[ubuntu] Partitioning

[ubuntu] Partitioning

I recently installed Ubuntu Server 20.04.1 LTS. I had it automatically partition my drive for me. I noticed that my root directory shows the following:


Filesystem                        Size  Used Avail Use% Mounted on
/dev/mapper/ubuntu--vg-ubuntu--lv  196G  6.1G  180G  4% /

It is a 1 TB WD HD.
Doing a fdisk on it:


Device  Start      End  Sectors SizeType
/dev/sda1    2048    1050623    1048576  512M EFI System
/dev/sda2  1050624    3147775    2097152    1G Linux filesystem
/dev/sda3  3147776 1953521663 1950373888  930G Linux filesystem

Which present a few questions. What is sda2? I assume that my root partition is on sda3. Why is it showing a size of only 196G available? Does that have to do with LVM? Will it automatically grow in size as need be? Lastly, do I really only have available to me ~930GB out of the 1TB?


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