diff --git a/ungleich-ceph.py b/ungleich-ceph.py
new file mode 100755
index 0000000..cfe7c90
--- /dev/null
+++ b/ungleich-ceph.py
@@ -0,0 +1,57 @@
+#!/usr/bin/env python3
+
+import argparse
+
+
+def do_full_disk(args):
+    print("full disk mode")
+
+
+def do_rest_of_disk(args):
+    print("rest of disk mode")
+
+
+MODES = {
+    "full-disk": do_full_disk,
+    "rest-of-disk": do_rest_of_disk,
+}
+
+
+def check_mode(value):
+    if value not in MODES:
+        raise argparse.ArgumentTypeError("Invalid mode {}".format(value))
+    return value
+
+
+def parse_args():
+    parser = argparse.ArgumentParser()
+    parser.add_argument('-c', action='store', dest='class', required=False,
+                        help=('device class, e.g. hdd or ssd (only used in '
+                              'rest-of-disk mode)'))
+    parser.add_argument('-F', action='store_true', dest='fullsize',
+                        required=False, default=False,
+                        help='use fullsize (only used in full-disk mode)')
+    parser.add_argument('-m', action='store', dest='mode', required=True,
+                        type=check_mode,
+                        help=('operate in specified mode: full-disk, '
+                              'rest-of-disk'))
+    parser.add_argument('-n', action='store_true', dest='dry_run',
+                        required=False, default=False,
+                        help=('do not execute code, only print what would '
+                              'be done'))
+    parser.add_argument('-w', action='store', dest='weight', required=False,
+                        help=('OSD weight (only used in rest-of-disk mode)'))
+    parser.add_argument('device', nargs='+', help='device to create OSD on')
+    args = parser.parse_args()
+    return args
+
+
+def main():
+    args = parse_args()
+    print(args)
+    mode = args.mode
+    MODES[mode](args)
+
+
+if __name__ == "__main__":
+    main()