[CentOS] Centos 5.1 ext3 filesystem limit

Centos 5.1 documentation states that the supported ext3 filesystem limit 
is 16TB,  yet I have a 9.5TB partition that is claimed to be too large:

mke2fs 1.39 (29-May-2006)
mke2fs: Filesystem too large.  No more than 2**31-1 blocks
         (8TB using a blocksize of 4k) are currently supported.

Am I missing something?

 > uname -a
Linux fileserver.sharcnet.ca 2.6.18-53.1.6.el5 #1 SMP Wed Jan 23 
11:28:47 EST 2008 x86_64 x86_64 x86_64 GNU/Linux

-- 
Gary Molenkamp			SHARCNET
Systems Administrator		University of Western Ontario
gary at sharcnet.ca		http://www.sharcnet.ca
(519) 661-2111 x88429		(519) 661-4000