Finding the true size of VMs/CTs on lvm-thin

[johnha]

Hi, I've been searching for a way to do this. I have a pretty standard PVE installation (ext4, lvm-thin). I'm trying to find a way to get the true amount of disk space used by the various KVMs and LXC containers. I've read the documentation and tried pvesm, read google results, searched the forum, read blog posts, refreshed my education on LVM, etc. but I still can't seem to figure it out...

I mean, somehow the GUI knows because this little cylinder icon fills up when my drive gets consumed:


But is there a command line way to get a list of my VMs and CTs and show the real size on the disk?

The only way I've found to do this (by estimation) is by looking at my backups and seeing how much space they are using.

I'm sure this has been asked and answered ... but if someone could point me in the right direction, or help me out with some example commands, I would really appreciate it! Thank you so much!!
-John

 

[H4R0]

Try entering "pvs", "vgs" and "lvs" into the shell.

 

[johnha]

Thank you so much @H4R0 -- I knew about those commands, but forgot. I guess using lvs and looking at the Data Percentage is the closest I'll get to what I'm looking for. Thanks again!

 

[enoch85]

Old thread. but same topic: how do I find out the actual data disk size from LVS? Do I need to calculate the procentage, o can I see that stats in DB/TB somewhere?

So for example here, vm-100-disk-0 is 4693 GB in **real** size?

 

[LnxBil]

So for example here, vm-100-disk-0 is 4693 GB in **real** size?

The real part is maybe not what you think. There are a lot of factors playing into this:

• deleted files (you need to trim or overwrite the free space with zeros)
• used LVM extends, (defrag your extends if possible)
• filesystem blocksize (defrag your disk)
• partition alignment (check for alignment of extend and partition boundaries)

To get more information, use:

lvdisplay pve/vm-100-disk-0