It's set:

onconfig:LBU_PRESERVE 0 # Preserve last log for log backup

Actually, a support guy at work had the answer:

onmode -l

seems to do the trick.

John Carlson wrote:

>On Mon, 14 Feb 2005 17:40:12 GMT, Thomas Ronayne
><trona@REMOVETHISameritech.net> wrote:
>
>What is LBUPRESERVE set to?
>
>
>JWC
>
>
>