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Our SCv2020 has 12 x 600GB 12G 15K SAS installed at the moment.  Can I add 6 x 1TB 6G 15K SAS and 6 x 900GB 6G 15K SAS in those available slots? Would 6G makes any difference in terms of performance? Like performance hit? Because the existing 12 disks are 12G.  Can 12G and 6G can be installed in one compellent?  Your advise would be highly appreciated. 
Different speed disks in Compellent SCv2020