used

Hi, I tried to answer a question with a link explaining Proxmox disk usage displays in the Web GUI, but I did not find a posting explaining it (possibly because I searched wrongly), so I decided to write a brief overview. I try to explain simple, even if sometimes not 100% accurate...

How can this data be interpreted? In the LVM tab, I have information about the use of space in 100%, in the summary I have 1% use. What it comes from ? which value is correct?