pest0n

Thank you for the quick reply! Losing a data drive during parity rebuild is a risk I'm willing to take. Your instructions sounds like I'm able to do exactly what I want, with the risk of losing data of course if a data drive should fail, but the process itself wont delete any existing data if I understand you correctly? Except for the new data drive and old parity drive which is by design and something I'm fully aware of.

Hi, I've read this whole thread but since it's going back and forth between 1 and 2 parity drives I wanted to test my specific setup and use case. I've 14 drives, 1 parity with a mix of different sizes. Parity drive is 20TB and I've bought two 28TB, one I'm gonna have to replace parity drive with and the second will be on the shelf as a spare drive. I've one slot left to add a drive, my plan therefore is to add one 28TB, switch current parity drive to 28TB and then expand the array with the 15th drive (old parity 20TB) and rebuild/expand at the same time. Something tells me this is very bad practice, or wont even work but I'm hoping I can kill two birds with one stone. Is it possible to expand and rebuild parity at the same time? Since I've big drives, the rebuild will take a long time so if I can do those two tasks concurrently, I'd be very happy. I know about the risks, and having only single parity is not best practice - I know. But all content can be re-fetched so I'm OK to live with the risk. The only thing I want to avoid is executing my plan only to realize I've erased everything knowingly/by mistake. Thanks