diff --git a/src/dbnode/integration/large_tiles_test.go b/src/dbnode/integration/large_tiles_test.go
new file mode 100644
index 0000000000..34f3f4858f
--- /dev/null
+++ b/src/dbnode/integration/large_tiles_test.go
@@ -0,0 +1,163 @@
+// +build integration
+
+// Copyright (c) 2016 Uber Technologies, Inc.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+
+package integration
+
+import (
+	"testing"
+	"time"
+
+	"github.com/m3db/m3/src/dbnode/namespace"
+	"github.com/m3db/m3/src/dbnode/retention"
+	"github.com/m3db/m3/src/dbnode/storage"
+	xmetrics "github.com/m3db/m3/src/dbnode/x/metrics"
+	xclock "github.com/m3db/m3/src/x/clock"
+	"github.com/m3db/m3/src/x/ident"
+	"github.com/m3db/m3/src/x/instrument"
+	xtime "github.com/m3db/m3/src/x/time"
+	"github.com/stretchr/testify/require"
+	"github.com/uber-go/tally"
+	"go.uber.org/zap"
+)
+
+func TestReadAggregateWrite(t *testing.T) {
+	var (
+		blockSize      = 2 * time.Hour
+		indexBlockSize = 2 * blockSize
+		rOpts          = retention.NewOptions().SetRetentionPeriod(24 * blockSize).SetBlockSize(blockSize)
+		idxOpts        = namespace.NewIndexOptions().SetEnabled(true).SetBlockSize(indexBlockSize)
+		nsOpts         = namespace.NewOptions().
+				SetRetentionOptions(rOpts).
+				SetIndexOptions(idxOpts).
+				SetColdWritesEnabled(true)
+	)
+
+	srcNs, err := namespace.NewMetadata(testNamespaces[0], nsOpts)
+	require.NoError(t, err)
+	trgNs, err := namespace.NewMetadata(testNamespaces[1], nsOpts)
+	require.NoError(t, err)
+
+	testOpts := NewTestOptions(t).
+		SetNamespaces([]namespace.Metadata{srcNs, trgNs}).
+		SetWriteNewSeriesAsync(true)
+
+	testSetup := newTestSetupWithCommitLogAndFilesystemBootstrapper(t, testOpts)
+	defer testSetup.Close()
+
+	reporter := xmetrics.NewTestStatsReporter(xmetrics.NewTestStatsReporterOptions())
+	scope, closer := tally.NewRootScope(
+		tally.ScopeOptions{Reporter: reporter}, time.Millisecond)
+	defer closer.Close()
+	testSetup.SetStorageOpts(testSetup.StorageOpts().SetInstrumentOptions(
+		instrument.NewOptions().SetMetricsScope(scope)))
+
+	storageOpts := testSetup.StorageOpts()
+	testSetup.SetStorageOpts(storageOpts)
+
+	// Start the server.
+	log := storageOpts.InstrumentOptions().Logger()
+	require.NoError(t, testSetup.StartServer())
+
+	// Stop the server.
+	defer func() {
+		require.NoError(t, testSetup.StopServer())
+		log.Debug("server is now down")
+	}()
+
+	start := time.Now()
+	session, err := testSetup.M3DBClient().DefaultSession()
+	require.NoError(t, err)
+	nowFn := testSetup.NowFn()
+
+	tags := []ident.Tag{
+		ident.StringTag("__name__", "cpu"),
+		ident.StringTag("job", "job1"),
+	}
+
+	dpTimeStart := nowFn().Truncate(indexBlockSize).Add(-3 * indexBlockSize)
+	dpTime := dpTimeStart
+
+	// Write test data.
+	for a := 0.0; a < 20.0; a++ {
+		err = session.WriteTagged(srcNs.ID(), ident.StringID("foo"), ident.NewTagsIterator(ident.NewTags(tags...)), dpTime, 42.1+a, xtime.Second, nil)
+		require.NoError(t, err)
+		dpTime = dpTime.Add(10 * time.Minute)
+	}
+	log.Info("test data written", zap.Duration("took", time.Since(start)))
+
+	log.Info("waiting till data is cold flushed")
+	start = time.Now()
+	expectedNumWrites := int64(20)
+	flushed := xclock.WaitUntil(func() bool {
+		counters := reporter.Counters()
+		counter, ok := counters["database.series.cold-writes"]     // Wait until data is written
+		warmData, ok := counters["database.flushWarmData.success"] // Wait until data is flushed
+		return ok && counter == expectedNumWrites && warmData >= expectedNumWrites
+	}, time.Minute)
+	require.True(t, flushed)
+	log.Info("verified data has been cold flushed", zap.Duration("took", time.Since(start)))
+
+	aggOpts := storage.AggregateTilesOptions{
+		Start: dpTimeStart,
+		End:   time.Now(),
+		Step:  time.Hour,
+	}
+
+	// Retry aggregation as persist manager could be still locked by cold writes.
+	// TODO: Remove retry when a separate persist manager will be implemented.
+	for retries := 0; retries < 10; retries++ {
+		err = testSetup.DB().AggregateTiles(storageOpts.ContextPool().Get(), srcNs.ID(), trgNs.ID(), aggOpts)
+		if err == nil {
+			break
+		}
+		time.Sleep(time.Second)
+	}
+	require.NoError(t, err)
+
+	log.Info("fetching aggregated data")
+	series, err := session.Fetch(trgNs.ID(), ident.StringID("foo"), dpTimeStart, nowFn())
+	require.NoError(t, err)
+
+	expectedDps := make(map[int64]float64)
+	// TODO: Replace with exact values when aggregation will be implemented.
+	timestamp := dpTimeStart
+	// TODO: now we aggregate only a single block, that's why we do expect
+	// 12 items in place of 20
+	for a := 0; a < 12; a++ {
+		expectedDps[timestamp.Unix()] = 42.1 + float64(a)
+		timestamp = timestamp.Add(10 * time.Minute)
+	}
+
+	count := 0
+	for series.Next() {
+		dp, _, _ := series.Current()
+		value, ok := expectedDps[dp.Timestamp.Unix()]
+		require.True(t, ok,
+			"didn't expect to find timestamp %v in aggregated result",
+			dp.Timestamp.Unix())
+		require.Equal(t, value, dp.Value,
+			"value for timestamp %v doesn't match. Expected %v but got %v",
+			dp.Timestamp.Unix(), value, dp.Value)
+		count++
+	}
+	require.Equal(t, len(expectedDps), count)
+}