Merge pull request #309 from Deixx/ioclass-stats

IO class stats - refactor and test for statistics sections

test/functional/api/cas/cli_messages.py

@@ -33,6 +33,14 @@ stop_cache_incomplete = [
     r"Cache is in incomplete state - at least one core is inactive"
 ]
 
+get_stats_ioclass_id_not_configured = [
+    r"IO class \d+ is not configured\."
+]
+
+get_stats_ioclass_id_out_of_range = [
+    r"Invalid IO class id, must be in the range 0-32\."
+]
+
 remove_multilevel_core = [
     r"Error while removing core device \d+ from cache instance \d+",
     r"Device opens or mount are pending to this cache"
@@ -52,9 +60,19 @@ stop_cache_mounted_core = [
 ]
 
 
-def check_msg(output: Output, expected_messages):
+def check_stderr_msg(output: Output, expected_messages):
-    result = '\n'.join([output.stdout, output.stderr])
+    return __check_string_msg(output.stderr, expected_messages)
+
+
+def check_stdout_msg(output: Output, expected_messages):
+    return __check_string_msg(output.stdout, expected_messages)
+
+
+def __check_string_msg(text: str, expected_messages):
+    msg_ok = True
     for msg in expected_messages:
-        matches = re.search(msg, result)
+        matches = re.search(msg, text)
         if not matches:
-            TestRun.LOGGER.error(f"Message is incorrect, expected: {msg}\n actual: {result}.")
+            TestRun.LOGGER.error(f"Message is incorrect, expected: {msg}\n actual: {text}.")
+            msg_ok = False
+    return msg_ok

test/functional/tests/fault_injection/test_fault_injection_opencas_load.py

@@ -2,14 +2,13 @@
 # Copyright(c) 2020 Intel Corporation
 # SPDX-License-Identifier: BSD-3-Clause-Clear
 #
-from time import sleep
 
 import pytest
 
 from api.cas import casadm, casadm_parser, cli, cli_messages
 from api.cas.cache_config import CacheMode, CleaningPolicy, CacheModeTrait
-from storage_devices.disk import DiskType, DiskTypeSet, DiskTypeLowerThan
 from core.test_run import TestRun
+from storage_devices.disk import DiskType, DiskTypeSet, DiskTypeLowerThan
 from test_tools import fs_utils
 from test_tools.dd import Dd
 from test_tools.disk_utils import Filesystem
@@ -69,7 +68,7 @@ def test_stop_no_flush_load_cache(cache_mode, filesystem):
         output = TestRun.executor.run_expect_fail(cli.start_cmd(
             cache_dev=str(cache_part.system_path), cache_mode=str(cache_mode.name.lower()),
             force=False, load=False))
-        cli_messages.check_msg(output, cli_messages.start_cache_with_existing_metadata)
+        cli_messages.check_stderr_msg(output, cli_messages.start_cache_with_existing_metadata)
 
     with TestRun.step("Load cache."):
         cache = casadm.load_cache(cache.cache_device)
@@ -146,7 +145,7 @@ def test_stop_no_flush_load_cache_no_fs(cache_mode):
         output = TestRun.executor.run_expect_fail(cli.start_cmd(
             cache_dev=str(cache_part.system_path), cache_mode=str(cache_mode.name.lower()),
             force=False, load=False))
-        cli_messages.check_msg(output, cli_messages.start_cache_with_existing_metadata)
+        cli_messages.check_stderr_msg(output, cli_messages.start_cache_with_existing_metadata)
 
     with TestRun.step("Load cache."):
         cache = casadm.load_cache(cache.cache_device)

