dtrace discuss - Aug 2008 - dtrace causes powered down things to be powered up?

Over the weekend I''ve been playing around with dtrace on an sb2000
that has 2 scsi drives in it - one running nv, one running s10. when
running nv, the s10 one isn''t mounted and vice versa. end result is
that the other drive doesn''t even get spun up...

... that is until I use dtrace.

First time when i use dtrace after boot, not only is there a pause while
dtrace initialises things internally, but there''s a spinup noise from
the
other hdd too...

Two questions:

is this unavoidable?

is it intentional?

Darren