diff --git a/ironic/drivers/modules/deploy_utils.py b/ironic/drivers/modules/deploy_utils.py
index 205fb39fa3..38a16c2f8d 100644
--- a/ironic/drivers/modules/deploy_utils.py
+++ b/ironic/drivers/modules/deploy_utils.py
@@ -1123,7 +1123,9 @@ def parse_instance_info(node):
                   " in node's instance_info")
     check_for_missing_params(i_info, error_msg)
 
-    i_info['swap_mb'] = int(info.get('swap_mb', 0))
+    # NOTE(vdrok): We're casting disk layout parameters to int only after
+    # ensuring that it is possible
+    i_info['swap_mb'] = info.get('swap_mb', 0)
     i_info['ephemeral_gb'] = info.get('ephemeral_gb', 0)
     err_msg_invalid = _("Cannot validate parameter for driver deploy. "
                         "Invalid parameter %(param)s. Reason: %(reason)s")
@@ -1136,10 +1138,12 @@ def parse_instance_info(node):
                                                   {'param': param,
                                                    'reason': reason})
 
-    i_info['root_mb'] = 1024 * int(info.get('root_gb'))
+    i_info['root_mb'] = 1024 * int(i_info['root_gb'])
+    i_info['swap_mb'] = int(i_info['swap_mb'])
+    i_info['ephemeral_mb'] = 1024 * int(i_info['ephemeral_gb'])
 
     if iwdi:
-        if int(i_info['swap_mb']) > 0 or int(i_info['ephemeral_gb']) > 0:
+        if i_info['swap_mb'] > 0 or i_info['ephemeral_mb'] > 0:
             err_msg_invalid = _("Cannot deploy whole disk image with "
                                 "swap or ephemeral size set")
             raise exception.InvalidParameterValue(err_msg_invalid)
diff --git a/ironic/drivers/modules/iscsi_deploy.py b/ironic/drivers/modules/iscsi_deploy.py
index 82d05b28e2..0418131573 100644
--- a/ironic/drivers/modules/iscsi_deploy.py
+++ b/ironic/drivers/modules/iscsi_deploy.py
@@ -207,9 +207,9 @@ def get_deploy_info(node, address, iqn, port=None, lun='1'):
 
     is_whole_disk_image = node.driver_internal_info['is_whole_disk_image']
     if not is_whole_disk_image:
-        params.update({'root_mb': 1024 * int(i_info['root_gb']),
-                       'swap_mb': int(i_info['swap_mb']),
-                       'ephemeral_mb': 1024 * int(i_info['ephemeral_gb']),
+        params.update({'root_mb': i_info['root_mb'],
+                       'swap_mb': i_info['swap_mb'],
+                       'ephemeral_mb': i_info['ephemeral_mb'],
                        'preserve_ephemeral': i_info['preserve_ephemeral'],
                        'boot_option': deploy_utils.get_boot_option(node),
                        'boot_mode': _get_boot_mode(node)})
diff --git a/ironic/tests/unit/drivers/modules/test_deploy_utils.py b/ironic/tests/unit/drivers/modules/test_deploy_utils.py
index 07ac3827b4..c44ad90ac1 100644
--- a/ironic/tests/unit/drivers/modules/test_deploy_utils.py
+++ b/ironic/tests/unit/drivers/modules/test_deploy_utils.py
@@ -2125,6 +2125,7 @@ class InstanceInfoTestCase(db_base.DbTestCase):
 
     def test_parse_instance_info_valid_ephemeral_gb(self):
         ephemeral_gb = 10
+        ephemeral_mb = 1024 * ephemeral_gb
         ephemeral_fmt = 'test-fmt'
         info = dict(INST_INFO_DICT)
         info['ephemeral_gb'] = ephemeral_gb
@@ -2134,7 +2135,7 @@ class InstanceInfoTestCase(db_base.DbTestCase):
             driver_internal_info=DRV_INTERNAL_INFO_DICT,
         )
         data = utils.parse_instance_info(node)
-        self.assertEqual(ephemeral_gb, data['ephemeral_gb'])
+        self.assertEqual(ephemeral_mb, data['ephemeral_mb'])
         self.assertEqual(ephemeral_fmt, data['ephemeral_format'])
 
     def test_parse_instance_info_unicode_swap_mb(self):
@@ -2308,9 +2309,9 @@ class InstanceInfoTestCase(db_base.DbTestCase):
         )
         instance_info = utils.parse_instance_info(node)
         self.assertIsNotNone(instance_info['image_source'])
-        self.assertIsNotNone(instance_info['root_gb'])
+        self.assertIsNotNone(instance_info['root_mb'])
         self.assertEqual(0, instance_info['swap_mb'])
-        self.assertEqual(0, instance_info['ephemeral_gb'])
+        self.assertEqual(0, instance_info['ephemeral_mb'])
         self.assertIsNone(instance_info['configdrive'])
 
     def test_parse_instance_info_whole_disk_image_missing_root(self):
diff --git a/releasenotes/notes/fix-ipa-ephemeral-partition-1f1e020727a49078.yaml b/releasenotes/notes/fix-ipa-ephemeral-partition-1f1e020727a49078.yaml
new file mode 100644
index 0000000000..ff392b614f
--- /dev/null
+++ b/releasenotes/notes/fix-ipa-ephemeral-partition-1f1e020727a49078.yaml
@@ -0,0 +1,5 @@
+---
+fixes:
+  - Fixed a bug where the ironic python agent ramdisk was not creating an
+    ephemeral partition because the ephemeral partition size was not being
+    passed correctly to the agent.