test/functional/tests/fault_injection/test_fault_injection_with_mounted_core.py

@@ -7,8 +7,8 @@ import pytest
 
 from api.cas import casadm, casadm_parser, cli, cli_messages
 from api.cas.cache_config import CacheMode
-from storage_devices.disk import DiskType, DiskTypeSet, DiskTypeLowerThan
 from core.test_run import TestRun
+from storage_devices.disk import DiskType, DiskTypeSet, DiskTypeLowerThan
 from test_tools import fs_utils
 from test_tools.disk_utils import Filesystem
 from test_utils.size import Size, Unit
@@ -109,11 +109,11 @@ def test_stop_cache_with_mounted_partition(cache_mode):
     with TestRun.step("Try to remove core from cache."):
         output = TestRun.executor.run_expect_fail(cli.remove_core_cmd(cache_id=str(cache.cache_id),
                                                                       core_id=str(core.core_id)))
-        cli_messages.check_msg(output, cli_messages.remove_mounted_core)
+        cli_messages.check_stderr_msg(output, cli_messages.remove_mounted_core)
 
     with TestRun.step("Try to stop CAS."):
         output = TestRun.executor.run_expect_fail(cli.stop_cmd(cache_id=str(cache.cache_id)))
-        cli_messages.check_msg(output, cli_messages.stop_cache_mounted_core)
+        cli_messages.check_stderr_msg(output, cli_messages.stop_cache_mounted_core)
 
     with TestRun.step("Unmount core device."):
         core.unmount()
@@ -158,12 +158,12 @@ def test_add_cached_core(cache_mode):
         output = TestRun.executor.run_expect_fail(
             cli.add_core_cmd(cache_id=str(cache2.cache_id), core_dev=str(core_part.system_path),
                              core_id=str(core.core_id)))
-        cli_messages.check_msg(output, cli_messages.add_cached_core)
+        cli_messages.check_stderr_msg(output, cli_messages.add_cached_core)
 
     with TestRun.step("Try adding the same core device to the same cache for the second time."):
         output = TestRun.executor.run_expect_fail(
             cli.add_core_cmd(cache_id=str(cache1.cache_id), core_dev=str(core_part.system_path)))
-        cli_messages.check_msg(output, cli_messages.add_cached_core)
+        cli_messages.check_stderr_msg(output, cli_messages.add_cached_core)
 
     with TestRun.step("Stop caches."):
         casadm.stop_all_caches()

test/functional/tests/fault_injection/test_multilevel_cache.py

@@ -6,8 +6,8 @@
 import pytest
 
 from api.cas import casadm, cli, cli_messages
-from storage_devices.disk import DiskType, DiskTypeSet, DiskTypeLowerThan
 from core.test_run import TestRun
+from storage_devices.disk import DiskType, DiskTypeSet, DiskTypeLowerThan
 from test_utils.size import Size, Unit
 
 
@@ -49,7 +49,7 @@ def test_remove_multilevel_core():
         output = TestRun.executor.run_expect_fail(cli.remove_core_cmd(cache_id=str(cache1.cache_id),
                                                                       core_id=str(core1.core_id),
                                                                       force=True))
-        cli_messages.check_msg(output, cli_messages.remove_multilevel_core)
+        cli_messages.check_stderr_msg(output, cli_messages.remove_multilevel_core)
 
     with TestRun.step("Stop cache."):
         casadm.stop_all_caches()

test/functional/tests/incremental_load/test_incremental_load.py

@@ -1,16 +1,18 @@
 #
-# Copyright(c) 2019 Intel Corporation
+# Copyright(c) 2019-2020 Intel Corporation
 # SPDX-License-Identifier: BSD-3-Clause-Clear
 #
 
