diff --git a/src/frostfs_testlib/cli/frostfs_cli/object.py b/src/frostfs_testlib/cli/frostfs_cli/object.py
index 1857987..0c00563 100644
--- a/src/frostfs_testlib/cli/frostfs_cli/object.py
+++ b/src/frostfs_testlib/cli/frostfs_cli/object.py
@@ -276,6 +276,53 @@ class FrostfsCliObject(CliCommand):
             **{param: value for param, value in locals().items() if param not in ["self"]},
         )
 
+    def patch(
+        self,
+        rpc_endpoint: str,
+        cid: str,
+        oid: str,
+        range: list[str] = None,
+        payload: list[str] = None,
+        new_attrs: Optional[str] = None,
+        replace_attrs: bool = False,
+        address: Optional[str] = None,
+        bearer: Optional[str] = None,
+        generate_key: Optional[bool] = None,
+        session: Optional[str] = None,
+        timeout: Optional[str] = None,
+        trace: bool = False,
+        ttl: Optional[int] = None,
+        wallet: Optional[str] = None,
+        xhdr: Optional[dict] = None,
+    ) -> CommandResult:
+        """
+        PATCH an object.
+
+        Args:
+            rpc_endpoint: Remote node address (as 'multiaddr' or '<host>:<port>')
+            cid: Container ID
+            oid: Object ID
+            range: An array of ranges in which to replace data in the format [offset1:length1, offset2:length2]
+            payload: An array of file paths to be applied in each range
+            new_attrs: Attributes to be changed in the format Key1=Value1,Key2=Value2
+            replace_attrs: Replace all attributes completely with new ones specified in new_attrs
+            address: Address of wallet account
+            bearer: File with signed JSON or binary encoded bearer token
+            generate_key: Generate new private key
+            session: Filepath to a JSON- or binary-encoded token of the object RANGE session
+            timeout: Timeout for the operation
+            trace: Generate trace ID and print it
+            ttl: TTL value in request meta header (default 2)
+            wallet: WIF (NEP-2) string or path to the wallet or binary key
+            xhdr: Dict with request X-Headers
+        Returns:
+            (str): ID of patched Object
+        """
+        return self._execute(
+            "object patch",
+            **{param: value for param, value in locals().items() if param not in ["self"]},
+        )
+
     def range(
         self,
         rpc_endpoint: str,
diff --git a/src/frostfs_testlib/steps/cli/object.py b/src/frostfs_testlib/steps/cli/object.py
index f28de06..0c30275 100644
--- a/src/frostfs_testlib/steps/cli/object.py
+++ b/src/frostfs_testlib/steps/cli/object.py
@@ -283,6 +283,62 @@ def put_object(
     return oid.strip()
 
