diff --git a/ironic/drivers/modules/drac/raid.py b/ironic/drivers/modules/drac/raid.py
index f90948e05c..bd2a3f5ac7 100644
--- a/ironic/drivers/modules/drac/raid.py
+++ b/ironic/drivers/modules/drac/raid.py
@@ -495,7 +495,7 @@ def _calculate_volume_props(logical_disk, physical_disks, free_space_mb):
         error_msg = _('invalid number of physical disks was provided')
         raise exception.DracOperationError(error=error_msg)
 
-    disks_per_span = len(selected_disks) / spans_count
+    disks_per_span = int(len(selected_disks) / spans_count)
 
     # Best practice is to not pass span_length and span_depth when creating a
     # RAID10.  The iDRAC will dynamically calculate these values using maximum
diff --git a/releasenotes/notes/bug-2004265-cd9056868295f374.yaml b/releasenotes/notes/bug-2004265-cd9056868295f374.yaml
new file mode 100644
index 0000000000..5d25b5ea8b
--- /dev/null
+++ b/releasenotes/notes/bug-2004265-cd9056868295f374.yaml
@@ -0,0 +1,7 @@
+---
+fixes:
+  - |
+    Fixes 'Invalid parameter value for SpanLength' when configuring RAID
+    using Python 3. This passed incorrect data type to iDRAC, e.g., instead
+    of `2` it passed `2.0`.
+    See `story 2004265 <https://storyboard.openstack.org/#!/story/2004265>`_.