Understanding free space / volumes on Ubuntu. newbie Q

New to Ubuntu, have some questions. I am running 18.04 in a VM on Esxi 6.5, where I am running Docker containers. One of the apps I am running in docker is causing me some issues, one of which could be related to free disk space issues. The VM is configured for 30GB, thin provision.

Fdisk shows the disk at total 30GB as expected, but when I run df -h I am not seeing /dev/sda3. Also, what are the /loop devices?

Device Start End Sectors Size Type
/dev/sda1 2048 4095 2048 1M BIOS boot
/dev/sda2 4096 2101247 2097152 1G Linux filesystem
/dev/sda3 2101248 62912511 60811264 29G Linux filesystem

Filesystem Size Used Avail Use% Mounted on
udev 464M 0 464M 0% /dev
tmpfs 99M 1.2M 98M 2% /run
/dev/mapper/ubuntu–vg-ubuntu–lv 3.9G 3.4G 306M 92% /
tmpfs 493M 0 493M 0% /dev/shm
tmpfs 5.0M 0 5.0M 0% /run/lock
tmpfs 493M 0 493M 0% /sys/fs/cgroup
/dev/loop0 87M 87M 0 100% /snap/core/4917
/dev/loop1 98M 98M 0 100% /snap/docker/321
/dev/sda2 976M 142M 768M 16% /boot
/dev/loop2 88M 88M 0 100% /snap/core/5742
tmpfs 99M 0 99M 0% /run/user/1000

I don’t understand why there is this discrepancy, could someone kindly explain?

You probably want to ask this question on Ask Ubuntu, as this isn’t a support forum.

1 Like

This site is for coordination of the Ubuntu project(s), not technical support. Sorry.

These questions have been answered many times in our technical support venues, so feel free to use their ‘Search’ feature(s) to find similar questions asked and answered before. If you don’t understand those answers, feel free to ask there - each has dozens of skilled volunteers to help you learn the world’s best operating system.