WARNING: GPT (GUID Partition Table) detected on '/dev/sda'! The util fdisk doesn't support GPT. Use GNU Parted.
Disk /dev/sda: 3999.7 GB, 3999688294400 bytes
255 heads, 63 sectors/track, 486267 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disk identifier: 0x00000000
Device Boot Start End Blocks Id System
/dev/sda1 1 267350 2147483647+ ee GPT
Partition 1 does not start on physical sector boundary.
/dev/sda2 1 2090 16785120 82 Linux swap / Solaris
/dev/sda3 1 218918 1758456029+ 8e Linux LVM
Partition table entries are not in disk order
Above is my "fdisk -l", my current problem is when I go and try to do "pvcreate /dev/sda2" it gives me "Can't open /dev/sda2 exclusively. Mounted filesystem?" and I have been searching google for a while now trying to find a way to fix this. There is defiantly things I tried from google but none of them ended up working.
You're trying to initialize a partition for use by LVM that's currently used by swap.
You should rather run
pvcreate /dev/sda3