+import time
 from datetime import timedelta
 from random import shuffle
 
 import pytest
-import time
+
-from api.cas import casadm, init_config, cli, cli_messages
+from api.cas import casadm, cli, cli_messages
 from api.cas.cache_config import CacheStatus, SeqCutOffPolicy
 from api.cas.core import CoreStatus, CacheMode, CleaningPolicy, FlushParametersAlru, File
+from api.cas.init_config import InitConfig
 from api.cas.statistics import CacheStats
 from core.test_run import TestRun
 from storage_devices.disk import DiskTypeSet, DiskType, DiskTypeLowerThan
@@ -47,7 +49,7 @@ def test_attach_core_to_incomplete_cache_volume():
         cache = casadm.start_cache(cache_dev, force=True)
         core = cache.add_core(core_dev)
     with TestRun.step("Create init config file using current CAS configuration."):
-        init_config.create_init_config_from_running_configuration()
+        InitConfig.create_init_config_from_running_configuration()
     with TestRun.step("Stop cache."):
         cache.stop()
     with TestRun.step("Load cache."):
@@ -106,7 +108,7 @@ def test_flush_inactive_devices():
         first_core = cache.add_core(first_core_dev)
         second_core = cache.add_core(second_core_dev)
     with TestRun.step("Create init config file using running CAS configuration."):
-        init_config.create_init_config_from_running_configuration()
+        InitConfig.create_init_config_from_running_configuration()
     with TestRun.step("Run random writes to CAS device."):
         run_fio([first_core.system_path, second_core.system_path])
     with TestRun.step("Stop cache without flushing dirty data."):
@@ -180,7 +182,7 @@ def test_list_cache_and_cache_volumes():
         if cache_status != CacheStatus.running:
             TestRun.fail(f"Cache should be in running state. Actual state: {cache_status}")
     with TestRun.step("Create init config file using current CAS configuration."):
-        init_config.create_init_config_from_running_configuration()
+        InitConfig.create_init_config_from_running_configuration()
     with TestRun.step("Stop cache."):
         cache.stop()
     with TestRun.step("Unplug core device."):
@@ -226,14 +228,14 @@ def test_load_cache_with_inactive_core():
         cache = casadm.start_cache(cache_dev, force=True)
         core = cache.add_core(core_dev)
     with TestRun.step("Create init config file using current CAS configuration."):
-        init_config.create_init_config_from_running_configuration()
+        InitConfig.create_init_config_from_running_configuration()
     with TestRun.step("Stop cache."):
         cache.stop()
     with TestRun.step("Unplug core device."):
         plug_device.unplug()
     with TestRun.step("Load cache."):
         output = TestRun.executor.run(cli.load_cmd(cache_dev.system_path))
-        cli_messages.check_msg(output, cli_messages.load_inactive_core_missing)
+        cli_messages.check_stderr_msg(output, cli_messages.load_inactive_core_missing)
     with TestRun.step("Plug missing device and stop cache."):
         plug_device.plug()
         core.wait_for_status_change(CoreStatus.active)
@@ -267,7 +269,7 @@ def test_preserve_data_for_inactive_device():
         cache.set_cleaning_policy(CleaningPolicy.nop)
         core = cache.add_core(core_dev)
     with TestRun.step("Create init config file using current CAS configuration."):
-        init_config.create_init_config_from_running_configuration()
+        InitConfig.create_init_config_from_running_configuration()
     with TestRun.step("Create filesystem on CAS device and mount it."):
         core.create_filesystem(Filesystem.ext3)
         core.mount(mount_dir)
@@ -361,7 +363,7 @@ def test_print_statistics_inactive(cache_mode):
         first_core = cache.add_core(first_core_dev)
         second_core = cache.add_core(second_core_dev)
     with TestRun.step("Create init config file using current CAS configuration."):
-        init_config.create_init_config_from_running_configuration()
+        InitConfig.create_init_config_from_running_configuration()
     with TestRun.step("Run IO."):
         run_fio([first_core.system_path, second_core.system_path])
     with TestRun.step("Print statistics and check if there is no inactive usage section."):
@@ -448,7 +450,7 @@ def test_remove_detached_cores():
         for d in core_devs:
             cores.append(cache.add_core(d))
     with TestRun.step("Create init config file using current CAS configuration."):
-        init_config.create_init_config_from_running_configuration()
+        InitConfig.create_init_config_from_running_configuration()
     with TestRun.step("Run random writes to all CAS devices."):
         run_fio([c.system_path for c in cores])
     with TestRun.step("Flush dirty data from two CAS devices and verify than other two contain "
@@ -507,7 +509,7 @@ def test_remove_inactive_devices():
         for d in core_devs:
             cores.append(cache.add_core(d))
     with TestRun.step("Create init config file using current CAS configuration."):
-        init_config.create_init_config_from_running_configuration()
+        InitConfig.create_init_config_from_running_configuration()
     with TestRun.step("Run random writes to all CAS devices."):
         run_fio([c.system_path for c in cores])
     with TestRun.step("Flush dirty data from two CAS devices and verify than other two "
@@ -549,7 +551,7 @@ def test_remove_inactive_devices():
                                  "command returned an error.")
                 TestRun.LOGGER.info("Remove operation without force option is blocked for "
                                     "dirty CAS device as expected.")
-                cli_messages.check_msg(e.output, cli_messages.remove_inactive_core)
+                cli_messages.check_stderr_msg(e.output, cli_messages.remove_inactive_core)
                 output = casadm.list_caches().stdout
                 if core.system_path not in output:
                     TestRun.fail(f"CAS device is not listed in casadm list output but it should be."
@@ -582,7 +584,7 @@ def test_stop_cache_with_inactive_devices():
         cache = casadm.start_cache(cache_dev, cache_mode=CacheMode.WB, force=True)
         core = cache.add_core(core_dev)
     with TestRun.step("Create init config file using current CAS configuration."):
-        init_config.create_init_config_from_running_configuration()
+        InitConfig.create_init_config_from_running_configuration()
     with TestRun.step("Run random writes and verify that CAS device contains dirty data."):
         run_fio([core.system_path])
         if core.get_dirty_blocks() == Size.zero():
@@ -629,7 +631,7 @@ def try_stop_incomplete_cache(cache):
         cache.stop()
     except CmdException as e:
         TestRun.LOGGER.info("Stopping cache without 'no data flush' option is blocked as expected.")
-        cli_messages.check_msg(e.output, cli_messages.stop_cache_incomplete)
+        cli_messages.check_stderr_msg(e.output, cli_messages.stop_cache_incomplete)
 
