Ages ago I've impleted project named BlocksExplorer, with a various of ways of using it

One of them is generating a picture of of the database, and visualization of defragmentation.

I think I tried it once on 2TB Database, but that was long time ago.

Anyway, this tool generates picture in BMP format, where each pixel represents each block in the database, so, for 

For 2TB database, it will be around 268435456 blocks, that will be a picture 16384x16384, and in BMP with a 3 bytes per pixel, it will be around 768MB for this picture, quite big one

This project is fully open, you can try to modify it a bit, and maybe if you do it per global, you will be able to make a map

Ensemble was renamed to Interoperability and its part of any IRIS editions 

There is one more way of getting it, is using ASQ

USER> write responseData.apply("$.items[0].titles[0].value.en_US").%Get(0)

Professor