I set it to 0 and restarted, and it produced results!

Is there somewhere in the documentation about scripting that I missed?

Thank you for your help!

*** FINISHED ***

Result: 27706007919104

Best regards,
Victor

I'm not sure what I'm doing wrong.

Based on your error, it doesn't like something (the rootObject?) in line

foreach(o : GetObjectChildren(rootObject))

As per the script, initially that'd get the object children of object 1 (which is "Entire Network") and then move down the tree.
I wouldn't think this could break unless there is a typo in the script (direct copy&paste without a single change worked without any issues for me on two different installs) or some kind of database corruption. But Victor might have an idea.

What node do I create the DCI on?  Am I just missing something?

I did just copy & paste it into a new script.

To create a script DCI, create a new DCI and select Script under Origin. As Parameter you use the name of the script in your Script Library (see attached example for a script called "DCI::GetIPAddresses", obviously yours will be called something else).

When I try to run it against a node, I get this:

Error 14 in line 10: Function or operation argument is not an object

The server in question has the DCI FileSystem.Used on it and shows all the drives.

Also, how do I create a script DCI?  Where do I create that?

Thanks

Best regards,
Victor

Where would I put this?  Does this go in the script library?

Also, every time I use FileSystem.Used(*) it never works to enumerate all the instances.  I thought it had to be FileSystem.Used({instance})?

If you need just one number for total disk space then best approach would be script DCI that will enumerate all servers and add up used disk space. Possible script implementation is following:

// Find "Entire Network" object and start enumeration from it
global TOTAL = 0;
EnumerateNodes(FindObject(1));
return TOTAL;

// This function walks object tree recursively starting from given root
sub EnumerateNodes(rootObject)
{
	// Walk all child objects
	foreach(o : GetObjectChildren(rootObject))
	{
		if (classof(o) == "Node")
		{
			// Process node object
            for(d : FindAllDCIs(o, "FileSystem.Used(*)"))
            {
                v = GetDCIValue(o, d->id);
                if (v != null)
                {
                    TOTAL += v;
                }
            }
		}
		else
		{
			// For all other objects, go down the tree
			EnumerateNodes(o);
		}
	}
}

You should select right top level object for enumeration. Also this script does not check if same node encountered multiple times - so you either have to pass such rot object under which each node bound exactly once, ar add additional check to avoid duplicates.

Best regards,
Victor