Gluster users - Jun 2011 - read-ahead performance translator tweaking with 3.2.1?

Hi

Is there a way to tweak the read-ahead settings via the gluster command
line?  For example:

gluster volume set somevolumename performance.read-ahead 2

Or is this no longer feasible?  With read-ahead set to the default of
8 like was the case with standard volgen generated configs, the amount
of useless reads happening to the bricks is way too high, and on 1 GbE
interconnects causes saturation and performance degradation in no time.

Thanks.

Mohan