 
 def check_inactive_usage_stats(stats_before, stats_after, stat_name, should_be_zero):

test/functional/tests/stats/test_ioclass_stats.py

@@ -1,111 +1,157 @@
 #
-# Copyright(c) 2019 Intel Corporation
+# Copyright(c) 2019-2020 Intel Corporation
 # SPDX-License-Identifier: BSD-3-Clause-Clear
 #
-
+import random
 
 import pytest
 
 from api.cas import casadm
-from api.cas import casadm_parser
 from api.cas import ioclass_config
-from api.cas.cache_config import CleaningPolicy
+from api.cas.cache_config import CleaningPolicy, CacheMode, CacheLineSize
 from api.cas.casadm import StatsFilter
+from api.cas.cli_messages import (
+    check_stderr_msg,
+    get_stats_ioclass_id_not_configured,
+    get_stats_ioclass_id_out_of_range
+)
+from api.cas.statistics import (
+    config_stats_ioclass, usage_stats, request_stats, block_stats_core, block_stats_cache
+)
 from core.test_run import TestRun
 from storage_devices.disk import DiskType, DiskTypeSet, DiskTypeLowerThan
 from test_tools.disk_utils import Filesystem
 from test_utils.filesystem.file import File
 from test_utils.os_utils import sync, Udev
+from test_utils.output import CmdException
 from test_utils.size import Size, Unit
 
-ioclass_config_path = "/tmp/opencas_ioclass.conf"
+IoClass = ioclass_config.IoClass
+
 mountpoint = "/tmp/cas1-1"
 cache_id = 1
 
 
 @pytest.mark.require_disk("cache", DiskTypeSet([DiskType.optane, DiskType.nand]))
 @pytest.mark.require_disk("core", DiskTypeLowerThan("cache"))
-def test_ioclass_stats_set():
+@pytest.mark.parametrize("random_cls", [random.choice(list(CacheLineSize))])
-    """Try to retrieve stats for all set ioclasses"""
+def test_ioclass_stats_basic(random_cls):
-    prepare()
+    """
-    min_ioclass_id = 1
+        title: Basic test for retrieving IO class statistics.
-    max_ioclass_id = 11
+        description: |
+          Check if statistics are retrieved only for configured IO classes.
+        pass_criteria:
+          - Statistics are retrieved for configured IO classes.
+          - Error is displayed when retrieving statistics for non-configured IO class.
+          - Error is displayed when retrieving statistics for out of range IO class id.
+    """
 
