added BLOCK_SIZE variable for dd failover

Signed-off-by: Tullio Sebastiani <[email protected]>

docs/pvc-scenarios.md

@@ -39,5 +39,5 @@ POD_NAME                | Targeted pod in the cluster (if null, PVC_NAME is requ
 NAMESPACE               | Targeted namespace in the cluster (required)                                    |                                      |
 FILL_PERCENTAGE         | Targeted percentage to be filled up in the PVC                                  | 50                                   |
 DURATION                | Duration in seconds with the PVC filled up                                      | 60                                   |
-
+BLOCK_SIZE              | Block size (used by dd if fallocate not available in the container)             | 102400
 **NOTE** Set NAMESPACE environment variable to `openshift-.*` to pick and disrupt pods randomly in openshift system namespaces, the DAEMON_MODE can also be enabled to disrupt the pods every x seconds in the background to check the reliability.

pvc-scenario/env.sh

@@ -8,4 +8,5 @@ export FILL_PERCENTAGE=${FILL_PERCENTAGE:="50"}
 export DURATION=${DURATION:="60"}
 export SCENARIO_TYPE=${SCENARIO_TYPE:=pvc_scenarios}
 export SCENARIO_FILE=${SCENARIO_FILE:=scenarios/pvc_scenario.yaml}
+export BLOCK_SIZE=${BLOCK_SIZE:="102400"}
 

pvc-scenario/pvc_scenario.yaml.template

@@ -4,3 +4,4 @@ pvc_scenario:
   namespace: $NAMESPACE                # Namespace where the PVC is
   fill_percentage: $FILL_PERCENTAGE    # Target percentage to fill up the cluster, value must be higher than current percentage, valid values are between 0 and 99
   duration: $DURATION                  # Duration in seconds for the fault
+  block_size: $BLOCK_SIZE              # used only by dd if fallocate not present in the container