I'm trying to figure out the proper system layout for transferring data from fast storage to slow storage with minimal bottlenecks. I have a fast array of RAID 0 NVME drives used for daily tasks. At set intervals I'll transfer data no longer used to HDDs for long term storage. I'd like to minimize the time the NVME drives spend transferring data.
Which file systems should be used on the NVME drive? I'm guessing ext4 would be a good choice. Which on the HDDs? Would ZFS provide any speed benefits?