For the OP, in case you go for zfs, don’t forget to create a cron job for scrubbing, truenas has support for this built in. It repairs things like bit rot, should they occur.

Depending on what you’re going to do with the cluster, 4gb of RAM per node feels rather limiting.

Anyways, as far as storage goes I’m using 4 compute blades loaded with 4 8gb RAM versions of the CM4, each with a 500gb Samsung PM9A1 running Talos to save a bit on that precious RAM.

Got Talos up and running with some help from Onedr0p’s cluster template which saved me a lot of time on the learning curve.