diff --git a/changelogs/fragments/69153-ovirt_disk-add-warning-when-uploading-wrong-format.yml b/changelogs/fragments/69153-ovirt_disk-add-warning-when-uploading-wrong-format.yml
new file mode 100644
index 00000000000..37c419d44af
--- /dev/null
+++ b/changelogs/fragments/69153-ovirt_disk-add-warning-when-uploading-wrong-format.yml
@@ -0,0 +1,2 @@
+bugfixes:
+  - "ovirt_disk: add warning when uploading wrong format"
diff --git a/lib/ansible/modules/cloud/ovirt/ovirt_disk.py b/lib/ansible/modules/cloud/ovirt/ovirt_disk.py
index 4420d8d663c..4c9fb9b3f23 100644
--- a/lib/ansible/modules/cloud/ovirt/ovirt_disk.py
+++ b/lib/ansible/modules/cloud/ovirt/ovirt_disk.py
@@ -58,6 +58,7 @@ options:
                if you want to upload the disk even if the disk with C(id) or C(name) exists,
                then please use C(force) I(true). If you will use C(force) I(false), which
                is default, then the disk image won't be uploaded."
+            - "Note that to upload iso the C(format) should be 'raw'"
         version_added: "2.3"
     size:
         description:
@@ -73,6 +74,7 @@ options:
         description:
             - Specify format of the disk.
             - Note that this option isn't idempotent as it's not currently possible to change format of the disk via API.
+        default: 'cow'
         choices: ['raw', 'cow']
     content_type:
         description:
@@ -740,6 +742,8 @@ def main():
 
             # Upload disk image in case it's new disk or force parameter is passed:
             if module.params['upload_image_path'] and (is_new_disk or module.params['force']):
+                if module.params['format'] == 'cow' and module.params['content_type'] == 'iso':
+                    module.warn("To upload an ISO image 'format' parameter needs to be set to 'raw'.")
                 uploaded = upload_disk_image(connection, module)
                 ret['changed'] = ret['changed'] or uploaded
             # Download disk image in case it's file don't exist or force parameter is passed:
diff --git a/test/sanity/ignore.txt b/test/sanity/ignore.txt
index eb0ae20f93b..19cf0ba455b 100644
--- a/test/sanity/ignore.txt
+++ b/test/sanity/ignore.txt
@@ -1707,7 +1707,6 @@ lib/ansible/modules/cloud/ovirt/ovirt_datacenter_info.py validate-modules:doc-mi
 lib/ansible/modules/cloud/ovirt/ovirt_disk.py future-import-boilerplate
 lib/ansible/modules/cloud/ovirt/ovirt_disk.py metaclass-boilerplate
 lib/ansible/modules/cloud/ovirt/ovirt_disk.py validate-modules:undocumented-parameter
-lib/ansible/modules/cloud/ovirt/ovirt_disk.py validate-modules:doc-default-does-not-match-spec
 lib/ansible/modules/cloud/ovirt/ovirt_disk.py validate-modules:doc-choices-do-not-match-spec
 lib/ansible/modules/cloud/ovirt/ovirt_disk.py validate-modules:parameter-type-not-in-doc
 lib/ansible/modules/cloud/ovirt/ovirt_disk.py validate-modules:doc-missing-type