 
+@reporter.step("Patch object {cid}/{oid} from {endpoint}")
+def patch_object(
+    wallet: WalletInfo,
+    cid: str,
+    oid: str,
+    shell: Shell,
+    endpoint: str,
+    ranges: list[str] = None,
+    payloads: list[str] = None,
+    new_attrs: Optional[str] = None,
+    replace_attrs: bool = False,
+    bearer: str = "",
+    xhdr: Optional[dict] = None,
+    session: Optional[str] = None,
+    timeout: Optional[str] = CLI_DEFAULT_TIMEOUT,
+    trace: bool = False,
+):
+    """
+    PATCH an object.
+
+    Args:
+        wallet: Wallet on whose behalf PATCH is done
+        cid: ID of Container where we get the Object from
+        oid: Object ID
+        shell: Executor for cli command
+        endpoint: FrostFS endpoint to send request to, appends to `--rpc-endpoint` key
+        ranges: An array of ranges in which to replace data in the format [offset1:length1, offset2:length2]
+        payloads: An array of file paths to be applied in each range
+        new_attrs: Attributes to be changed in the format "key1=value1,key2=value2"
+        replace_attrs: Replace all attributes completely with new ones specified in new_attrs
+        bearer: Path to Bearer Token file, appends to `--bearer` key
+        xhdr: Request X-Headers in form of Key=Value
+        session: Path to a JSON-encoded container session token
+        timeout: Timeout for the operation
+        trace: Generate trace ID and print it
+    Returns:
+        (str): ID of patched Object
+    """
+    cli = FrostfsCli(shell, FROSTFS_CLI_EXEC, wallet.config_path)
+    result = cli.object.patch(
+        rpc_endpoint=endpoint,
+        cid=cid,
+        oid=oid,
+        range=ranges,
+        payload=payloads,
+        new_attrs=new_attrs,
+        replace_attrs=replace_attrs,
+        bearer=bearer,
+        xhdr=xhdr,
+        session=session,
+        timeout=timeout,
+        trace=trace,
+    )
+    return result.stdout.split(":")[1].strip()
+
+
 @reporter.step("Delete object {cid}/{oid} from {endpoint}")
 def delete_object(
     wallet: WalletInfo,
diff --git a/src/frostfs_testlib/storage/constants.py b/src/frostfs_testlib/storage/constants.py
index 2cffd3a..39c6b66 100644
--- a/src/frostfs_testlib/storage/constants.py
+++ b/src/frostfs_testlib/storage/constants.py
@@ -23,4 +23,6 @@ class PlacementRule:
     DEFAULT_PLACEMENT_RULE = "REP 2 IN X CBF 1 SELECT 4 FROM * AS X"
     SINGLE_PLACEMENT_RULE = "REP 1 IN X CBF 1 SELECT 4 FROM * AS X"
     REP_2_FOR_3_NODES_PLACEMENT_RULE = "REP 2 IN X CBF 1 SELECT 3 FROM * AS X"
+    REP_1_FOR_2_NODES_PLACEMENT_RULE = "REP 1 IN X CBF 1 SELECT 2 FROM * AS X"
     DEFAULT_EC_PLACEMENT_RULE = "EC 3.1"
+    EC_1_1_FOR_2_NODES_PLACEMENT_RULE = "EC 1.1 IN X CBF 1 SELECT 2 FROM * AS X"
diff --git a/src/frostfs_testlib/storage/dataclasses/ape.py b/src/frostfs_testlib/storage/dataclasses/ape.py
index ef2e1f2..b7b5dfc 100644
--- a/src/frostfs_testlib/storage/dataclasses/ape.py
+++ b/src/frostfs_testlib/storage/dataclasses/ape.py
@@ -13,6 +13,7 @@ FROSTFS_CONTRACT_CACHE_TIMEOUT = 30
 
 class ObjectOperations(HumanReadableEnum):
     PUT = "object.put"
+    PATCH = "object.patch"
     GET = "object.get"
     HEAD = "object.head"
     GET_RANGE = "object.range"
diff --git a/src/frostfs_testlib/storage/grpc_operations/implementations/object.py b/src/frostfs_testlib/storage/grpc_operations/implementations/object.py
index 0e14aec..215d277 100644
--- a/src/frostfs_testlib/storage/grpc_operations/implementations/object.py
+++ b/src/frostfs_testlib/storage/grpc_operations/implementations/object.py
@@ -407,6 +407,57 @@ class ObjectOperations(interfaces.ObjectInterface):
         oid = id_str.split(":")[1]
         return oid.strip()
 
