diff --git a/test/functional/api/cas/casadm_parser.py b/test/functional/api/cas/casadm_parser.py
index a21509a8d..0104151a0 100644
--- a/test/functional/api/cas/casadm_parser.py
+++ b/test/functional/api/cas/casadm_parser.py
@@ -68,6 +68,36 @@ def is_active(core):
     ]
 
 
+def get_inactive_cores(cache_id: int) -> list:
+    from api.cas.core import Core, CoreStatus
+
+    cores_dict = get_cas_devices_dict()["cores"].values()
+
+    def is_inactive(core):
+        return CoreStatus[core["status"].lower()] == CoreStatus.inactive
+
+    return [
+        Core(core["device_path"], core["cache_id"])
+        for core in cores_dict
+        if is_inactive(core) and core["cache_id"] == cache_id
+    ]
+
+
+def get_detached_cores(cache_id: int) -> list:
+    from api.cas.core import Core, CoreStatus
+
+    cores_dict = get_cas_devices_dict()["cores"].values()
+
+    def is_detached(core):
+        return CoreStatus[core["status"].lower()] == CoreStatus.detached
+
+    return [
+        Core(core["device_path"], core["cache_id"])
+        for core in cores_dict
+        if is_detached(core) and core["cache_id"] == cache_id
+    ]
+
+
 def get_cas_devices_dict() -> dict:
     device_list = list(csv.DictReader(casadm.list_caches(OutputFormat.csv).stdout.split("\n")))
     devices = {"caches": {}, "cores": {}, "core_pool": {}}
@@ -92,9 +122,7 @@ def get_cas_devices_dict() -> dict:
             ]
             if core_pool:
                 params.append(("core_pool", device))
-                devices["core_pool"][device["disk"]] = dict(
-                    [(key, value) for key, value in params]
-                )
+                devices["core_pool"][device["disk"]] = dict([(key, value) for key, value in params])
             else:
                 devices["cores"][(cache_id, int(device["id"]))] = dict(
                     [(key, value) for key, value in params]
@@ -205,11 +233,14 @@ def get_io_class_list(cache_id: int) -> list:
     return ret
 
 
-def get_core_info_by_path(core_disk_path) -> dict | None:
+def get_core_info_by_path(core_disk_path: str, target_cache_id: int) -> dict | None:
     output = casadm.list_caches(OutputFormat.csv, by_id_path=True)
     reader = csv.DictReader(io.StringIO(output.stdout))
+    cache_id = -1
     for row in reader:
-        if row["type"] == "core" and row["disk"] == core_disk_path:
+        if row["type"] == "cache":
+            cache_id = int(row["id"])
+        if row["type"] == "core" and row["disk"] == core_disk_path and target_cache_id == cache_id:
             return {
                 "core_id": row["id"],
                 "core_device": row["disk"],
diff --git a/test/functional/api/cas/core.py b/test/functional/api/cas/core.py
index f298984b1..070cca078 100644
--- a/test/functional/api/cas/core.py
+++ b/test/functional/api/cas/core.py
@@ -35,18 +35,19 @@ class Core(Device):
     def __init__(self, core_device: str, cache_id: int):
         self.core_device = Device(core_device)
         self.path = None
+        self.cache_id = cache_id
         core_info = self.__get_core_info()
         # "-" is special case for cores in core pool
         if core_info["core_id"] != "-":
             self.core_id = int(core_info["core_id"])
         if core_info["exp_obj"] != "-":
             Device.__init__(self, core_info["exp_obj"])
-        self.cache_id = cache_id
         self.partitions = []
         self.block_size = None
 
     def __get_core_info(self):
-        return get_core_info_by_path(self.core_device.path)
+        return get_core_info_by_path(core_disk_path=self.core_device.path,
+                                     target_cache_id=self.cache_id)
 
     def create_filesystem(self, fs_type: disk_utils.Filesystem, force=True, blocksize=None):
         super().create_filesystem(fs_type, force, blocksize)