-    ioclass_config.create_ioclass_config(
+    min_ioclass_id = 11
-        add_default_rule=True, ioclass_config_path=ioclass_config_path
+    max_ioclass_id = 21
-    )
 
-    TestRun.LOGGER.info("Preparing ioclass config file")
+    with TestRun.step("Test prepare"):
-    for i in range(min_ioclass_id, max_ioclass_id):
+        prepare(random_cls)
-        ioclass_config.add_ioclass(
-            ioclass_id=(i + 10),
-            eviction_priority=22,
-            allocation=True,
-            rule=f"file_size:le:{4096*i}&done",
-            ioclass_config_path=ioclass_config_path,
-        )
-    casadm.load_io_classes(cache_id, file=ioclass_config_path)
 
-    TestRun.LOGGER.info("Preparing ioclass config file")
+    with TestRun.step("Prepare IO class config file"):
-    for i in range(32):
+        ioclass_list = []
-        if i != 0 or i not in range(min_ioclass_id, max_ioclass_id):
+        for class_id in range(min_ioclass_id, max_ioclass_id):
-            with pytest.raises(Exception):
+            ioclass_list.append(IoClass(
-                assert casadm_parser.get_statistics(
+                class_id=class_id,
-                    cache_id=cache_id, io_class_id=True, filter=[StatsFilter.conf]
+                rule=f"file_size:le:{4096 * class_id}&done",
-                )
+                priority=22
+            ))
+        IoClass.save_list_to_config_file(ioclass_list, True)
+
+    with TestRun.step("Load IO class config file"):
+        casadm.load_io_classes(cache_id, file=ioclass_config.default_config_file_path)
+
+    with TestRun.step("Try retrieving IO class stats for all allowed id values "
+                      "and one out of range id"):
+        for class_id in range(ioclass_config.MAX_IO_CLASS_ID + 2):
+            out_of_range = " out of range" if class_id > ioclass_config.MAX_IO_CLASS_ID else ""
+            with TestRun.group(f"Checking{out_of_range} IO class id {class_id}..."):
+                expected = class_id == 0 or class_id in range(min_ioclass_id, max_ioclass_id)
+                try:
+                    casadm.print_statistics(
+                        cache_id=cache_id,
+                        io_class_id=class_id,
+                        per_io_class=True)
+                    if not expected:
+                        TestRun.LOGGER.error(
+                            f"Stats retrieved for not configured IO class {class_id}")
+                except CmdException as e:
+                    if expected:
+                        TestRun.LOGGER.error(f"Stats not retrieved for IO class id: {class_id}")
+                    elif class_id <= ioclass_config.MAX_IO_CLASS_ID:
+                        if not check_stderr_msg(e.output, get_stats_ioclass_id_not_configured):
+                            TestRun.LOGGER.error(
+                                f"Wrong message for unused IO class id: {class_id}")
+                    elif not check_stderr_msg(e.output, get_stats_ioclass_id_out_of_range):
+                        TestRun.LOGGER.error(
+                            f"Wrong message for out of range IO class id: {class_id}")
 
 
 @pytest.mark.require_disk("cache", DiskTypeSet([DiskType.optane, DiskType.nand]))
 @pytest.mark.require_disk("core", DiskTypeLowerThan("cache"))
-def test_ioclass_stats_sum():
+@pytest.mark.parametrize("random_cls", [random.choice(list(CacheLineSize))])
-    """Check if stats for all set ioclasses sum up to cache stats"""
+def test_ioclass_stats_sum(random_cls):
-    cache, core = prepare()
+    """
+        title: Test for sum of IO class statistics.
+        description: |
+          Check if statistics for configured IO classes sum up to cache/core statistics.
+        pass_criteria:
+          - Per class cache IO class statistics sum up to cache statistics.
+          - Per class core IO class statistics sum up to core statistics.
+    """
+
     min_ioclass_id = 1
     max_ioclass_id = 11
-    file_size_base = Unit.KibiByte.value * 4
+    file_size_base = Unit.Blocks4096.value
 