+    @reporter.step("Patch object")
+    def patch(
+        self,
+        cid: str,
+        oid: str,
+        endpoint: str,
+        ranges: list[str] = None,
+        payloads: list[str] = None,
+        new_attrs: Optional[str] = None,
+        replace_attrs: bool = False,
+        bearer: str = "",
+        xhdr: Optional[dict] = None,
+        session: Optional[str] = None,
+        timeout: Optional[str] = CLI_DEFAULT_TIMEOUT,
+        trace: bool = False,
+    ) -> str:
+        """
+        PATCH an object.
+
+        Args:
+            cid: ID of Container where we get the Object from
+            oid: Object ID
+            endpoint: FrostFS endpoint to send request to, appends to `--rpc-endpoint` key
+            ranges: An array of ranges in which to replace data in the format [offset1:length1, offset2:length2]
+            payloads: An array of file paths to be applied in each range
+            new_attrs: Attributes to be changed in the format "key1=value1,key2=value2"
+            replace_attrs: Replace all attributes completely with new ones specified in new_attrs
+            bearer: Path to Bearer Token file, appends to `--bearer` key
+            xhdr: Request X-Headers in form of Key=Value
+            session: Path to a JSON-encoded container session token
+            timeout: Timeout for the operation
+            trace: Generate trace ID and print it
+        Returns:
+            (str): ID of patched Object
+        """
+        result = self.cli.object.patch(
+            rpc_endpoint=endpoint,
+            cid=cid,
+            oid=oid,
+            range=ranges,
+            payload=payloads,
+            new_attrs=new_attrs,
+            replace_attrs=replace_attrs,
+            bearer=bearer,
+            xhdr=xhdr,
+            session=session,
+            timeout=timeout,
+            trace=trace,
+        )
+        return result.stdout.split(":")[1].strip()
+
     @reporter.step("Put object to random node")
     def put_to_random_node(
         self,
@@ -622,3 +673,30 @@ class ObjectOperations(interfaces.ObjectInterface):
         ]
 
         return object_nodes
+
+    @reporter.step("Search parts of object")
+    def parts(
+        self,
+        cid: str,
+        oid: str,
+        alive_node: ClusterNode,
+        bearer: str = "",
+        xhdr: Optional[dict] = None,
+        is_direct: bool = False,
+        verify_presence_all: bool = False,
+        timeout: Optional[str] = CLI_DEFAULT_TIMEOUT,
+    ) -> list[str]:
+        endpoint = alive_node.storage_node.get_rpc_endpoint()
+        response = self.cli.object.nodes(
+            rpc_endpoint=endpoint,
+            cid=cid,
+            oid=oid,
+            bearer=bearer,
+            ttl=1 if is_direct else None,
+            json=True,
+            xhdr=xhdr,
+            timeout=timeout,
+            verify_presence_all=verify_presence_all,
+        )
+        response_json = json.loads(response.stdout)
+        return [data_object["object_id"] for data_object in response_json["data_objects"]]
diff --git a/src/frostfs_testlib/storage/grpc_operations/interfaces.py b/src/frostfs_testlib/storage/grpc_operations/interfaces.py
index c293c2d..07fe52f 100644
--- a/src/frostfs_testlib/storage/grpc_operations/interfaces.py
+++ b/src/frostfs_testlib/storage/grpc_operations/interfaces.py
@@ -198,6 +198,24 @@ class ObjectInterface(ABC):
     ) -> str:
         pass
 
+    @abstractmethod
+    def patch(
+        self,
+        cid: str,
+        oid: str,
+        endpoint: str,
+        ranges: Optional[list[str]] = None,
+        payloads: Optional[list[str]] = None,
+        new_attrs: Optional[str] = None,
+        replace_attrs: bool = False,
+        bearer: Optional[str] = None,
+        xhdr: Optional[dict] = None,
+        session: Optional[str] = None,
+        timeout: Optional[str] = None,
+        trace: bool = False,
+    ) -> str:
+        pass
+
     @abstractmethod
     def put_to_random_node(
         self,
@@ -264,6 +282,20 @@ class ObjectInterface(ABC):
     ) -> List[ClusterNode]:
         pass
 
+    @abstractmethod
+    def parts(
+        self,
+        cid: str,
+        oid: str,
+        alive_node: ClusterNode,
+        bearer: str = "",
+        xhdr: Optional[dict] = None,
+        is_direct: bool = False,
+        verify_presence_all: bool = False,
+        timeout: Optional[str] = None,
+    ) -> List[str]:
+        pass
+
 
 class ContainerInterface(ABC):
     @abstractmethod