Hi Robin, On Thu, May 30, 2019 at 09:19:41PM +0100, Robin Hill wrote: > "fastest half" means the fastest half of the mirror - the NVMe drive, as > opposed to the slower SSD. > > I suspect the slowdown is because there's no optimisation for the > 2-drive RAID-10 case, I did wonder about this. I'd love to be able to try out 4 devices but unfortunately I can't afford to buy 2 SSDs and 2 NVMe at once! For testing purposes do you think it would be worth faking it with partitions, i.e. 2 partitions on each device making a 4 device RAID-10? Thanks, Andy