Hi oporras,
VMmark is typically used to run as many tiles as possible in a cluster and still achieve a passing score.
To find a rough estimate of how many tiles your cluster will support, you can look at the VMmark results page. Try filtering results by the total number of cores you have in your cluster. You may also be able to find a published VMmark result which uses the same or similar processor to your cluster, and extrapolate the number of tiles.
You are also thinking about the memory and storage requirements for VMmark, that is good.
Check the "System Requirements" on the VMmark website https://www.vmware.com/products/vmmark.html as it lists the amount of memory and storage needed for each tile.
After you provision VMmark 3 with the tiles you calculated, see whether the run passed or failed (see the VMmark User's Guide for details).
If it passed, you need to provision more tiles so you can find the largest number of tiles that passes.
If it failed you need to run VMmark 3 with one less tile. Continue until you have a passing run.
