I am building a Server 2016 box for Storage Spaces and have the following disk types:
4x 128GB SSD
4x 300GB HDD 1000rpm
4x 1TB HDD 7200rpm
4x 4TB HDD 5400rpm
Does it make sense to throw all of these into the same pool and create a 2 column 2-way mirrored volume with one of each drive-type per column or is such a variety of speeds not suggested in the same pool?