The user guide has a Product Limits section that covers device size limits as well as others. The limit today for the F&F download (version 2.0.0.1) is 6TB for a device. In 2.0.0.2 (In process of getting posted - ETA is <2 weeks), the limit has been increased to 8TB.   ScaleIO currently requires storage devices support either 512n or 512e sector sizes.
What is the maximum sized disk that the ScaleIO 2.0 SDS can use ?  Is this limited to the sector size on the disk 512e or 4Kn ?
Max size disk for SDS