Instruct qemu-img to write image zeros to disk.

Doing this will cause it not to zero out the entire
block device which can be very costly on a slow HDD.

Story: 2009227
Task: 43315

Change-Id: I62ba2afc037d9844387e6b0984fe5008779d95d2

ironic_python_agent/extensions/standby.py

@@ -200,12 +200,13 @@ def _write_whole_disk_image(image, image_info, device):
     disk_utils.udev_settle()
 
     command = ['qemu-img', 'convert',
-               '-t', 'directsync', '-O', 'host_device', '-W',
+               '-t', 'directsync', '-S', '0', '-O', 'host_device', '-W',
                image, device]
     LOG.info('Writing image with command: %s', ' '.join(command))
     try:
         disk_utils.convert_image(image, device, out_format='host_device',
-                                 cache='directsync', out_of_order=True)
+                                 cache='directsync', out_of_order=True,
+                                 sparse_size='0')
     except processutils.ProcessExecutionError as e:
         raise errors.ImageWriteError(device, e.exit_code, e.stdout, e.stderr)
 

ironic_python_agent/tests/unit/extensions/test_standby.py

@@ -182,7 +182,8 @@ class TestStandbyExtension(base.IronicAgentTest):
         convert_mock.assert_called_once_with(location, device,
                                              out_format='host_device',
                                              cache='directsync',
-                                             out_of_order=True)
+                                             out_of_order=True,
+                                             sparse_size='0')
         wipe_mock.assert_called_once_with(device, '')
         udev_mock.assert_called_once_with()
         rescan_mock.assert_called_once_with(device)

lower-constraints.txt

@@ -6,7 +6,7 @@ cryptography==2.3
 dogpile.cache==0.9.2
 eventlet==0.18.2
 importlib_metadata==1.7.0;python_version<'3.8'
-ironic-lib==4.7.1
+ironic-lib==5.1.0
 netifaces==0.10.4
 openstacksdk==0.49.0
 oslo.concurrency==3.26.0
@@ -14,7 +14,7 @@ oslo.config==5.2.0
 oslo.log==3.36.0
 oslo.serialization==2.18.0
 oslo.service==1.24.0
-oslo.utils==3.33.0
+oslo.utils==3.34.0
 oslotest==3.2.0
 pbr==2.0.0
 psutil==3.2.2

releasenotes/notes/qemu-write-zeros-2edbf3152c57e2b6.yaml

@@ -0,0 +1,6 @@
+---
+fixes:
+  - |
+    IPA instructs qemu-img to write image zeros to disk.
+    Doing this will cause it not to zero out the entire
+    block device which can be very costly on a slow HDD.

requirements.txt

@@ -10,13 +10,13 @@ oslo.concurrency>=3.26.0 # Apache-2.0
 oslo.log>=3.36.0 # Apache-2.0
 oslo.serialization!=2.19.1,>=2.18.0 # Apache-2.0
 oslo.service!=1.28.1,>=1.24.0 # Apache-2.0
-oslo.utils>=3.33.0 # Apache-2.0
+oslo.utils>=3.34.0 # Apache-2.0
 Pint>=0.5 # BSD
 psutil>=3.2.2 # BSD
 pyudev>=0.18 # LGPLv2.1+
 requests>=2.14.2 # Apache-2.0
 stevedore>=1.20.0 # Apache-2.0
 tenacity>=6.2.0 # Apache-2.0
-ironic-lib>=4.7.1 # Apache-2.0
+ironic-lib>=5.1.0 # Apache-2.0
 Werkzeug>=1.0.1 # BSD License
 cryptography>=2.3 # BSD/Apache-2.0