Expanding an LVM

Hi,

I think I may have made a error in the method I have used to create 
more space on one of my servers.

Here's what I've done.

1) Backed up the LVM volume (phew)
2) Added some disks to the storage array (HP MSA 20)
3) Used the HW Array configurator to do and on-line extend of the  
Raid Array.

It was at this point I realised that I hadn't un-mounted the volume 
in question. 

The other thing I am trying to figure out is, how I am going to 
extend a Physical Volume? I think the procedure should have been to 
add a completely new array and use pvcreate, vgextend, lvextend and  
extended the filesystem (ext3).

Can anyone confirm if the procedure above is the correct? 

Right now I am considering deleting the RAID container completely and 
re-creating and restoring rather than waste any more time but before 
I do I'd like to hear it if sounds like the procedure is bound to 
fail. 

At the moment I think the best I can hope for is that the volume will 
be fine but the extra disk-space will never be seen?

Any thoughts?
Tia,
Dp.