Problem Growing Raid 5 Array - Help Needed!

Hi Guys, I have just grown my raid 5 from 7 to 8 500Gb drives.
I am now running into this problem.
When I try to run fsck /dev/md0 I get the following:

fsck.ext2: Device or resource busy while trying to open /dev/md0
Filesystem mounted or opened exclusively by another program?

Or when I try to run resize2fs /dev/md0 to make use of new drive, I get the
following:

resize2fs: Device or resource busy while trying to open /dev/md0
Couldn’t find valid filesystem superblock.

Cat /proc/mdstat outputs:

Personalities : [raid6] [raid5] [raid4] 
md0 : active raid5 sdb1[0] sdi1[7] sdg1[6] sdh1[5] sdf1[4] sde1[3] sdd1[2]
sdc1[1]
      3418686208 blocks level 5, 256k chunk, algorithm 2 [8/8] [UUUUUUUU]
      
unused devices: <none>

However, I can still access and mount my filesystem - I just cannot grow it,
which I find very strange.
I have tried to init 1, to go to single user mode, and I have made sure file
system is unmounted, but this ‘busy’ error still occurs.

Any ideas? I’m kinda stuck. Google is no help!

I am running fedora core 7.

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