Short toturial on how to set up raid5 using mdadm bigger than 2TB

Creating:
mdadm --create /dev/md5 --chunk=64 --level=raid5 --raid-devices=4 /dev/sdg1 /dev/sdh1 /dev/sdd1 /dev/sdc1 --force

Checking the status on how the raid is build
cat /proc/mdstat

md5 : active raid5 sdg1[0] sdc1[3] sdd1[2] sdh1[1]
      5860535808 blocks level 5, 64k chunk, algorithm 2 [4/4] [UUUU]

unused devices:

For more details:

mdadm --detail /dev/md5

/dev/md5:
        Version : 00.90
  Creation Time : Sun Feb 14 11:46:13 2010
     Raid Level : raid5
     Array Size : 5860535808 (5589.04 GiB 6001.19 GB)
  Used Dev Size : 1953511936 (1863.01 GiB 2000.40 GB)
   Raid Devices : 4
  Total Devices : 4
Preferred Minor : 5
    Persistence : Superblock is persistent

    Update Time : Mon Feb 15 11:58:41 2010
          State : active
 Active Devices : 4
Working Devices : 4
 Failed Devices : 0
  Spare Devices : 0

         Layout : left-symmetric
     Chunk Size : 64K

           UUID : 80766149:664cd4ae:b069a74e:50fc3f3c (local to host server.nsas.lan)
         Events : 0.19

    Number   Major   Minor   RaidDevice State
       0       8       97        0      active sync   /dev/sdg1
       1       8      113        1      active sync   /dev/sdh1
       2       8       49        2      active sync   /dev/sdd1
       3       8       33        3      active sync   /dev/sdc1

After everything is build (took some time) you have to create a partion. Since fdisk cant handel more then 2TB, you have to use parted.
parted /dev/md5

Create a GPT label.
mklable gpt

Create a Partion. Using the max possible space
mkpart primary 0 -0

Exit
exit

Now format the new partion as you like.
mkfs.xfs -L RAID /dev/md5p1

Set you config straight
mdadm --detail --scan >> /etc/mdadm/mdadm.conf

Mount it.
mount LABEL=RAID /mnt