diff --git a/generated_types/protos/influxdata/iox/ingester/v1/write.proto b/generated_types/protos/influxdata/iox/ingester/v1/write.proto
index db545d7a1f..2737124889 100644
--- a/generated_types/protos/influxdata/iox/ingester/v1/write.proto
+++ b/generated_types/protos/influxdata/iox/ingester/v1/write.proto
@@ -18,6 +18,9 @@ service PersistService {
   rpc Persist(PersistRequest) returns (PersistResponse);
 }
 
-message PersistRequest {}
+message PersistRequest {
+  // The namespace to persist
+  string namespace = 1;
+}
 
 message PersistResponse {}
diff --git a/influxdb_iox/tests/end_to_end_cases/querier.rs b/influxdb_iox/tests/end_to_end_cases/querier.rs
index 2280561945..fb145b97f0 100644
--- a/influxdb_iox/tests/end_to_end_cases/querier.rs
+++ b/influxdb_iox/tests/end_to_end_cases/querier.rs
@@ -903,16 +903,7 @@ mod kafkaless_rpc_write {
         let table_name = "the_table";
 
         // Set up the cluster  ====================================
-        let ingester_config = TestConfig::new_ingester2_never_persist(&database_url);
-        let router_config = TestConfig::new_router2(&ingester_config);
-        let querier_config = TestConfig::new_querier2(&ingester_config);
-        let mut cluster = MiniCluster::new()
-            .with_ingester(ingester_config)
-            .await
-            .with_router(router_config)
-            .await
-            .with_querier(querier_config)
-            .await;
+        let mut cluster = MiniCluster::create_shared2_never_persist(database_url).await;
 
         StepTest::new(
             &mut cluster,
@@ -951,16 +942,7 @@ mod kafkaless_rpc_write {
         let table_name = "the_table";
 
         // Set up the cluster  ====================================
-        let ingester_config = TestConfig::new_ingester2_never_persist(&database_url);
-        let router_config = TestConfig::new_router2(&ingester_config);
-        let querier_config = TestConfig::new_querier2(&ingester_config);
-        let mut cluster = MiniCluster::new()
-            .with_ingester(ingester_config)
-            .await
-            .with_router(router_config)
-            .await
-            .with_querier(querier_config)
-            .await;
+        let mut cluster = MiniCluster::create_shared2_never_persist(database_url).await;
 
         StepTest::new(
             &mut cluster,
diff --git a/influxdb_iox/tests/end_to_end_cases/querier/influxrpc.rs b/influxdb_iox/tests/end_to_end_cases/querier/influxrpc.rs
index 8facdb19bb..d8e9156e4f 100644
--- a/influxdb_iox/tests/end_to_end_cases/querier/influxrpc.rs
+++ b/influxdb_iox/tests/end_to_end_cases/querier/influxrpc.rs
@@ -98,7 +98,7 @@ trait InfluxRpcTest: Send + Sync + 'static {
                         .await
                 }
                 IoxArchitecture::Kafkaless => {
-                    MiniCluster::create_non_shared2_never_persist(database_url.clone()).await
+                    MiniCluster::create_shared2_never_persist(database_url.clone()).await
                 }
             };
 
diff --git a/influxdb_iox/tests/query_tests2/framework.rs b/influxdb_iox/tests/query_tests2/framework.rs
index 67e566e55d..da5f9adc73 100644
--- a/influxdb_iox/tests/query_tests2/framework.rs
+++ b/influxdb_iox/tests/query_tests2/framework.rs
@@ -66,10 +66,10 @@ impl TestCase {
             for chunk_stage in self.chunk_stage {
                 info!("Using IoxArchitecture::{arch:?} and ChunkStage::{chunk_stage:?}");
 
-                // Setup that differs by architecture and chunk stage. These need to be non-shared
-                // clusters; if they're shared, then the tests that run in parallel and persist at
-                // particular times mess with each other because persistence applies to everything in
-                // the ingester.
+                // Setup that differs by architecture and chunk stage. In the Kafka architecture,
+                // these need to be non-shared clusters; if they're shared, then the tests that run
+                // in parallel and persist at particular times mess with each other because
+                // persistence applies to everything in the ingester.
                 let mut cluster = match (arch, chunk_stage) {
                     (IoxArchitecture::Kafkaful, ChunkStage::Ingester) => {
                         MiniCluster::create_non_shared_standard_never_persist(database_url.clone())
@@ -79,10 +79,10 @@ impl TestCase {
                         MiniCluster::create_non_shared_standard(database_url.clone()).await
                     }
                     (IoxArchitecture::Kafkaless, ChunkStage::Ingester) => {
-                        MiniCluster::create_non_shared2_never_persist(database_url.clone()).await
+                        MiniCluster::create_shared2_never_persist(database_url.clone()).await
                     }
                     (IoxArchitecture::Kafkaless, ChunkStage::Parquet) => {
-                        MiniCluster::create_non_shared2(database_url.clone()).await
+                        MiniCluster::create_shared2(database_url.clone()).await
                     }
                     (_, ChunkStage::All) => unreachable!("See `impl IntoIterator for ChunkStage`"),
                 };
diff --git a/influxdb_iox_client/src/client/ingester.rs b/influxdb_iox_client/src/client/ingester.rs
index 3c550538a9..0d33f5bac0 100644
--- a/influxdb_iox_client/src/client/ingester.rs
+++ b/influxdb_iox_client/src/client/ingester.rs
@@ -21,11 +21,11 @@ impl Client {
         }
     }
 
