it is clearly visible under GNOME Files. However, it is impossible to access it, as are the two system disk partitions, bpool and rpool.
Thanks for your help, best regards.
Additional information following Bardo's first response.
I created the ZFS partition the easiest way, following several tutorials that all advised the same thing:
Install the ZFS application and verifying its installation:
sudo apt update
sudo apt install zfsutils-linux
Check the ZFS version after installation:
$ sudo zfs version
zfs-2.1.4-0ubuntu0.1
zfs-kmod-2.1.4-0ubuntu0.1
Check the ZFS file storage directories using the whereis command:
$ sudo whereis zfs
zfs: /usr/sbin/zfs /etc/zfs /usr/share/zfs /usr/share/man/man8/zfs.8.gz /usr/share/man/man4/zfs.4.gz
Create the ZFS partition:
sudo zpool create -f DOCUMENTS /dev/sdb
List ZFS partitions:
$ sudo zpool list
NAME SIZE ALLOC FREE CKPOINT EXPANDSZ FRAG CAP DEDUP HEALTH ALTROOT
DOCUMENTS 9.09T 396K 9.09T - - 0% 0% 1.00x ONLINE -
Check the status of the ZFS partition (pool):
$ sudo zpool status
pool: DOCUMENTS
state: ONLINE
config: NAME STATE READ WRITE CKSUM
DOCUMENTS ONLINE 0 0 0
sda ONLINE 0 0 0
errors: No known data errors
So far, the procedure for creating the ZFS partition has gone well. But contrary to what the tutorials I have read and reread claim, the partition does not get mounted automatically when it is created and the disk is unusable. It is invisible under Dolphin and does not get mounted under GNOME Files.
Where did I make a mistake?
@ Artur Meinild.
I did not create a "dataset" on the Zpool. My whole procedure is above.
root@UBU2204:/# zfs list
NAME USED AVAIL REFER MOUNTPOINT
DOCUMENTS 360K 8.97T 96K /DOCUMENTS
bpool 249M 1.51G 96K /boot
bpool/BOOT 248M 1.51G 96K none
bpool/BOOT/ubuntu_7yn8t5 248M 1.51G 248M /boot
rpool 9.75G 215G 96K /
rpool/ROOT 8.45G 215G 96K none
rpool/ROOT/ubuntu_7yn8t5 8.45G 215G 4.71G /
rpool/ROOT/ubuntu_7yn8t5/srv 96K 215G 96K /srv
rpool/ROOT/ubuntu_7yn8t5/usr 232K 215G 96K /usr
rpool/ROOT/ubuntu_7yn8t5/usr/local 136K 215G 136K /usr/local
rpool/ROOT/ubuntu_7yn8t5/var 3.74G 215G 96K /var
rpool/ROOT/ubuntu_7yn8t5/var/games 96K 215G 96K /var/games
rpool/ROOT/ubuntu_7yn8t5/var/lib 3.34G 215G 3.19G /var/lib
rpool/ROOT/ubuntu_7yn8t5/var/lib/AccountsService 108K 215G 108K /var/lib/AccountsService
rpool/ROOT/ubuntu_7yn8t5/var/lib/NetworkManager 140K 215G 140K /var/lib/NetworkManager
rpool/ROOT/ubuntu_7yn8t5/var/lib/apt 104M 215G 104M /var/lib/apt
rpool/ROOT/ubuntu_7yn8t5/var/lib/dpkg 43.8M 215G 43.8M /var/lib/dpkg
rpool/ROOT/ubuntu_7yn8t5/var/log 414M 215G 414M /var/log
rpool/ROOT/ubuntu_7yn8t5/var/mail 96K 215G 96K /var/mail
rpool/ROOT/ubuntu_7yn8t5/var/snap 3.09M 215G 3.09M /var/snap
rpool/ROOT/ubuntu_7yn8t5/var/spool 112K 215G 112K /var/spool
rpool/ROOT/ubuntu_7yn8t5/var/www 96K 215G 96K /var/www
