LVM

A few LVM features you can use to interact with your disks...

Show logical volumes

# lvs

   LV              VG  Attr       LSize   Pool Origin Data%  Meta%  Move Log Cpy%Sync Convert
   data            pve twi-aotz--  <1.60t             46.02  1.68
   pbs             pve Vwi-aotz-- 700.00g data        95.11
   root            pve -wi-ao----  96.00g
   swap            pve -wi-ao----  <7.59g

Create a logical volume in a thin pool

# lvcreate -V ${size}G -T -n ${name} ${vg}/${lv}

Extend a logical volume

Works the same way for any logical volume

lvextend -L +${size}G /dev/${vg}/${lv}

The disk is larger, but your partition isn't using the additional space

umount /dev/${vg}/${lv}
e2fsck -f /dev/${vg}/${lv}
resize2fs /dev/${vg}/${lv}
e2fsck -f /dev/${vg}/${lv}

Reduce a logical volume

You should have plenty of free disk space and the Data% from lvs low enough so that the shrunk disk won't reach 100 Data% lvs

lvreduce -L 20G /dev/dev/${vg}/${lv} --resizefs