-    TestRun.LOGGER.info("Preparing ioclass config file")
+    with TestRun.step("Test prepare"):
-    ioclass_config.create_ioclass_config(
+        caches, cores = prepare(random_cls)
-        add_default_rule=True, ioclass_config_path=ioclass_config_path
+        cache, core = caches[0], cores[0]
-    )
-    for i in range(min_ioclass_id, max_ioclass_id):
-        ioclass_config.add_ioclass(
-            ioclass_id=i,
-            eviction_priority=22,
-            allocation=True,
-            rule=f"file_size:le:{file_size_base*i}&done",
-            ioclass_config_path=ioclass_config_path,
-        )
-    cache.load_io_class(ioclass_config_path)
 
-    TestRun.LOGGER.info("Generating files with particular sizes")
+    with TestRun.step("Prepare IO class config file"):
-    files_list = []
+        ioclass_list = []
-    for i in range(min_ioclass_id, max_ioclass_id):
+        for class_id in range(min_ioclass_id, max_ioclass_id):
-        path = f"/tmp/test_file_{file_size_base*i}"
+            ioclass_list.append(IoClass(
-        File.create_file(path)
+                class_id=class_id,
-        f = File(path)
+                rule=f"file_size:le:{file_size_base * class_id}&done",
-        f.padding(Size(file_size_base * i, Unit.Byte))
+                priority=22
-        files_list.append(f)
+            ))
+        IoClass.save_list_to_config_file(ioclass_list, True)
 
-    core.create_filesystem(Filesystem.ext4)
+    with TestRun.step("Load IO class config file"):
+        cache.load_io_class(ioclass_config.default_config_file_path)
 
-    cache.reset_counters()
+    with TestRun.step("Generate files with particular sizes in temporary folder"):
+        files_list = []
+        for class_id in range(min_ioclass_id, max_ioclass_id):
+            path = f"/tmp/test_file_{file_size_base * class_id}"
+            File.create_file(path)
+            f = File(path)
+            f.padding(Size(file_size_base * class_id, Unit.Byte))
+            files_list.append(f)
 
-    # Name of stats, which should not be compared
+    with TestRun.step("Copy files to mounted core"):
-    not_compare_stats = ["clean", "occupancy"]
-    ioclass_id_list = list(range(min_ioclass_id, max_ioclass_id))
-    # Append default ioclass id
-    ioclass_id_list.append(0)
-    TestRun.LOGGER.info("Copying files to mounted core and stats check")
-    for f in files_list:
-        # To prevent stats pollution by filesystem requests, umount core device
-        # after file is copied
         core.mount(mountpoint)
-        f.copy(mountpoint)
+        for f in files_list:
-        sync()
+            TestRun.LOGGER.info(f"Copying file {f.name} to mounted core")
+            f.copy(mountpoint)
+            sync()
+        # To prevent stats pollution by filesystem requests, umount core device
+        # after files are copied
         core.unmount()
         sync()
 
+    with TestRun.step("Check if per class cache IO class statistics sum up to cache statistics"):
+        # Name of stats, which should not be compared
+        not_compare_stats = ["clean", "occupancy"]
+        ioclass_id_list = list(range(min_ioclass_id, max_ioclass_id))
+        # Append default IO class id
+        ioclass_id_list.append(0)
+
         cache_stats = cache.get_statistics_flat(
             stat_filter=[StatsFilter.usage, StatsFilter.req, StatsFilter.blk]
         )
@@ -127,44 +173,158 @@ def test_ioclass_stats_sum():
                 if isinstance(cache_stats[stat_name], Size)
                 else cache_stats[stat_name]
             )
-            assert stat_val == 0, f"{stat_name} diverged!\n"
+            if stat_val != 0:
+                TestRun.LOGGER.error(f"{stat_name} diverged for cache!\n")
 
