diff --git a/test/functional/test-framework b/test/functional/test-framework
index 42ebe34da..acedafb5a 160000
--- a/test/functional/test-framework
+++ b/test/functional/test-framework
@@ -1 +1 @@
-Subproject commit 42ebe34da3e6e10f823c24db7954675978298fe0
+Subproject commit acedafb5afec1ff346d97aa9db5486caf8acc032
diff --git a/test/functional/tests/lazy_writes/test_flush_huge_dirty_data.py b/test/functional/tests/lazy_writes/test_flush_huge_dirty_data.py
index 59d3794fd..5dfd3eeee 100644
--- a/test/functional/tests/lazy_writes/test_flush_huge_dirty_data.py
+++ b/test/functional/tests/lazy_writes/test_flush_huge_dirty_data.py
@@ -1,5 +1,6 @@
 #
 # Copyright(c) 2020-2021 Intel Corporation
+# Copyright(c) 2024 Huawei Technologies
 # SPDX-License-Identifier: BSD-3-Clause
 #
 
@@ -28,6 +29,7 @@
 
 @pytest.mark.parametrizex("fs", Filesystem)
 @pytest.mark.parametrizex("cache_mode", CacheMode.with_traits(CacheModeTrait.LazyWrites))
+@pytest.mark.require_disk("separate_dev", DiskTypeSet([DiskType.optane, DiskType.nand]))
 @pytest.mark.require_disk("cache", DiskTypeSet([DiskType.optane, DiskType.nand]))
 @pytest.mark.require_disk("core", DiskTypeLowerThan("cache"))
 def test_flush_over_640_gibibytes_with_fs(cache_mode, fs):
@@ -39,6 +41,8 @@ def test_flush_over_640_gibibytes_with_fs(cache_mode, fs):
           - Flushing completes successfully without any errors.
     """
     with TestRun.step("Prepare devices for cache and core."):
+        separate_dev = TestRun.disks['separate_dev']
+        check_disk_size(separate_dev)
         cache_dev = TestRun.disks['cache']
         check_disk_size(cache_dev)
         cache_dev.create_partitions([required_disk_size])
@@ -59,8 +63,12 @@ def test_flush_over_640_gibibytes_with_fs(cache_mode, fs):
         cache.set_cleaning_policy(CleaningPolicy.nop)
         cache.set_seq_cutoff_policy(SeqCutOffPolicy.never)
 
-    with TestRun.step("Create test file"):
-        test_file_main = File.create_file("/tmp/test_file_main")
+    with TestRun.step("Create a test file on a separate disk"):
+        src_dir_path = "/mnt/flush_640G_test"
+        separate_dev.create_filesystem(fs)
+        separate_dev.mount(src_dir_path)
+
+        test_file_main = File.create_file(f"{src_dir_path}/test_file_main")
         fio = (
             Fio().create_command()
             .io_engine(IoEngine.libaio)
@@ -75,31 +83,37 @@ def test_flush_over_640_gibibytes_with_fs(cache_mode, fs):
         fio.run()
         test_file_main.refresh_item()
 
-    with TestRun.step("Validate test file and read its md5 sum."):
+    with TestRun.step("Validate test file and read its crc32 sum."):
         if test_file_main.size != file_size:
-            TestRun.fail("Created test file hasn't reached its target size.")
-        test_file_md5sum_main = test_file_main.md5sum()
+            TestRun.LOGGER.error(f"Expected test file size {file_size}. Got {test_file_main.size}")
+        test_file_crc32sum_main = test_file_main.crc32sum(timeout=timedelta(hours=4))
 
     with TestRun.step("Write data to exported object."):
-        test_file_copy = test_file_main.copy(mnt_point + "test_file_copy")
+        test_file_copy = test_file_main.copy(
+            mnt_point + "test_file_copy", timeout=timedelta(hours=4)
+        )
         test_file_copy.refresh_item()
         sync()
 
     with TestRun.step(f"Check if dirty data exceeded {file_size * 0.98} GiB."):
         minimum_4KiB_blocks = int((file_size * 0.98).get_value(Unit.Blocks4096))
-        if int(cache.get_statistics().usage_stats.dirty) < minimum_4KiB_blocks:
-            TestRun.fail("There is not enough dirty data in the cache!")
+        actual_dirty_blocks = int(cache.get_statistics().usage_stats.dirty)
+        if actual_dirty_blocks < minimum_4KiB_blocks:
+            TestRun.LOGGER.error(
+                f"Expected at least: {minimum_4KiB_blocks} dirty blocks."
+                f"Got {actual_dirty_blocks}"
+            )
 
     with TestRun.step("Unmount core and stop cache with flush."):
         core.unmount()
-        # this operation could take few hours, depending on core disk
+        # this operation could take a few hours, depending on the core disk
         output = TestRun.executor.run(stop_cmd(str(cache.cache_id)), timedelta(hours=12))
         if output.exit_code != 0:
             TestRun.fail(f"Stopping cache with flush failed!\n{output.stderr}")
 
-    with TestRun.step("Mount core device and check md5 sum of test file copy."):
+    with TestRun.step("Mount core device and check crc32 sum of test file copy."):
         core_dev.mount(mnt_point)
-        if test_file_md5sum_main != test_file_copy.md5sum():
+        if test_file_crc32sum_main != test_file_copy.crc32sum(timeout=timedelta(hours=4)):
             TestRun.LOGGER.error("Md5 sums should be equal.")
 
     with TestRun.step("Delete test files."):
@@ -110,6 +124,10 @@ def test_flush_over_640_gibibytes_with_fs(cache_mode, fs):
         core_dev.unmount()
         remove(mnt_point, True, True, True)
 
+    with TestRun.step("Unmount the additional device."):
+        separate_dev.unmount()
+        remove(src_dir_path, True, True, True)
+
 
 @pytest.mark.parametrizex("cache_mode", CacheMode.with_traits(CacheModeTrait.LazyWrites))
 @pytest.mark.require_disk("cache", DiskTypeSet([DiskType.optane, DiskType.nand]))