Kernel 2.6.17 and RAID5 Grow Problem (critical section backup)

[Justin Piszcz <jpiszcz@lucidpixels.com>]

p34:~# mdadm /dev/md3 -a /dev/hde1
mdadm: added /dev/hde1

p34:~# mdadm -D /dev/md3
/dev/md3:
        Version : 00.90.03
  Creation Time : Fri Jun 30 09:17:12 2006
     Raid Level : raid5
     Array Size : 1953543680 (1863.04 GiB 2000.43 GB)
    Device Size : 390708736 (372.61 GiB 400.09 GB)
   Raid Devices : 6
  Total Devices : 7
Preferred Minor : 3
    Persistence : Superblock is persistent

    Update Time : Fri Jul  7 08:25:44 2006
          State : clean
 Active Devices : 6
Working Devices : 7
 Failed Devices : 0
  Spare Devices : 1

         Layout : left-symmetric
     Chunk Size : 512K

           UUID : e76e403c:7811eb65:73be2f3b:0c2fc2ce
         Events : 0.232940

    Number   Major   Minor   RaidDevice State
       0      22        1        0      active sync   /dev/hdc1
       1      56        1        1      active sync   /dev/hdi1
       2       3        1        2      active sync   /dev/hda1
       3       8       49        3      active sync   /dev/sdd1
       4      88        1        4      active sync   /dev/hdm1
       5       8       33        5      active sync   /dev/sdc1

       6      33        1        -      spare   /dev/hde1
p34:~# mdadm --grow /dev/md3 --raid-disks=7
mdadm: Need to backup 15360K of critical section..
mdadm: Cannot set device size/shape for /dev/md3: No space left on device
p34:~# mdadm --grow /dev/md3 --bitmap=internal --raid-disks=7
mdadm: can change at most one of size, raiddisks, bitmap, and layout
p34:~# umount /dev/md3
p34:~# mdadm --grow /dev/md3 --raid-disks=7
mdadm: Need to backup 15360K of critical section..
mdadm: Cannot set device size/shape for /dev/md3: No space left on device
p34:~#

The disk only has about 350GB of 1.8TB used, any idea why I get this 
error?

I searched google but could not find anything on this issue when trying to 
grow the array?


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