RBD: Fix total_capacity
Ceph has changed the meaning of the ``bytes_used`` column in the pools
reported by the ``df`` command, which means that in some deployments the
rbd driver is not reporting the expected information ot the schedulers.
The information we should be used for the calculations is returned in
the ``stored`` field in those systems.
This patch uses ``stored`` when present and fallbacks to ``bytes_used``
if not.
Closes-Bug: #1960206
Change-Id: I0ca25789a0b279d82f766091235f24f429405da6
(cherry picked from commit 86d9ec5d59
)
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@ -1925,6 +1925,51 @@ class RBDTestCase(test.TestCase):
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])
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self.assertEqual((free_capacity, total_capacity), result)
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@ddt.data(
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# Normal case, no quota and dynamic total
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{'free_capacity': 27.0, 'total_capacity': 28.44},
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# No quota and static total
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{'dynamic_total': False,
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'free_capacity': 27.0, 'total_capacity': 59.96},
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# Quota and dynamic total
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{'quota_max_bytes': 3221225472, 'max_avail': 1073741824,
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'free_capacity': 1, 'total_capacity': 2.44},
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# Quota and static total
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{'quota_max_bytes': 3221225472, 'max_avail': 1073741824,
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'dynamic_total': False,
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'free_capacity': 1, 'total_capacity': 3.00},
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# Quota and dynamic total when free would be negative
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{'quota_max_bytes': 1073741824,
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'free_capacity': 0, 'total_capacity': 1.44},
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)
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@ddt.unpack
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@common_mocks
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def test_get_pool_nautilus(self, free_capacity, total_capacity,
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max_avail=28987613184, quota_max_bytes=0,
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dynamic_total=True):
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client = self.mock_client.return_value
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client.__enter__.return_value = client
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client.cluster.mon_command.side_effect = [
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(0, '{"stats":{"total_bytes":64385286144,'
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'"total_used_bytes":3289628672,"total_avail_bytes":61095657472},'
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'"pools":[{"name":"rbd","id":2,"stats":{"kb_used":1510197,'
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'"stored":1546440971,"bytes_used":4639322913,"max_avail":%s,'
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'"objects":412}},{"name":"volumes","id":3,"stats":{"kb_used":0,'
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'"bytes_used":0,"max_avail":28987613184,"objects":0}}]}\n' %
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max_avail, ''),
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(0, '{"pool_name":"volumes","pool_id":4,"quota_max_objects":0,'
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'"quota_max_bytes":%s}\n' % quota_max_bytes, ''),
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]
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with mock.patch.object(self.driver.configuration, 'safe_get',
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return_value=dynamic_total):
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result = self.driver._get_pool_stats()
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client.cluster.mon_command.assert_has_calls([
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mock.call('{"prefix":"df", "format":"json"}', b''),
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mock.call('{"prefix":"osd pool get-quota", "pool": "rbd",'
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' "format":"json"}', b''),
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])
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self.assertEqual((free_capacity, total_capacity), result)
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@common_mocks
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def test_get_pool_bytes(self):
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"""Test for mon_commands returning bytes instead of strings."""
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@ -711,12 +711,15 @@ class RBDDriver(driver.CloneableImageVD, driver.MigrateVD,
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total_capacity: float
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free_capacity: float
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# In Nautilus bytes_used was renamed to stored
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bytes_used = pool_stats.get('stored', pool_stats['bytes_used'])
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quota_outbuf = encodeutils.safe_decode(quota_outbuf)
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bytes_quota = json.loads(quota_outbuf)['quota_max_bytes']
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# With quota the total is the quota limit and free is quota - used
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if bytes_quota:
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total_capacity = bytes_quota
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free_capacity = max(min(total_capacity - pool_stats['bytes_used'],
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free_capacity = max(min(total_capacity - bytes_used,
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pool_stats['max_avail']),
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0)
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# Without quota free is pools max available and total is global size
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@ -726,7 +729,7 @@ class RBDDriver(driver.CloneableImageVD, driver.MigrateVD,
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# If we want dynamic total capacity (default behavior)
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if self.configuration.safe_get('report_dynamic_total_capacity'):
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total_capacity = free_capacity + pool_stats['bytes_used']
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total_capacity = free_capacity + bytes_used
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free_capacity = round((float(free_capacity) / units.Gi), 2)
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total_capacity = round((float(total_capacity) / units.Gi), 2)
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@ -0,0 +1,8 @@
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---
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fixes:
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- |
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RBD driver `bug #1960206
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<https://bugs.launchpad.net/cinder/+bug/1960206>`_: Fixed
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``total_capacity`` reported by the driver to the scheduler on Ceph clusters
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that have renamed the ``bytes_used`` field to ``stored``. (e.g., `Nautilus
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<https://docs.ceph.com/en/nautilus/releases/nautilus/#upgrade-compatibility-notes>`_).
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