This is a known problem and is fixed in the 3.1.2.0 release.  Check the readme 
file for the release, I think the APAR # is IC21281.

Bill Nowlin wrote:

> Greetings,
> I am running ADSM 3.1.1.3 on a SUN 450 (Solaris2.6) with a STK9730(DLT7000) 
> library attached. It seems to take a very long time for the robot to respond 
> to mount requests, sometimes 4-5 minutes. This is the time for the robot to 
> pick the tape....positioning the tape is on top of that. I'm not sure if the 
> robot is sloww to respond or if the requests are delayed from ADSM. I see the 
> slowness when I do a "backup db...", "label libvol...", "upd stg ... hi=0 
> lo=0". Anyone have any ideas what I can look for?
> Thanks
> Bill Nowlin
> CoComp