lsblk
If you don't already have it, install parted
apt policy parted && apt install parted
then run
parted /dev/sdb mklabel gpt
parted -a opt /dev/sdb mkpart primary ext4 0% 100%
mkfs.ext4 -L storageprox /dev/sdb1
lsblk -fs
[TODO] Fill information about mounting a disk in Proxmox