diff --git a/tests/functional/tests/engine/test_large_io.py b/tests/functional/tests/engine/test_large_io.py
new file mode 100644
index 0000000..d6c0ba1
--- /dev/null
+++ b/tests/functional/tests/engine/test_large_io.py
@@ -0,0 +1,87 @@
+#
+# Copyright(c) 2022 Intel Corporation
+# SPDX-License-Identifier: BSD-3-Clause
+#
+
+from ctypes import c_int
+
+from pyocf.types.cache import Cache
+from pyocf.types.data import Data
+from pyocf.types.core import Core
+from pyocf.types.io import IoDir
+from pyocf.types.volume import RamVolume, IoFlags
+from pyocf.types.volume_core import CoreVolume
+from pyocf.utils import Size
+from pyocf.types.shared import OcfCompletion
+
+
+def test_large_flush(pyocf_ctx):
+    cache_device = RamVolume(Size.from_MiB(50))
+    core_device = RamVolume(Size.from_MiB(100))
+
+    cache = Cache.start_on_device(cache_device)
+    core = Core.using_device(core_device)
+    cache.add_core(core)
+
+    queue = cache.get_default_queue()
+    vol = CoreVolume(core, open=True)
+
+    io = vol.new_io(queue, 0, core_device.size.bytes, IoDir.WRITE, 0, IoFlags.FLUSH)
+    completion = OcfCompletion([("err", c_int)])
+    io.callback = completion.callback
+    data = Data(byte_count=0)
+    io.set_data(data, 0)
+    io.submit_flush()
+    completion.wait()
+
+    assert int(completion.results["err"]) == 0
+
+    cache.stop()
+
+
+def test_large_discard(pyocf_ctx):
+    cache_device = RamVolume(Size.from_MiB(50))
+    core_device = RamVolume(Size.from_MiB(100))
+
+    cache = Cache.start_on_device(cache_device)
+    core = Core.using_device(core_device)
+    cache.add_core(core)
+
+    queue = cache.get_default_queue()
+    vol = CoreVolume(core, open=True)
+
+    io = vol.new_io(queue, 0, core_device.size.bytes, IoDir.WRITE, 0, 0)
+    completion = OcfCompletion([("err", c_int)])
+    io.callback = completion.callback
+    data = Data(byte_count=0)
+    io.set_data(data, 0)
+    io.submit_discard()
+    completion.wait()
+
+    assert int(completion.results["err"]) == 0
+
+    cache.stop()
+
+
+def test_large_io(pyocf_ctx):
+    cache_device = RamVolume(Size.from_MiB(50))
+    core_device = RamVolume(Size.from_MiB(100))
+
+    cache = Cache.start_on_device(cache_device)
+    core = Core.using_device(core_device)
+    cache.add_core(core)
+
+    queue = cache.get_default_queue()
+    vol = CoreVolume(core, open=True)
+
+    io = vol.new_io(queue, 0, core_device.size.bytes, IoDir.WRITE, 0, 0)
+    completion = OcfCompletion([("err", c_int)])
+    io.callback = completion.callback
+    data = Data(byte_count=core_device.size.bytes)
+    io.set_data(data)
+    io.submit()
+    completion.wait()
+
+    assert int(completion.results["err"]) == 0
+
+    cache.stop()