Huggies15

Hi, This has been asked a number of times before and I've read through a lot of threads, but its my fist time doing this and wanted to double check for sanity. I have an array currently running with 3 x 4tb drives and 1 x 8tb parity drive. Thanks to black friday sales I now own 2 x 18tb drives. I want to add these to the array whilst removing 1 x 4tb drive (I want to put it in another machine), giving the following: 1 x 18tb parity, 1 x 18tb + 1 x 8tb + 2 x 4tb array. Is the most sensible way to do this: Run a Parity check. Stop the array. Power down. Remove Parity drive (doesnt need to be physically removed, I will just disconnect it) and install 1 x 18tb drive. Power on. Assign 18tb drive as Parity. Start the array. Build Parity drive. Stop the array. Power down. Remove 1 x 4tb drive, install 1 x 18tb drive and reinstall the 8tb drive. Power on. Assign new drives to the aray. Start the array. Data should be rebuilt, leaving a fully working system as described above? I guess this might not be the most efficient way, but by doing it stepwise it makes me slightly more comfortable and I am happy with any additional time it needs. I feel like I am missing a step when I remove the 4tb drive but cant work out what that is. Thanks