PLEASE HELP! maximum size of DB in 2.0.7

[Dan Shriver <dshriver@sharemedia.com>]

We recently were trying to add 5 million entries to a directory
server on a system with XFS filesystem and openLDAP 2.0.7.  At
when the db grew to 2^31 it refused to accept any more entries. 
A ~2Gig file is far too small for us.  What is the workaround? 
Is this bug just in 2.0.7 (we did not try loading 2.0.11 on the
other box since it is a production machine, but if we do deploy
with openLDAP we plan to use 2.0.11).