diff --git a/src/frostfs_testlib/load/k6.py b/src/frostfs_testlib/load/k6.py
index d3939ae..24ca447 100644
--- a/src/frostfs_testlib/load/k6.py
+++ b/src/frostfs_testlib/load/k6.py
@@ -239,4 +239,4 @@ class K6:
 
     def __log_output(self) -> None:
         reporter.attach(self._k6_process.stdout(full=True), "K6 stdout")
-        reporter.attach(self._k6_process.stderr(full=True), "K6 stderr")
+        reporter.attach(f"{self._k6_process.process_dir}/stderr", "K6 stderr path")
diff --git a/src/frostfs_testlib/load/load_verifiers.py b/src/frostfs_testlib/load/load_verifiers.py
index becfcf7..69e9f1f 100644
--- a/src/frostfs_testlib/load/load_verifiers.py
+++ b/src/frostfs_testlib/load/load_verifiers.py
@@ -11,26 +11,53 @@ class LoadVerifier:
         self.load_params = load_params
 
     def verify_summaries(self, load_summary, verification_summary) -> None:
+        exceptions = []
+
         if not verification_summary or not load_summary:
             logger.info("Can't check load results due to missing summary")
 
         load_metrics = get_metrics_object(self.load_params.scenario, load_summary)
-        writers = self.load_params.writers or 0
+
+        writers = self.load_params.writers or self.load_params.preallocated_writers or 0
+        readers = self.load_params.readers or self.load_params.preallocated_readers or 0
+        deleters = self.load_params.deleters or self.load_params.preallocated_deleters or 0
 
         objects_count = load_metrics.write_success_iterations
         fails_count = load_metrics.write_failed_iterations
 
         if writers > 0:
-            assert objects_count > 0, "Total put objects should be greater than 0"
-        assert fails_count == 0, f"There were {fails_count} failed put objects operations"
+            if objects_count < 1:
+                exceptions.append("Total put objects should be greater than 0")
+            if fails_count > 0:
+                exceptions.append(f"There were {fails_count} failed write operations")
+
+        if readers > 0:
+            read_count = load_metrics.read_success_iterations
+            read_fails_count = load_metrics.read_failed_iterations
+            if read_count < 1:
+                exceptions.append("Total read operations should be greater than 0")
+            if read_fails_count > 0:
+                exceptions.append(f"There were {read_fails_count} failed read operations")
+
+        if deleters > 0:
+            delete_count = load_metrics.delete_success_iterations
+            delete_fails_count = load_metrics.delete_failed_iterations
+            if delete_count < 1:
+                exceptions.append("Total delete operations should be greater than 0")
+            if delete_fails_count > 0:
+                exceptions.append(f"There were {delete_fails_count} failed delete operations")
 
         if verification_summary:
             verify_metrics = get_metrics_object(LoadScenario.VERIFY, verification_summary)
             verified_objects = verify_metrics.read_success_iterations
             invalid_objects = verify_metrics.read_failed_iterations
 
-            assert invalid_objects == 0, f"There were {invalid_objects} verification fails"
+            if invalid_objects > 0:
+                exceptions.append(f"There were {invalid_objects} verification fails")
             # Due to interruptions we may see total verified objects to be less than written on writers count
-            assert (
-                abs(objects_count - verified_objects) <= writers
-            ), f"Verified objects is less than total objects. Total: {objects_count}, Verified: {verified_objects}. Writers: {writers}."
+            if abs(objects_count - verified_objects) > writers:
+                exceptions.append(
+                    f"Verified objects is less than total objects. Total: {objects_count}, Verified: {verified_objects}. Writers: {writers}."
+                )
+
+        assert not exceptions, "\n".join(exceptions)
diff --git a/src/frostfs_testlib/resources/load_params.py b/src/frostfs_testlib/resources/load_params.py
index a43d20b..64f1aa4 100644
--- a/src/frostfs_testlib/resources/load_params.py
+++ b/src/frostfs_testlib/resources/load_params.py
@@ -7,8 +7,8 @@ LOAD_NODE_SSH_USER = os.getenv("LOAD_NODE_SSH_USER", "service")
 LOAD_NODE_SSH_PASSWORD = os.getenv("LOAD_NODE_SSH_PASSWORD")
 LOAD_NODE_SSH_PRIVATE_KEY_PATH = os.getenv("LOAD_NODE_SSH_PRIVATE_KEY_PATH")
 LOAD_NODE_SSH_PRIVATE_KEY_PASSPHRASE = os.getenv("LOAD_NODE_SSH_PRIVATE_KEY_PASSPHRASE")
-BACKGROUND_WRITERS_COUNT = os.getenv("BACKGROUND_WRITERS_COUNT", 4)
-BACKGROUND_READERS_COUNT = os.getenv("BACKGROUND_READERS_COUNT", 4)
+BACKGROUND_WRITERS_COUNT = os.getenv("BACKGROUND_WRITERS_COUNT", 0)
+BACKGROUND_READERS_COUNT = os.getenv("BACKGROUND_READERS_COUNT", 0)
 BACKGROUND_DELETERS_COUNT = os.getenv("BACKGROUND_DELETERS_COUNT", 0)
 BACKGROUND_LOAD_DEFAULT_TIME = os.getenv("BACKGROUND_LOAD_DEFAULT_TIME", 600)
 BACKGROUND_LOAD_DEFAULT_OBJECT_SIZE = os.getenv("BACKGROUND_LOAD_DEFAULT_OBJECT_SIZE", 32)