When upgrading your offer, the VPS is automatically restarted in order to apply the new RAM and CPU values, concerning storage. You need to run some commands.
# Allows to display the partition to be increased
root@vxxx:~# lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda 8:0 0 40G 0 disk
├─sda1 8:1 0 100M 0 part /boot/efi
└─sda2 8:2 0 39.9G 0 part /
In this example the root is on /dev/sda2
.
Therefore, it is necessary to increase this partition.
growpart /dev/sda 2 && resize2fs -p /dev/sda2
To manage your VPS, here is the support link.