I want to try and improve the disk access speed of our HP DL380 G9 server. We have a RAID-5 array with 4 x 1TB drives (giving 3TB total). So that I don't have to take our main production server down, I wanted to replace a 6gb drive with a 12gb one, let the array rebuild, then do the same for one of the other 4 drives, let it rebuild, and so on and so forth until all 4 are changed and rebuilt. Is this possible, I'm assuming whilst the 6gb's are mixed with the 12gb's, the array will only work at 6gb, however as soon as all four are changed, the array will start working at 12gb. Correct?