[CentOS] mdadm size issues

Hi,

I am trying to create a 10 drive raid6 array. OS is Centos 5.3 (64 Bit)

All 10 drives are 2T in size.

device sd{a,b,c,d,e,f} are on my motherboard
device sd{i,j,k,l} are on a pci express areca card (relevant lspci info below)

#lspci 
06:0e.0 RAID bus controller: Areca Technology Corp. ARC-1210 4-Port PCI-Express to SATA RAID Controller

The controller is set to JBOD the drives. 

All drives have the same partition size

# fdisk -l

Disk /dev/sda: 2000.3 GB, 2000398934016 bytes
255 heads, 63 sectors/track, 243201 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1               1      243201  1953512001   83  Linux
....


I go about creating the array as follows

# mdadm --create  --verbose /dev/md3 --level=6 --raid-devices=10 /dev/sda1 /dev/sdb1 /dev/sdc1 /dev/sdd1 /dev/sde1 /dev/sdf1 /dev/sdi1 /dev/sdj1 /dev/sdk1 /dev/sdl1
mdadm: layout defaults to left-symmetric
mdadm: chunk size defaults to 64K
mdadm: size set to 1953511936K
Continue creating array?

As you  can see mdadm sets the size to 1.9T. Looking around there was this limitation on older versions of mdadm if they are the 32 bit version. I am using the 64 bit most up to date version from Centos. 

If I go ahead and say yes create the array, mdadm says the following (I have zeroed the drives before adding them and creating the array)

# mdadm --detail /dev/md3
/dev/md3:
        Version : 0.90
  Creation Time : Thu Sep 24 23:48:32 2009
     Raid Level : raid6
     Array Size : 15628095488 (14904.11 GiB 16003.17 GB)
  Used Dev Size : 1953511936 (1863.01 GiB 2000.40 GB)
   Raid Devices : 10
  Total Devices : 10
Preferred Minor : 3
    Persistence : Superblock is persistent

    Update Time : Thu Sep 24 23:48:32 2009
          State : clean, resyncing
 Active Devices : 10
Working Devices : 10
 Failed Devices : 0
  Spare Devices : 0

     Chunk Size : 64K

 Rebuild Status : 0% complete

           UUID : cfa565db:4d0e07ca:b4d87a59:6e96cb06
         Events : 0.1

    Number   Major   Minor   RaidDevice State
       0       8        1        0      active sync   /dev/sda1
       1       8       17        1      active sync   /dev/sdb1
       2       8       33        2      active sync   /dev/sdc1
       3       8       49        3      active sync   /dev/sdd1
       4       8       65        4      active sync   /dev/sde1
       5       8       81        5      active sync   /dev/sdf1
       6       8      129        6      active sync   /dev/sdi1
       7       8      145        7      active sync   /dev/sdj1
       8       8      161        8      active sync   /dev/sdk1
       9       8      177        9      active sync   /dev/sdl1


Anyone got any ideas?

Nathan