I have this issue. #1 random nvme 256gb #2 Corsair MP510 1TB (900GB) #3 samsung 980 1TB (930GB) I want to increase my cache pool and can harvest 2 ssds from my pc. both roughly 1tb. I only have 2 nvme slots, so i have to first move it to ssd #2 and mirror it this way. and after that replace #1(256gb) with ssd #3 Now i am unable to mirror my boot drive using the unraid tools on 7.3.1 And also moving back from internal boot to usb temporarily is failing for me. What do i need to do? Use clonezilla and clone the nvmes? I just want to have a bigger cache pool. and reliability for failing. Currently my idea is creating a new unraid usb boot drive. Remove the current boot drive and make sure that both ssd #2 and #3 are in place