-    # Test cleanup
+    with TestRun.step("Check if per class core IO class statistics sum up to core statistics"):
-    for f in files_list:
+        core_stats = core.get_statistics_flat(
-        f.remove()
+            stat_filter=[StatsFilter.usage, StatsFilter.req, StatsFilter.blk]
+        )
+        for ioclass_id in ioclass_id_list:
+            ioclass_stats = core.get_statistics_flat(
+                stat_filter=[StatsFilter.usage, StatsFilter.req, StatsFilter.blk],
+                io_class_id=ioclass_id,
+            )
+            for stat_name in core_stats:
+                if stat_name in not_compare_stats:
+                    continue
+                core_stats[stat_name] -= ioclass_stats[stat_name]
+
+        for stat_name in core_stats:
+            if stat_name in not_compare_stats:
+                continue
+            stat_val = (
+                core_stats[stat_name].get_value()
+                if isinstance(core_stats[stat_name], Size)
+                else core_stats[stat_name]
+            )
+            if stat_val != 0:
+                TestRun.LOGGER.error(f"{stat_name} diverged for core!\n")
+
+        with TestRun.step("Test cleanup"):
+            for f in files_list:
+                f.remove()
 
 
-def flush_cache(cache_id):
+@pytest.mark.require_disk("cache", DiskTypeSet([DiskType.optane, DiskType.nand]))
-    casadm.flush(cache_id=cache_id)
+@pytest.mark.require_disk("core", DiskTypeLowerThan("cache"))
-    sync()
+@pytest.mark.parametrize("stat_filter", [StatsFilter.req, StatsFilter.usage, StatsFilter.conf,
-    casadm.reset_counters(cache_id=cache_id)
+                                         StatsFilter.blk])
-    stats = casadm_parser.get_statistics(cache_id=cache_id, filter=[StatsFilter.blk])
+@pytest.mark.parametrize("per_core", [True, False])
-    for key, value in stats.items():
+@pytest.mark.parametrize("random_cls", [random.choice(list(CacheLineSize))])
-        assert value.get_value(Unit.Blocks4096) == 0
+def test_ioclass_stats_sections(stat_filter, per_core, random_cls):
+    """
+        title: Test for cache/core IO class statistics sections.
+        description: |
+            Check if IO class statistics sections for cache/core print all required entries and
+            no additional ones.
+        pass_criteria:
+          - Section statistics contain all required entries.
+          - Section statistics do not contain any additional entries.
+    """
+    with TestRun.step("Test prepare"):
+        caches, cores = prepare(random_cls, cache_count=4, cores_per_cache=3)
+
+    with TestRun.step(f"Validate displayed {stat_filter.name} statistics for default IO class for "
+                      f"{'cores' if per_core else 'caches'}"):
+        for cache in caches:
+            with TestRun.group(f"Cache {cache.cache_id}"):
+                for core in cache.get_core_devices():
+                    if per_core:
+                        TestRun.LOGGER.info(f"Core {core.cache_id}-{core.core_id}")
+                    statistics = (
+                        core.get_statistics_flat(
+                            io_class_id=0, stat_filter=[stat_filter]) if per_core
+                        else cache.get_statistics_flat(
+                            io_class_id=0, stat_filter=[stat_filter]))
+                    validate_statistics(statistics, stat_filter, per_core)
+                    if not per_core:
+                        break
+
+    with TestRun.step("Load random IO class configuration for each cache"):
+        for cache in caches:
+            random_list = IoClass.generate_random_ioclass_list(ioclass_config.MAX_IO_CLASS_ID + 1)
+            IoClass.save_list_to_config_file(random_list, add_default_rule=False)
+            cache.load_io_class(ioclass_config.default_config_file_path)
+
+    with TestRun.step(f"Validate displayed {stat_filter.name} statistics for every configured IO "
+                      f"class for all {'cores' if per_core else 'caches'}"):
+        for cache in caches:
+            with TestRun.group(f"Cache {cache.cache_id}"):
+                for core in cache.get_core_devices():
+                    core_info = f"Core {core.cache_id}-{core.core_id} ," if per_core else ""
+                    for class_id in range(ioclass_config.MAX_IO_CLASS_ID + 1):
+                        with TestRun.group(core_info + f"IO class id {class_id}"):
+                            statistics = (
+                                core.get_statistics_flat(class_id, [stat_filter]) if per_core
+                                else cache.get_statistics_flat(class_id, [stat_filter]))
+                            validate_statistics(statistics, stat_filter, per_core)
+                            if stat_filter == StatsFilter.conf:  # no percentage statistics for conf
+                                continue
+                            statistics_percents = (
+                                core.get_statistics_flat(
+                                    class_id, [stat_filter], percentage_val=True) if per_core
+                                else cache.get_statistics_flat(
+                                    class_id, [stat_filter], percentage_val=True))
+                            validate_statistics(statistics_percents, stat_filter, per_core)
+                    if not per_core:
+                        break
 
