postgresql: disable full_page_writes

services/postgresql.nix

@@ -19,6 +19,14 @@
     enable = true;
     package = pkgs.postgresql_16;
     dataDir = service_configs.postgres.dataDir;
+    settings = {
+      # ZFS provides checksumming and atomic writes, making PostgreSQL's
+      # full_page_writes redundant. Disabling reduces write amplification
+      # and SSD wear on the zpool.
+      # Did this in conjunction with setting recordsize=8k
+      # on the zvolume this is on
+      full_page_writes = false;
+    };
   };
 
 }