FileSystem resize problem

I'm trying to add more space to a servers Logical Volumes:

I added 2 400G to our raid controller and got it configured.
To be safe, I just created a new partition /dev/sda3 instead of trying to expand /dev/sda2

I used pvcreate /dev/sda2 - it was successful
I used vgextend to include /dev/sda2 - it was successful
I then used lvextend /dev/VolGroup00/lvHome -L + 360G - it was successful
Now I'm trying to ext2online /home and I get the following:

ext2online v1.1.18 - 2001/03/18 for EXT2FS 0.5b
ext2online: ext2_open: invalid superblock
ext2online: can't open /dev/mapper/VolGroup00-lvHome

Anyway around this - will unmounting and running a disk check fix this? I really need to get this done online if possible. Very critical server. If it does need to go down, I need to get the fs resized asap and back up.
Any suggestions?
Thanks in advance

chuckbeatsAsked:
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ShineOnCommented:
Yer using EXT2 for home directories?

Anyway, it usually helps to mention your distro/version. Most commands are used and work the same, but there may be distribution-specific tools, or distro-specific known issues...

At any rate, one can but hope that taking the lv offline and running a check might help.

I've not seen a lot of stuff on the online resize for ext2 that give me warm-fuzzies...  I probably would've suggested doing the offline resize including the fsck part...
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