 
-def prepare():
+def get_checked_statistics(stat_filter: StatsFilter, per_core: bool):
+    if stat_filter == StatsFilter.conf:
+        return config_stats_ioclass
+    if stat_filter == StatsFilter.usage:
+        return usage_stats
+    if stat_filter == StatsFilter.blk:
+        return block_stats_core if per_core else block_stats_cache
+    if stat_filter == StatsFilter.req:
+        return request_stats
+
+
+def validate_statistics(statistics: dict, stat_filter: StatsFilter, per_core: bool):
+    for stat_name in get_checked_statistics(stat_filter, per_core):
+        if stat_name not in statistics.keys():
+            TestRun.LOGGER.error(f"Value for {stat_name} not displayed in output")
+        else:
+            del statistics[stat_name]
+    if len(statistics.keys()):
+        TestRun.LOGGER.error(f"Additional statistics found: {', '.join(statistics.keys())}")
+
+
+def prepare(random_cls, cache_count=1, cores_per_cache=1):
+    cache_modes = [CacheMode.WT, CacheMode.WB, CacheMode.WA, CacheMode.WO]
     ioclass_config.remove_ioclass_config()
+
     cache_device = TestRun.disks['cache']
     core_device = TestRun.disks['core']
 
-    cache_device.create_partitions([Size(500, Unit.MebiByte)])
+    cache_device.create_partitions([Size(500, Unit.MebiByte)] * cache_count)
-    core_device.create_partitions([Size(2, Unit.GibiByte)])
+    core_device.create_partitions([Size(2, Unit.GibiByte)] * cache_count * cores_per_cache)
 
-    cache_device = cache_device.partitions[0]
+    cache_devices = cache_device.partitions
-    core_device_1 = core_device.partitions[0]
+    core_devices = core_device.partitions
+    for core_device in core_devices:
+        core_device.create_filesystem(Filesystem.ext4)
 
     Udev.disable()
+    caches, cores = [], []
+    for i, cache_device in enumerate(cache_devices):
+        TestRun.LOGGER.info(f"Starting cache on {cache_device.system_path}")
+        cache = casadm.start_cache(cache_device,
+                                   force=True,
+                                   cache_mode=cache_modes[i],
+                                   cache_line_size=random_cls)
+        caches.append(cache)
+        TestRun.LOGGER.info("Setting cleaning policy to NOP")
+        cache.set_cleaning_policy(CleaningPolicy.nop)
+        for core_device in core_devices[i * cores_per_cache:(i + 1) * cores_per_cache]:
+            TestRun.LOGGER.info(
+                f"Adding core device {core_device.system_path} to cache {cache.cache_id}")
+            core = cache.add_core(core_dev=core_device)
+            core.reset_counters()
+            cores.append(core)
 
-    TestRun.LOGGER.info(f"Staring cache")
+    TestRun.executor.run_expect_success(f"mkdir -p {mountpoint}")
-    cache = casadm.start_cache(cache_device, force=True)
-    TestRun.LOGGER.info(f"Setting cleaning policy to NOP")
-    cache.set_cleaning_policy(CleaningPolicy.nop)
-    TestRun.LOGGER.info(f"Adding core devices")
-    core = cache.add_core(core_dev=core_device_1)
 
-    output = TestRun.executor.run(f"mkdir -p {mountpoint}")
+    return caches, cores
-    if output.exit_code != 0:
-        raise Exception(f"Failed to create mountpoint")
-
-    return cache, core