diff --git a/test/functional/tests/volumes/test_raid_as_cache.py b/test/functional/tests/volumes/test_raid_as_cache.py
index 3c035cf..5999a2b 100644
--- a/test/functional/tests/volumes/test_raid_as_cache.py
+++ b/test/functional/tests/volumes/test_raid_as_cache.py
@@ -1,5 +1,5 @@
 #
-# Copyright(c) 2020 Intel Corporation
+# Copyright(c) 2020-2021 Intel Corporation
 # SPDX-License-Identifier: BSD-3-Clause-Clear
 #
 
@@ -8,17 +8,19 @@ import pytest
 from api.cas import casadm
 from api.cas.cache_config import CacheMode
 from core.test_run import TestRun
-from storage_devices.disk import DiskType, DiskTypeSet
+from storage_devices.disk import DiskType, DiskTypeSet, DiskTypeLowerThan
 from storage_devices.raid import Raid, RaidConfiguration, MetadataVariant, Level
 from test_tools import fs_utils
 from test_tools.disk_utils import Filesystem
 from test_utils.size import Size, Unit
 
 mount_point = "/mnt/test"
+mount_point2 = "/mnt/test2"
 test_file_path = f"{mount_point}/test_file"
 test_file_tmp_path = "/tmp/filetmp"
 test_file_size = Size(500, Unit.KiloByte)
-files_number = 100
+test_file_size_small = Size(1, Unit.KibiByte)
+number_of_files = 100
 
 
 @pytest.mark.parametrizex("cache_mode", CacheMode)
@@ -63,7 +65,7 @@ def test_raid_as_cache(cache_mode):
         core.mount(mount_point)
 
     with TestRun.step("Copy files to cache and check md5sum."):
-        for i in range(0, files_number):
+        for i in range(0, number_of_files):
             test_file = fs_utils.create_random_test_file(test_file_tmp_path, test_file_size)
             test_file_copied = test_file.copy(test_file_path, force=True)
 
@@ -74,3 +76,98 @@ def test_raid_as_cache(cache_mode):
             fs_utils.remove(test_file_copied.full_path, True)
 
         TestRun.LOGGER.info(f"Successful verification.")
+
+
+@pytest.mark.parametrize("cache_mode", CacheMode)
+@pytest.mark.require_disk("cache1", DiskTypeSet([DiskType.optane, DiskType.nand]))
+@pytest.mark.require_disk("cache2", DiskTypeSet([DiskType.optane, DiskType.nand]))
+@pytest.mark.require_disk("core1", DiskTypeLowerThan("cache1"))
+@pytest.mark.require_disk("core2", DiskTypeLowerThan("cache1"))
+def test_many_cores_raid_as_cache(cache_mode):
+    """
+        title: Test if CAS is working with many core devices using RAID0 as cache device.
+        description: |
+          Test if CAS is working properly with many core devices using RAID0 as cache device
+           and verification of data integrity of files copied to cores.
+        pass_criteria:
+          - No system crash.
+          - Successful creation of RAID0 and using it as cache for CAS device
+          - Successful addition of first and second core to CAS device
+          - Successful creation and copy files to each core and verification of theirs md5sum.
+    """
+    with TestRun.step("Create cache with RAID0 as caching device."):
+        raid_disk = TestRun.disks['cache1']
+        raid_disk.create_partitions([Size(2, Unit.GibiByte)])
+        raid_disk_1 = raid_disk.partitions[0]
+        raid_disk2 = TestRun.disks['cache2']
+        raid_disk2.create_partitions([Size(2, Unit.GibiByte)])
+        raid_disk_2 = raid_disk2.partitions[0]
+
+        config = RaidConfiguration(
+            level=Level.Raid0,
+            metadata=MetadataVariant.Legacy,
+            number_of_devices=2,
+            size=Size(1, Unit.GiB))
+
+        raid_volume = Raid.create(config, [raid_disk_1, raid_disk_2])
+        TestRun.LOGGER.info(f"RAID created successfully.")
+
+        cache = casadm.start_cache(raid_volume, cache_mode, force=True)
+
+    with TestRun.step("Add core device to cache, create filesystem and mount it."):
+        core_disk1 = TestRun.disks['core1']
+        core_disk1.create_partitions([Size(2, Unit.GibiByte)])
+        core_dev1 = core_disk1.partitions[0]
+
+        core1 = cache.add_core(core_dev1)
+        core1.create_filesystem(Filesystem.ext3)
+        core1.mount(mount_point)
+
+    with TestRun.step("Add second core device to cache, create filesystem and mount it."):
+        core_disk2 = TestRun.disks['core2']
+        core_disk2.create_partitions([Size(2, Unit.GibiByte)])
+        core_dev2 = core_disk2.partitions[0]
+
+        core2 = cache.add_core(core_dev2)
+        core2.create_filesystem(Filesystem.ext3)
+        core2.mount(mount_point2)
+
+    with TestRun.step("Create files with checksum on first core."):
+        core1_md5sums = create_files_with_md5sums(mount_point, number_of_files)
+
+    with TestRun.step("Create files with checksum on second core."):
+        core2_md5sums = create_files_with_md5sums(mount_point2, number_of_files)
+
+    with TestRun.step("Compare checksum on first core."):
+        compare_md5sums(core1_md5sums, mount_point)
+
+    with TestRun.step("Compare checksum on second core."):
+        compare_md5sums(core2_md5sums, mount_point2)
+
+
+def create_files_with_md5sums(destination_path, files_count):
+    md5sums = list()
+    for i in range(0, files_count):
+        temp_file = f"/tmp/file{i}"
+        destination_file = f"{destination_path}/file{i}"
+
+        test_file = fs_utils.create_random_test_file(temp_file, test_file_size)
+        test_file.copy(destination_file, force=True)
+
+        md5sums.append(test_file.md5sum())
+
+    TestRun.LOGGER.info(f"Files created and copied to core successfully.")
+    return md5sums
+
+
+def compare_md5sums(md5_sums_source, files_to_check_path):
+    md5_sums_elements = len(md5_sums_source)
+
+    for i in range(md5_sums_elements):
+        file_to_check_path = f"{files_to_check_path}/file{i}"
+        file_to_check = fs_utils.parse_ls_output(fs_utils.ls_item(file_to_check_path))[0]
+
+        if md5_sums_source[i] != file_to_check.md5sum():
+            TestRun.fail(f"Source and target files {file_to_check_path} checksums are different.")
+
+    TestRun.LOGGER.info(f"Successful verification, md5sums match.")