rpool/USERDATA 1.25G 215G 96K /
rpool/USERDATA/hyacinthe_nurhv0 1.25G 215G 1.25G /home/hyacinthe
rpool/USERDATA/root_nurhv0 140K 215G 140K /root
root@UBU2204:/#
root@UBU2204:/# zfs get all | grep mountpoint
DOCUMENTS mountpoint /DOCUMENTS default
bpool mountpoint /boot local
bpool/BOOT mountpoint none local
bpool/BOOT/ubuntu_7yn8t5 mountpoint /boot local
rpool mountpoint / local
rpool/ROOT mountpoint none local
rpool/ROOT/ubuntu_7yn8t5 mountpoint / local
rpool/ROOT/ubuntu_7yn8t5/srv mountpoint /srv inherited from rpool/ROOT/ubuntu_7yn8t5
rpool/ROOT/ubuntu_7yn8t5/usr mountpoint /usr inherited from rpool/ROOT/ubuntu_7yn8t5
rpool/ROOT/ubuntu_7yn8t5/usr/local mountpoint /usr/local inherited from rpool/ROOT/ubuntu_7yn8t5
rpool/ROOT/ubuntu_7yn8t5/var mountpoint /var inherited from rpool/ROOT/ubuntu_7yn8t5
rpool/ROOT/ubuntu_7yn8t5/var/games mountpoint /var/games inherited from rpool/ROOT/ubuntu_7yn8t5
rpool/ROOT/ubuntu_7yn8t5/var/lib mountpoint /var/lib inherited from rpool/ROOT/ubuntu_7yn8t5
rpool/ROOT/ubuntu_7yn8t5/var/lib/AccountsService mountpoint /var/lib/AccountsService inherited from rpool/ROOT/ubuntu_7yn8t5
rpool/ROOT/ubuntu_7yn8t5/var/lib/NetworkManager mountpoint /var/lib/NetworkManager inherited from rpool/ROOT/ubuntu_7yn8t5
rpool/ROOT/ubuntu_7yn8t5/var/lib/apt mountpoint /var/lib/apt inherited from rpool/ROOT/ubuntu_7yn8t5
rpool/ROOT/ubuntu_7yn8t5/var/lib/dpkg mountpoint /var/lib/dpkg inherited from rpool/ROOT/ubuntu_7yn8t5
rpool/ROOT/ubuntu_7yn8t5/var/log mountpoint /var/log inherited from rpool/ROOT/ubuntu_7yn8t5
rpool/ROOT/ubuntu_7yn8t5/var/mail mountpoint /var/mail inherited from rpool/ROOT/ubuntu_7yn8t5
rpool/ROOT/ubuntu_7yn8t5/var/snap mountpoint /var/snap inherited from rpool/ROOT/ubuntu_7yn8t5
rpool/ROOT/ubuntu_7yn8t5/var/spool mountpoint /var/spool inherited from rpool/ROOT/ubuntu_7yn8t5
rpool/ROOT/ubuntu_7yn8t5/var/www mountpoint /var/www inherited from rpool/ROOT/ubuntu_7yn8t5
rpool/USERDATA mountpoint / local
rpool/USERDATA/hyacinthe_nurhv0 mountpoint /home/hyacinthe local
rpool/USERDATA/root_nurhv0 mountpoint /root local
root@UBU2204:/#
I'm trying to understand the process of 10 years ago. Not easy !
askubuntu.com/questions/123126/how-do-i-mount-a-zfs-pool
@Amitie 10g
If you can import the pool, you may want to set the mountpoint flag
rather than using the traditional mount command: zfs set
mountpoint=
I don't quite understand your proposal. I just want to replace my ten year old NTFS formatted 4TB data drive with a brand new ZFS formatted 10TB drive due to the better performance of this file system. I naively thought that formatting a drive to ZFS was as easy as formatting it to FAT32, NTFS, exFAT, or ext4. I see that is not the case. But if until today, I cannot manage to use my disk in ZFS, there must be an explanation. Which ? Where did I make a mistake?
