newpath="isis"
newsize="2600G"
lvcreate -n $newpath -L $newsize vg0
mkfs.ext4 /dev/vg0/$newpath
mkdir /srv/$newpath
 
nano /etc/fstab
 
systemctl daemon-reload
mount /srv/$newpath/
proxmox-backup-manager datastore create $newpath /srv/$newpath