Hello emtelf,

Here is a link to the Deployment Guide which has the best practice guides for setting up your ME4024. https://topics-cdn.dell.com/pdf/powervault-me4024_deployment-guide_en-us.pdf

The wizard is trying to set the system up with a pool for each controller.  You can manually set the drives for each pool, as the wizard has selected what it thinks is best based on the drives in the system. 

Please let us know if you have any other questions.