tests: add multilevel cache test

Signed-off-by: Damian Raczkowski <damian.raczkowski@intel.com>

test/functional/tests/volumes/test_multilevel_cache_3.py

@@ -0,0 +1,74 @@
+#
+# Copyright(c) 2022 Intel Corporation
+# SPDX-License-Identifier: BSD-3-Clause
+#
+
+
+import pytest
+from storage_devices.disk import DiskType, DiskTypeSet, DiskTypeLowerThan
+from core.test_run import TestRun
+from api.cas.cache import CacheMode, casadm
+from test_utils.size import Size, Unit
+from test_tools.disk_utils import Filesystem
+from .common import create_files_with_md5sums, compare_md5sums
+
+mount_point = "/mnt/test"
+
+
+@pytest.mark.require_disk("cache_1", DiskTypeSet([DiskType.optane, DiskType.nand]))
+@pytest.mark.require_disk("cache_2", DiskTypeSet([DiskType.optane, DiskType.nand]))
+@pytest.mark.require_disk("core_1", DiskTypeLowerThan("cache_1"))
+@pytest.mark.require_disk("cache_3", DiskTypeSet([DiskType.hdd]))
+def test_multilevel_cache_3():
+    """
+    title:
+      Test multilevel cache.
+    description:
+      CAS Linux is able to use 3-level cache in different cache mode and remove it gracefully.
+    pass_criteria:
+      - Succesfully created 3-level cache.
+      - Succesfully mounted filesystem on CAS device.
+      - md5 sums are correct.
+    """
+    with TestRun.step("Prepare devices"):
+        core_dev_1 = TestRun.disks["core_1"]
+
+        cache_hdd = TestRun.disks["cache_3"]
+        cache_hdd.create_partitions([Size(3.2, Unit.GibiByte)])
+        cache_hdd = cache_hdd.partitions[0]
+
+        cache_dev_1 = TestRun.disks["cache_1"]
+        cache_dev_1.create_partitions([Size(3.2, Unit.GibiByte)])
+        cache_dev_1 = cache_dev_1.partitions[0]
+
+        cache_dev_2 = TestRun.disks["cache_2"]
+        cache_dev_2.create_partitions([Size(3.2, Unit.GibiByte)])
+        cache_dev_2 = cache_dev_2.partitions[0]
+
+    with TestRun.step("Create cache in WT mode and add core to it"):
+        cache_WT = casadm.start_cache(cache_dev=cache_dev_1, cache_mode=CacheMode.WT)
+        core_WT = cache_WT.add_core(core_dev=core_dev_1)
+
+    with TestRun.step("Create second layer cache in WB mode"):
+        cache_WB = casadm.start_cache(cache_dev=cache_dev_2, cache_mode=CacheMode.WB)
+
+    with TestRun.step("Add first CAS device by setting exported object as core to second layer"):
+        core_WB = cache_WB.add_core(core_WT)
+
+    with TestRun.step("Create third layer cache in WA mode"):
+        cache_WA = casadm.start_cache(cache_dev=cache_hdd, cache_mode=CacheMode.WA)
+
+    with TestRun.step("Add second CAS device by setting exported object as core to third layer"):
+        core = cache_WA.add_core(core_WB)
+
+    with TestRun.step("Create and mount filesystem on third CAS device"):
+        core.create_filesystem(Filesystem.ext3, blocksize=int(Size(1, Unit.Blocks4096)))
+        core.mount(mount_point)
+
+    with TestRun.step("Create files and copy them to mounted directory"):
+        md5_sums = create_files_with_md5sums(mount_point, 100)
+    with TestRun.step(
+        """Compare md5 susms between original files, files on IntelCAS device
+        and files copied from intelCAS device"""
+    ):
+        compare_md5sums(md5_sums, mount_point, copy_to_tmp=True)