Used Storage Total less than sum of VMs

[sflashet]

Hi all I was trying to figure how much space I have left for VMs on my server. Both in the GUI and with "ZFS list" it states that I have only used 237GB with 663GB left; however the VMs together total over 700GB.


The information is the same in the GUI


Here is the output of df

How much space is really being taken up by the vms? Why is it only showing 200GB used? Thanks in advance!

Edit: To show that space inside the VM is being used here is one of the windows VMs

 

[gfngfn256]

This will probably be due to thin-provisioning. So in fact the VMs disk's contain sparseness - unused areas - which the thin-provisioning knows about.
Check inside the VMs to see how much space is in-fact actually being used by each VM. Then make a total calculation, it should tally.

See these docs.

 

[sflashet]

This will probably be due to thin-provisioning. So in fact the VMs disk's contain sparseness - unused areas - which the thin-provisioning knows about.
Check inside the VMs to see how much space is in-fact actually being used by each VM. Then make a total calculation, it should tally.

See these docs.

Thanks for your resonse. I should have mentioned this but I checked. One of the VMs for example is using 300GB of 400GB

 

[UdoB]

ZFS gives you transparent compressen, for free

One random virtual disk of mine:

~# zfs get used,logicalused,compressratio  rpool/data/vm-7004-disk-0
NAME                       PROPERTY       VALUE  SOURCE
rpool/data/vm-7004-disk-0  used           19.9G  -
rpool/data/vm-7004-disk-0  logicalused    22.8G  -
rpool/data/vm-7004-disk-0  compressratio  1.15x  -

Inside of the guest 22.8 GB is used. It occupies 19.9 GB in the underlaying ZFS pool