55 lines
2.1 KiB
Python
55 lines
2.1 KiB
Python
# Copyright (c) 2012 OpenStack, LLC.
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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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from nova import flags
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from nova.openstack.common import cfg
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from nova.openstack.common import log as logging
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from nova.scheduler import filters
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LOG = logging.getLogger(__name__)
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disk_allocation_ratio_opt = cfg.FloatOpt("disk_allocation_ratio", default=1.0,
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help="virtual disk to physical disk allocation ratio")
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FLAGS = flags.FLAGS
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FLAGS.register_opt(disk_allocation_ratio_opt)
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class DiskFilter(filters.BaseHostFilter):
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"""Disk Filter with over subscription flag"""
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def host_passes(self, host_state, filter_properties):
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"""Filter based on disk usage"""
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instance_type = filter_properties.get('instance_type')
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requested_disk = 1024 * (instance_type['root_gb'] +
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instance_type['ephemeral_gb'])
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free_disk_mb = host_state.free_disk_mb
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total_usable_disk_mb = host_state.total_usable_disk_gb * 1024
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disk_mb_limit = total_usable_disk_mb * FLAGS.disk_allocation_ratio
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used_disk_mb = total_usable_disk_mb - free_disk_mb
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usable_disk_mb = disk_mb_limit - used_disk_mb
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if not usable_disk_mb >= requested_disk:
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LOG.debug(_("%(host_state)s does not have %(requested_disk)s MB "
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"usable disk, it only has %(usable_disk_mb)s MB usable "
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"disk."), locals())
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return False
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disk_gb_limit = disk_mb_limit / 1024
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host_state.limits['disk_gb'] = disk_gb_limit
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return True
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