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OpenStack Study: disk_filter.py**** CubicPower OpenStack Study ****
# Copyright (c) 2012 OpenStack Foundation # All Rights Reserved. # # Licensed under the Apache License, Version 2.0 (the "License"); you may # not use this file except in compliance with the License. You may obtain # a copy of the License at # # http://www.apache.org/licenses/LICENSE-2.0 # # Unless required by applicable law or agreed to in writing, software # distributed under the License is distributed on an "AS IS" BASIS, WITHOUT # WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the # License for the specific language governing permissions and limitations # under the License. from oslo.config import cfg from nova.openstack.common.gettextutils import _ from nova.openstack.common import log as logging from nova.scheduler import filters LOG = logging.getLogger(__name__) disk_allocation_ratio_opt = cfg.FloatOpt("disk_allocation_ratio", default=1.0, help="Virtual disk to physical disk allocation ratio") CONF = cfg.CONF CONF.register_opt(disk_allocation_ratio_opt)
**** CubicPower OpenStack Study **** class DiskFilter(filters.BaseHostFilter): """Disk Filter with over subscription flag."""
**** CubicPower OpenStack Study **** def host_passes(self, host_state, filter_properties): """Filter based on disk usage.""" instance_type = filter_properties.get('instance_type') requested_disk = (1024 * (instance_type['root_gb'] + instance_type['ephemeral_gb']) + instance_type['swap']) free_disk_mb = host_state.free_disk_mb total_usable_disk_mb = host_state.total_usable_disk_gb * 1024 disk_mb_limit = total_usable_disk_mb * CONF.disk_allocation_ratio used_disk_mb = total_usable_disk_mb - free_disk_mb usable_disk_mb = disk_mb_limit - used_disk_mb if not usable_disk_mb >= requested_disk: LOG.debug(_("%(host_state)s does not have %(requested_disk)s MB " "usable disk, it only has %(usable_disk_mb)s MB usable " "disk."), {'host_state': host_state, 'requested_disk': requested_disk, 'usable_disk_mb': usable_disk_mb}) return False disk_gb_limit = disk_mb_limit / 1024 host_state.limits['disk_gb'] = disk_gb_limit return True
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