67 lines
2.9 KiB
Python
67 lines
2.9 KiB
Python
# Copyright (c) 2010 OpenStack Foundation
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# Copyright 2010 United States Government as represented by the
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# Administrator of the National Aeronautics and Space Administration.
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# All Rights Reserved.
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#
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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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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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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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# under the License.
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"""
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Chance and Simple Scheduler are DEPRECATED.
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Chance and Simple scheduler implementation have been deprecated, as their
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functionality can be implemented using the FilterScheduler, here's how:
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If one would like to have scheduler randomly picks available back-end
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(like ChanceScheduler did), use FilterScheduler with following combination
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of filters and weighers.
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scheduler_driver = cinder.scheduler.filter_scheduler.FilterScheduler
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scheduler_default_filters = ['AvailabilityZoneFilter', 'CapacityFilter',
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'CapabilitiesFilter']
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scheduler_default_weighers = 'ChanceWeigher'
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If one prefers the scheduler to pick up the back-end has most available
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space that scheduler can see (like SimpleScheduler did), use following
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combination of filters and weighers with FilterScheduler.
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scheduler_driver = cinder.scheduler.filter_scheduler.FilterScheduler
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scheduler_default_filters = ['AvailabilityZoneFilter', 'CapacityFilter',
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'CapabilitiesFilter']
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scheduler_default_weighers = 'AllocatedCapacityWeigher'
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allocated_capacity_weight_multiplier = -1.0
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Setting/leaving configure option
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'scheduler_driver=cinder.scheduler.chance.ChanceScheduler' or
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'scheduler_driver=cinder.scheduler.simple.SimpleScheduler' in cinder.conf
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works exactly the same as described above since scheduler manager has been
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updated to do the trick internally/transparently for users.
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With that, FilterScheduler behaves mostly the same as Chance/SimpleScheduler,
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with additional benefits of supporting volume types, volume encryption, QoS.
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"""
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from oslo.config import cfg
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simple_scheduler_opts = [
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cfg.IntOpt("max_gigabytes",
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default=10000,
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help="This configure option has been deprecated along with "
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"the SimpleScheduler. New scheduler is able to gather "
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"capacity information for each host, thus setting the "
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"maximum number of volume gigabytes for host is no "
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"longer needed. It's safe to remove this configure "
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"from cinder.conf."), ]
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CONF = cfg.CONF
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CONF.register_opts(simple_scheduler_opts)
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