I am using the same rough model, and I'm using that on a 1.5 TB db running on Raspberry PI very successfully. Pretty much all storage libraries written in the

I am using the same rough model, and I'm using that on a 1.5 TB db running on Raspberry PI very successfully. Pretty much all storage libraries written in the past couple of decades are using single writer. Note that single writer doesn't mean single transaction. Merging transactions is easy and highly profitable, after all.