[Zope] Increasing ulimit

Hi On a busy Zope instance, we're getting increasingly more often errors of "too many files open". I already added a line in the start script for that instance to increase the ulimit to 1024 (the maximum for the machine by default). I am now considering increasing the maximum for that machine to 2048 (or higher), but wanted to know if other people have experimented with this before and what risks/dangers I should be aware of doing this. Here's what my start script looks at the moment (simplified):

ulimit -n 1024 python /customer_dir/customer_one/z2.py -X -a212.96.140.5 -w80

This is Zope 2.4 on a Solaris (Intel) box. Cheers Marc