ZFS used space in GUI

[greg]

Greetings
I'm having trouble interpreting the values shown in "Storage" ; for example, it shows:

subvol-134-disk-0       375.81 GB

but in CLI:

# zfs list -o space -r rpool/ct/subvol-134-disk-0
NAME                        AVAIL   USED  USEDSNAP  USEDDS  USEDREFRESERV  USEDCHILD
rpool/ct/subvol-134-disk-0  86.6G  1.02T      785G    263G             0B         0B

I'm trying to understand what is taking so much space on my disk.
How is calculated the number in the GUI?

Thanks in advance

Regards

 

[Dunuin]

Accoding to your "zfs list -o space -r rpool/ct/subvol-134-disk-0" 263GB of the dataset is used by data + 785GB is used by snapshots.
Make sure not to keep snapshots more than a few days or weeks because they will grow over time and getting bigger and bigger.
For long term backups its better to setup a PBS as these won'T grow over time and can even save space compared to snapshots because of the deduplication.

 

[sterzy]

Also note that the UI seems to use GB and the command GiB as the unit of measurement.

 

[greg]

Thanks for your answers.
My understanding is that the GUI shows the "max theoretical" size (i.e. the size of the volume as shown in the the guest), where the CLI shows the actual used space.
My problem is, if I sum all the snapshots, I'm about 300G, very far from the 785G in USEDSNAP...