The AV Science Forums have a post for Windows Home Server users about a new tool that helps with drive balancing.
The utility balances all the data on your drive pool equally, the main purpose being that when a person adds a drive to the pool, it doesn’t necessarily start getting used for a while. While Microsoft has made changes to the usage of the Landing Zone (as in it doesn’t exist anymore), some people’s systems might still be in a non “evened out” state and wish to correct this. On the authors own system, he routinely gets within 2% of perfect balancing on all pooled drives.
NOTE: Usage instructions are available in the following forum post. Make sure you download the latest version, which at the time of publishing is version 1.01 and remember it can take a few hours to balance some systems.