Below is a quick cheatsheet that lists the commands used to quickly create an LVM partition.

These commands partition a disk using fdisk:

fdisk /dev/sdb (assuming that the drive you want to edit is "sdb")

   create a new partition (n)

   change the partition type to be Linux LVM (t 8e)

   write changes (w)

These are the actual LVM commands:

pvcreate /dev/sdbX

vgcreate vg /dev/sdbX

lvcreate -l +100%FREE -n opt vg

mkfs.xfs /dev/vg/opt

You now have an LVM disk that is formatted as XFS that can be mounted manually or added to your fstab