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# Copyright (c) 2012 OpenStack, LLC.
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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# http://www.apache.org/licenses/LICENSE-2.0
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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Capacity Weigher. Weigh hosts by their available capacity.
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The default is to spread volumes across all hosts evenly. If you prefer
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stacking, you can set the 'capacity_weight_multiplier' option to a negative
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number and the weighing has the opposite effect of the default.
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from cinder import flags
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from cinder.openstack.common import cfg
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from cinder.openstack.common.scheduler import weights
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capacity_weight_opts = [
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cfg.FloatOpt('capacity_weight_multiplier',
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help='Multiplier used for weighing volume capacity. '
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'Negative numbers mean to stack vs spread.'),
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FLAGS.register_opts(capacity_weight_opts)
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class CapacityWeigher(weights.BaseHostWeigher):
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def _weight_multiplier(self):
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"""Override the weight multiplier."""
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return FLAGS.capacity_weight_multiplier
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def _weigh_object(self, host_state, weight_properties):
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"""Higher weights win. We want spreading to be the default."""
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reserved = float(host_state.reserved_percentage) / 100
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free = math.floor(host_state.free_capacity_gb * (1 - reserved))
added
removed
cinder/scheduler/weights/capacity.py
