@@ -141,0 +144,4 @@
+	}
+
+	pub fn write_quorum(self: &Arc<Self>) -> usize {
+		self.replication_factor.read_quorum(self.consistency_mode)

@@ -20,1 +18,3 @@
-			_ => None,
+impl ConsistencyMode {
+	pub fn parse(s: &str) -> Option<Self> {
+		serde_json::from_value(serde_json::Value::String(s.to_string())).ok()

@@ -21,4 +34,4 @@
 		}
 	}
 
 	pub fn control_write_max_faults(&self) -> usize {

@@ -62,0 +56,4 @@
+		match consistency_mode {
+			ConsistencyMode::Dangerous => 1,
+			ConsistencyMode::Degraded | ConsistencyMode::Consistent => {
+				(self.replication_factor() + 1) - self.read_quorum(consistency_mode)

@@ -63,2 +62,4 @@
 	}
 }
+
+impl Serialize for ReplicationFactor {

@@ -46,3 +39,1 @@
-	}
-	fn max_write_errors(&self) -> usize {
-		self.replication_factor - self.write_quorum
+		self.layout_manager.read_quorum()

@@ -37,2 +35,3 @@
+	/// - 3 is the recommended and supported setting.
 	// (we can add more aliases for this later)
-	pub replication_mode: String,
+	pub replication_factor: usize,

@@ -39,0 +40,4 @@
+	/// - Degraded -> Disable read quorum
+	/// - Dangerous -> Disable read and write quorum
+	#[serde(default)]
+	pub consistency_mode: String,

@@ -9,3 +9,3 @@
 
 ```toml
-replication_mode = "3"
+replication_factor = 3

@@ -161,4 +153,3 @@
-
 - `3`: data stored on Garage will be stored on three different nodes, if
   possible each in a different zones.  Garage tolerates two node failure, or
   several node failures but in no more than two zones (in a deployment with at