I'm currently running 3 x ReadyNAS RN104s which have given decent service but are reaching the end of their useful life (at least for me). The last upgrade to 4 x 8Tb per unit (Giving about 21.5Tb capacity) was problematic. Apart from the time spent shuffling data to the new disks, I was finding regular BTRFS failures (with rebuilds that just took weeks!) until I turned all caching and performance options off.
I'm thinking of replacing the whole lot with a single self-built NAS based around a Gen-5 Core i7 processor, 8 hot swappable bays and a decent amount of on board RAM - probably 64Gb.
I'm also looking to fit a 2.5Gb Network card as Gigabit LAN isn't cutting it with my homelab cluster. I have the house networked with CAT 6e so think I've got the necessary networking in place (bar upgrading a few switches in key areas).
Disk wise, I'm looking at these:
https://www.amazon.co.uk/gp/product/B0B94KG3J9?psc=1
Which would give a total capacity of 120Tb in RAID 6 (currently not supported by the ReadyNAS units) and far greater than the 63Tb I currently have.
Before I spend anything, I'd love comments on the suitability of this kind of build. Any warnings, things I should be considerig. Plus a recommendation of what software to run - I was thinking of TrueNAS Scale:
https://www.truenas.com/download-truenas-community-edition/