I'm looking to purchase an external drive system for my .mdf files (want to increase read performance). Can anyone provide advice on which option will provide better performance? 1. MSA50 dual channel with 15k U320 drives (5 drives per channel) 2. MSA30 with 15k drives (5 drives per channel). Acually, I'm not sure how to configure the chanels on SAS. Any help with would be greatly appreciated. Thanks!