Multiple nodes on a raspberry pi 4?

[Ambifacient]

You could use something like LVM cache or bcache.

Metadata cache ext4 (RAM maxed)

Hi, I maxed out my system RAM and is not enough for my nodes. Less than 1gb per TB. I have ext4 in a Ubuntu 22 server. How can I add a 4tb SSD specialized for metadata caching? First cache in RAM then SSD. My system is slowing down with this massive gargabe deleting

I wonder how well ZFS special metadata device works when under low RAM too.

But if you haven’t purchased the Pi 5, consider buying an N100 mini PC, you could put in a 32GB SODIMM.