-    /// Instruct the ingester to persist its data to Parquet. Will block until the data has
-    /// persisted, which is useful in tests asserting on persisted data. May behave in unexpected
-    /// ways if used concurrently with writes and ingester WAL rotations.
-    pub async fn persist(&mut self) -> Result<(), Error> {
-        self.inner.persist(PersistRequest {}).await?;
+    /// Instruct the ingester to persist its data for the specified namespace to Parquet. Useful in
+    /// tests asserting on persisted data. May behave in unexpected ways if used concurrently with
+    /// writes and ingester WAL rotations.
+    pub async fn persist(&mut self, namespace: String) -> Result<(), Error> {
+        self.inner.persist(PersistRequest { namespace }).await?;
 
         Ok(())
     }
diff --git a/ingester/src/server/grpc/persist.rs b/ingester/src/server/grpc/persist.rs
index 9eaee5850b..bccfa52e31 100644
--- a/ingester/src/server/grpc/persist.rs
+++ b/ingester/src/server/grpc/persist.rs
@@ -25,6 +25,9 @@ impl<I: IngestHandler + 'static> PersistService for PersistHandler<I> {
         &self,
         _request: Request<proto::PersistRequest>,
     ) -> Result<Response<proto::PersistResponse>, tonic::Status> {
+        // Even though the request specifies the namespace, persist everything. This means tests
+        // that use this API need to be using non-shared MiniClusters in order to avoid messing
+        // with each others' states.
         self.ingest_handler.persist_all().await;
 
         Ok(Response::new(proto::PersistResponse {}))
diff --git a/ingester2/src/server/grpc.rs b/ingester2/src/server/grpc.rs
index 400392c551..69f0d58158 100644
--- a/ingester2/src/server/grpc.rs
+++ b/ingester2/src/server/grpc.rs
@@ -120,6 +120,7 @@ where
         PersistServiceServer::new(PersistHandler::new(
             Arc::clone(&self.buffer),
             Arc::clone(&self.persist_handle),
+            Arc::clone(&self.catalog),
         ))
     }
 
diff --git a/ingester2/src/server/grpc/persist.rs b/ingester2/src/server/grpc/persist.rs
index a9586dd437..2431132fa9 100644
--- a/ingester2/src/server/grpc/persist.rs
+++ b/ingester2/src/server/grpc/persist.rs
@@ -5,12 +5,15 @@ use crate::{
 use generated_types::influxdata::iox::ingester::v1::{
     self as proto, persist_service_server::PersistService,
 };
+use iox_catalog::interface::Catalog;
+use std::sync::Arc;
 use tonic::{Request, Response};
 
 #[derive(Debug)]
 pub(crate) struct PersistHandler<T, P> {
     buffer: T,
     persist_handle: P,
+    catalog: Arc<dyn Catalog>,
 }
 
 impl<T, P> PersistHandler<T, P>
@@ -18,10 +21,11 @@ where
     T: PartitionIter + Sync + 'static,
     P: PersistQueue + Clone + Sync + 'static,
 {
-    pub(crate) fn new(buffer: T, persist_handle: P) -> Self {
+    pub(crate) fn new(buffer: T, persist_handle: P, catalog: Arc<dyn Catalog>) -> Self {
         Self {
             buffer,
             persist_handle,
+            catalog,
         }
     }
 }
@@ -37,9 +41,27 @@ where
     /// concurrently with writes and ingester WAL rotations.
     async fn persist(
         &self,
-        _request: Request<proto::PersistRequest>,
+        request: Request<proto::PersistRequest>,
     ) -> Result<Response<proto::PersistResponse>, tonic::Status> {
-        persist_partitions(self.buffer.partition_iter(), &self.persist_handle).await;
+        let request = request.into_inner();
+
+        let namespace = self
+            .catalog
+            .repositories()
+            .await
+            .namespaces()
+            .get_by_name(&request.namespace)
+            .await
+            .map_err(|e| tonic::Status::internal(e.to_string()))?
+            .ok_or_else(|| tonic::Status::not_found(&request.namespace))?;
+
+        persist_partitions(
+            self.buffer
+                .partition_iter()
+                .filter(|p| p.lock().namespace_id() == namespace.id),
+            &self.persist_handle,
+        )
+        .await;
 
         Ok(Response::new(proto::PersistResponse {}))
     }
diff --git a/test_helpers_end_to_end/src/mini_cluster.rs b/test_helpers_end_to_end/src/mini_cluster.rs
index b14feec9d4..b4c8b87fb0 100644
--- a/test_helpers_end_to_end/src/mini_cluster.rs
+++ b/test_helpers_end_to_end/src/mini_cluster.rs
@@ -494,7 +494,10 @@ impl MiniCluster {
         let mut ingester_client =
             influxdb_iox_client::ingester::Client::new(self.ingester().ingester_grpc_connection());
 
-        ingester_client.persist().await.unwrap();
+        ingester_client
+            .persist(self.namespace().into())
+            .await
+            .unwrap();
     }
 
     /// Get a reference to the mini cluster's other servers.