Is there any easy, and potentially, free way to check the volume stats on
a lot of servers at once. Here is the scenario I face:

32 servers, all in separate OU container for each physical location.

I want to check regularly for volumes that hit 75% usage or more.

Is this possible? I know there are a few enterprise products out there
thay may be able to do this, but they also do a million other things I
don't want to pay for.