diff --git a/test_suite/mars/modules/datadev_full.sh b/test_suite/mars/modules/datadev_full.sh
index 22aab74d..54bb91ba 100644
--- a/test_suite/mars/modules/datadev_full.sh
+++ b/test_suite/mars/modules/datadev_full.sh
@@ -35,7 +35,7 @@ function datadev_full_run
     resize_prepare
 
     datadev_full_dd_on_device $primary_host $data_dev \
-                              $(($data_dev_size_orig + 1)) 123 1 
+                              $(( 1024 * ($data_dev_size_orig + 1) )) 123 1 
     resize_do_resize $primary_host $secondary_host $res $dev \
                      $data_dev_size_new $mars_data_dev_size_new
 
@@ -54,8 +54,8 @@ function datadev_full_run
 function datadev_full_dd_on_device
 {
     [ $# -eq 5 ] || lib_exit 1 "wrong number $# of arguments (args = $*)"
-    local host=$1 dev=$2 size=$3 control_nr=$4 should_fail=$5
-    local bs=4096 count=$(($size * 1024 * 1024 / 4)) 
+    local host=$1 dev=$2 size_mb=$3 control_nr=$4 should_fail=$5
+    local bs=4096 count=$(($size_mb * 1024 / 4)) 
     local dd_out rc
     local err_msg='No space left on device'
 
diff --git a/test_suite/mars/modules/resize.sh b/test_suite/mars/modules/resize.sh
index f53d5809..93fd3300 100644
--- a/test_suite/mars/modules/resize.sh
+++ b/test_suite/mars/modules/resize.sh
@@ -123,8 +123,8 @@ function resize_check_resize_post_conditions
     fi
     for test_size in $(($mars_data_dev_size_new - 1)) $mars_data_dev_size_new
     do
-        datadev_full_dd_on_device $primary_host $test_file $test_size 4711 \
-                                  $should_fail
+        datadev_full_dd_on_device $primary_host $test_file \
+                                  $(( 1024 * $test_size )) 4711 $should_fail
         should_fail=1
         lib_remote_idfile $primary_host \
                           "if ls -l $test_file; then rm -f $test_file;fi" \
diff --git a/test_suite/mars/modules/resource.sh b/test_suite/mars/modules/resource.sh
index 128b3431..3a364989 100644
--- a/test_suite/mars/modules/resource.sh
+++ b/test_suite/mars/modules/resource.sh
@@ -318,7 +318,8 @@ function resource_write_file_until_mars_dir_full
     [ $# -eq 4 ] || lib_exit 1 "wrong number $# of arguments (args = $*)"
     local host=$1 mars_dir=$2 mars_dev_size=$3 file_to_fill=$4
     local df_out use_percent rc
-    datadev_full_dd_on_device $host $file_to_fill $(($mars_dev_size + 1)) 4711 1
+    datadev_full_dd_on_device $host $file_to_fill \
+                            $(( 1024 * ($mars_dev_size + 1) )) 4711 1
     lib_remote_idfile $host "ls -l $file_to_fill" || lib_exit 1
     lib_vmsg "  checking space on $host:$mars_dir"
     df_out=($(lib_remote_idfile $host "df -B1 $mars_dir")) || lib_exit 1
@@ -356,8 +357,8 @@ function resource_dd_until_mars_dir_full
 
     while true;do
         local free df_out
-        datadev_full_dd_on_device $primary_host $data_dev $write_per_loop \
-                                  $control_nr 0
+        datadev_full_dd_on_device $primary_host $data_dev \
+                                  $(( 1024 * $write_per_loop )) $control_nr 0
         let written+=$write_per_loop
         let control_nr+=1
         df_out=($(lib_remote_idfile $primary_host "df -B1 $mars_dir | \