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OpenStack Study: io_ops_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__) max_io_ops_per_host_opt = cfg.IntOpt("max_io_ops_per_host", default=8, help="Ignore hosts that have too many builds/resizes/snaps/migrations") CONF = cfg.CONF CONF.register_opt(max_io_ops_per_host_opt)
**** CubicPower OpenStack Study **** class IoOpsFilter(filters.BaseHostFilter): """Filter out hosts with too many concurrent I/O operations."""
**** CubicPower OpenStack Study **** def host_passes(self, host_state, filter_properties): """Use information about current vm and task states collected from compute node statistics to decide whether to filter. """ num_io_ops = host_state.num_io_ops max_io_ops = CONF.max_io_ops_per_host passes = num_io_ops < max_io_ops if not passes: LOG.debug(_("%(host_state)s fails I/O ops check: Max IOs per host " "is set to %(max_io_ops)s"), {'host_state': host_state, 'max_io_ops': max_io_ops}) return passes
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