At the CLI, yes, in an MMC, no, because the MMC is making MSRPC calls to the LWIOD on just one node at a time, which as you've indicated is very hit and miss.

So at the CLI, you could do something like this:

isi_for_array -s "isi smb openfiles list"

Here is my output on an empty and idle cluster:

isilon3-1: ID Path

isilon3-1: -------

isilon3-1: -------

isilon3-1: Total: 0

isilon3-2: ID Path

isilon3-2: -------

isilon3-2: -------

isilon3-2: Total: 0

isilon3-3: ID Path

isilon3-3: -------

isilon3-3: -------

isilon3-3: Total: 0

isi_for_array = runs the command on every node

(-s switch) = runs the command in a serial manner, 1 node at a time, get all those responses then move to the next node.  This is slower than without the -s switch, however the results are easier to interpret.

Hope this helps:

~Chris