diff --git a/ceph_bench/definitions.py b/ceph_bench/definitions.py
index e1a7387..ed65581 100644
--- a/ceph_bench/definitions.py
+++ b/ceph_bench/definitions.py
@@ -1,8 +1,8 @@
 SAMPLES = {
-    "XXXS": {"size": 0.1, "number": 10000},
+    "XXXS": {"size": 0.1, "number": 20000},
     "XXS": {"size": 10, "number": 10000},
     "XS": {"size": 100, "number": 10000},
-    "S": {"size": 1000, "number": 1000},
+    "S": {"size": 1000, "number": 2000},
     "M": {"size": 10000, "number": 500},
     "ML": {"size": 100000, "number": 100},
     "L": {"size": 1000000, "number": 20},
diff --git a/ceph_bench/generate_samples.py b/ceph_bench/generate_samples.py
index 57e028f..7b67dd3 100644
--- a/ceph_bench/generate_samples.py
+++ b/ceph_bench/generate_samples.py
@@ -3,11 +3,10 @@ import os
 import subprocess
 from uuid import uuid4
 
+from definitions import INST_STO_ROOT, SAMPLES, TEST_FILES
 from loguru import logger as log
 from tqdm import tqdm
 
-from definitions import INST_STO_ROOT, SAMPLES, TEST_FILES
-
 if __name__ == "__main__":
     for path, data in SAMPLES.items():
         log.info(f"processing {path}")
@@ -18,7 +17,7 @@ if __name__ == "__main__":
                     "dd",
                     "if=/dev/urandom",
                     f"of={INST_STO_ROOT+path}/{x}",
-                    f"bs={int(data['size']*1000)}",
+                    f"bs={int(data['size']*1024)}",
                     "count=1",
                 ],
                 capture_output=True,
@@ -34,7 +33,7 @@ if __name__ == "__main__":
                     "dd",
                     "if=/dev/urandom",
                     f"of={INST_STO_ROOT}Rand/{uuid4()}",
-                    f"bs={int(data['size']*1000)}",
+                    f"bs={int(data['size']*1024)}",
                     "count=1",
                 ],
                 capture_output=True,
@@ -50,7 +49,7 @@ if __name__ == "__main__":
                     "dd",
                     "if=/dev/urandom",
                     f"of={INST_STO_ROOT}test/{uuid4()}",
-                    f"bs={int(data['size']*1000)}",
+                    f"bs={int(data['size']*1024)}",
                     "count=1",
                 ],
                 capture_output=True,