block_size parameter for dd

Signed-off-by: Tullio Sebastiani <[email protected]> removed log Signed-off-by: Tullio Sebastiani <[email protected]>
krkn-chaos · Oct 16, 2024 · ce8ab91 · ce8ab91
1 parent 04e4473
commit ce8ab91
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Showing 2 changed files with 7 additions and 40 deletions.
diff --git a/krkn/scenario_plugins/pvc/pvc_scenario_plugin.py b/krkn/scenario_plugins/pvc/pvc_scenario_plugin.py
@@ -29,6 +29,9 @@ def run(
                 pvc_name = get_yaml_item_value(scenario_config, "pvc_name", "")
                 pod_name = get_yaml_item_value(scenario_config, "pod_name", "")
                 namespace = get_yaml_item_value(scenario_config, "namespace", "")
+                block_size = get_yaml_item_value(
+                    scenario_config, "block_size", "102400"
+                )
                 target_fill_percentage = get_yaml_item_value(
                     scenario_config, "fill_percentage", "50"
                 )
@@ -197,10 +200,12 @@ def run(
                         str(full_path),
                     )
                 elif dd is not None:
+                    block_size = int(block_size)
+                    blocks = int(file_size_kb / int(block_size / 1024))
                     logging.warning(
                         "fallocate not found, using dd, it may take longer based on the amount of data, please wait..."
                     )
-                    command = f"dd if=/dev/urandom of={str(full_path)} bs=1024 count={str(file_size_kb)} oflag=direct"
+                    command = f"dd if=/dev/urandom of={str(full_path)} bs={str(block_size)} count={str(blocks)} oflag=direct"
                 else:
                     logging.error(
                         "failed to locate required binaries fallocate or dd to execute the scenario"
@@ -241,45 +246,6 @@ def run(
                     )
                     return 1
 
-            # Calculate file size
-            file_size_kb = int(
-                (float(target_fill_percentage / 100) * float(pvc_capacity_kb))
-                - float(pvc_used_kb)
-            )
-            logging.debug("File size: %s KB" % file_size_kb)
-
-            file_name = "kraken.tmp"
-            logging.info(
-                "Creating %s file, %s KB size, in pod %s at %s (ns %s)"
-                % (
-                    str(file_name),
-                    str(file_size_kb),
-                    str(pod_name),
-                    str(mount_path),
-                    str(namespace),
-                )
-            )
-
-            start_time = int(time.time())
-            # Create temp file in the PVC
-            full_path = "%s/%s" % (str(mount_path), str(file_name))
-            command = "fallocate -l $((%s*1024)) %s" % (
-                str(file_size_kb),
-                str(full_path),
-            )
-            logging.debug("Create temp file in the PVC command:\n %s" % command)
-            lib_telemetry.get_lib_kubernetes().exec_cmd_in_pod(
-                [command], pod_name, namespace, container_name
-            )
-
-            # Check if file is created
-            command = "ls -lh %s" % (str(mount_path))
-            logging.debug("Check file is created command:\n %s" % command)
-            response = lib_telemetry.get_lib_kubernetes().exec_cmd_in_pod(
-                [command], pod_name, namespace, container_name
-            )
-            logging.info("\n" + str(response))
-            if str(file_name).lower() in str(response).lower():
                 logging.info(
                     "Waiting for the specified duration in the config: %ss" % duration
                 )

diff --git a/scenarios/openshift/pvc_scenario.yaml b/scenarios/openshift/pvc_scenario.yaml
@@ -4,3 +4,4 @@ pvc_scenario:
   namespace: <namespace_name>   # Namespace where the PVC is
   fill_percentage: 50           # Target percentage to fill up the cluster, value must be higher than current percentage, valid values are between 0 and 99
   duration: 60                  # Duration in seconds for the fault
+  block_size: 102400            # used only by dd if fallocate not present in the container