Wrong datastore usage displayed when datastore is on root disc

[juliokele]

ds-1 and ds-2 on a root disc
ds-2 and ds-3 on zfs datasets

proxmox-backup-manager version --verbose
proxmox-backup                unknown      running kernel: 6.2.11-2-pve
proxmox-backup-server         2.4.2-1      running version: 2.4.2 
ifupdown2                     3.1.0-1+pmx4                         
libjs-extjs                   7.0.0-1                             
proxmox-backup-docs           2.4.2-1                             
proxmox-backup-client         unknown                             
proxmox-mail-forward          0.1.1-1                             
proxmox-mini-journalreader    1.2-1                               
proxmox-offline-mirror-helper 0.5.1-1                             
proxmox-widget-toolkit        3.7.0                               
pve-xtermjs                   4.16.0-1                             
smartmontools                 7.2-pve3                             
zfsutils-linux                unknown

 

[Dunuin]

PBS doesn't track how much space the actual files consume. It just reports the size/usage based on what the filesystem is reporting.
To get the size of the datastores you can have a look at the last lines of your most recent GC task.

 

[juliokele]

PBS doesn't track how much space the actual files consume. It just reports the size/usage based on what the filesystem is reporting.
To get the size of the datastores you can have a look at the last lines of your most recent GC task.

I don't need the space that the actual files consume.
I need the space that the whole datastore(s) take up.

 

[dcsapak]

I don't need the space that the actual files consume.
I need the space that the whole datastore(s) take up.

but that's the same?

as @Dunuin already wrote, we just report the filesystem usage here, everything else would be way to expensive to do often
if you really need to have the datastore usage, you have to put it on a separate file system (e.g. different partition/lvm/etc.)

 

[juliokele]

but that's the same?

as @Dunuin already wrote, we just report the filesystem usage here, everything else would be way to expensive to do often
if you really need to have the datastore usage, you have to put it on a separate file system (e.g. different partition/lvm/etc.)

The Datastore usage is actually the Filesystem usage? It's very confusing, isn't it?

 

[dcsapak]

The Datastore usage is actually the Filesystem usage? It's very confusing, isn't it?

as i said, everything else we'd want to show here is too expensive, and in many setups the datastores are in dediacted filesystems/partitions/subvolumes/etc. so this is not an issue
also, you'd generally want to gauge the filesystem usage for the datastore when it's shared anyway...

 

[Impact]

Somewhere else someone suggested to gather/store/update statistics like this when the garbage collection is run which I think is a good idea as well.

 

[dcsapak]

Somewhere else someone suggested to gather/store/update statistics like this when the garbage collection is run which I think is a good idea as well.

we could, but it would be outdated as soon as someone makes a new backup. and as garbage collection is probably not a frequent operation (especially for slower & bigger datastores) this would be possibly give a false sense of security (ie. users think they have more space than they do)