diff --git a/test/volume_server/grpc/data_stream_success_test.go b/test/volume_server/grpc/data_stream_success_test.go
index 90f2a8248..2cfdee9d6 100644
--- a/test/volume_server/grpc/data_stream_success_test.go
+++ b/test/volume_server/grpc/data_stream_success_test.go
@@ -3,6 +3,7 @@ package volume_server_grpc_test
 import (
 	"context"
 	"io"
+	"net/http"
 	"strings"
 	"testing"
 	"time"
@@ -230,6 +231,71 @@ func TestReadAllNeedlesExistingThenMissingVolumeAbortsStream(t *testing.T) {
 	}
 }
 
+func TestReadAllNeedlesStreamsAcrossMultipleVolumes(t *testing.T) {
+	if testing.Short() {
+		t.Skip("skipping integration test in short mode")
+	}
+
+	clusterHarness := framework.StartSingleVolumeCluster(t, matrix.P1())
+	conn, grpcClient := framework.DialVolumeServer(t, clusterHarness.VolumeGRPCAddress())
+	defer conn.Close()
+
+	const volumeIDA = uint32(86)
+	const volumeIDB = uint32(87)
+	const needleIDA = uint64(445561)
+	const needleIDB = uint64(445562)
+	framework.AllocateVolume(t, grpcClient, volumeIDA, "")
+	framework.AllocateVolume(t, grpcClient, volumeIDB, "")
+
+	client := framework.NewHTTPClient()
+	fidA := framework.NewFileID(volumeIDA, needleIDA, 0xAA11CC22)
+	fidB := framework.NewFileID(volumeIDB, needleIDB, 0xBB22DD33)
+	payloadA := "read-all-multi-volume-a"
+	payloadB := "read-all-multi-volume-b"
+
+	uploadA := framework.UploadBytes(t, client, clusterHarness.VolumeAdminURL(), fidA, []byte(payloadA))
+	_ = framework.ReadAllAndClose(t, uploadA)
+	if uploadA.StatusCode != http.StatusCreated {
+		t.Fatalf("upload A expected 201, got %d", uploadA.StatusCode)
+	}
+	uploadB := framework.UploadBytes(t, client, clusterHarness.VolumeAdminURL(), fidB, []byte(payloadB))
+	_ = framework.ReadAllAndClose(t, uploadB)
+	if uploadB.StatusCode != http.StatusCreated {
+		t.Fatalf("upload B expected 201, got %d", uploadB.StatusCode)
+	}
+
+	ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
+	defer cancel()
+
+	stream, err := grpcClient.ReadAllNeedles(ctx, &volume_server_pb.ReadAllNeedlesRequest{
+		VolumeIds: []uint32{volumeIDA, volumeIDB},
+	})
+	if err != nil {
+		t.Fatalf("ReadAllNeedles start failed: %v", err)
+	}
+
+	seen := map[uint64]string{}
+	for {
+		msg, recvErr := stream.Recv()
+		if recvErr == io.EOF {
+			break
+		}
+		if recvErr != nil {
+			t.Fatalf("ReadAllNeedles recv failed: %v", recvErr)
+		}
+		if msg.GetNeedleId() == needleIDA || msg.GetNeedleId() == needleIDB {
+			seen[msg.GetNeedleId()] = string(msg.GetNeedleBlob())
+		}
+	}
+
+	if got := seen[needleIDA]; got != payloadA {
+		t.Fatalf("ReadAllNeedles missing/mismatched payload for volume A needle: got %q want %q", got, payloadA)
+	}
+	if got := seen[needleIDB]; got != payloadB {
+		t.Fatalf("ReadAllNeedles missing/mismatched payload for volume B needle: got %q want %q", got, payloadB)
+	}
+}
+
 func copyFileBytes(t testing.TB, grpcClient volume_server_pb.VolumeServerClient, req *volume_server_pb.CopyFileRequest) []byte {
 	t.Helper()