197 lines
9.2 KiB
Python
197 lines
9.2 KiB
Python
# Copyright (c) 2012 Intel
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# Copyright (c) 2012 OpenStack Foundation
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# Copyright (c) 2015 EMC Corporation
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#
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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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import math
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from oslo_log import log as logging
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from cinder.scheduler import filters
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LOG = logging.getLogger(__name__)
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class CapacityFilter(filters.BaseBackendFilter):
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"""Capacity filters based on volume backend's capacity utilization."""
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def backend_passes(self, backend_state, filter_properties):
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"""Return True if host has sufficient capacity."""
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volid = None
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# If the volume already exists on this host, don't fail it for
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# insufficient capacity (e.g., if we are retyping)
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if backend_state.backend_id == filter_properties.get('vol_exists_on'):
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return True
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spec = filter_properties.get('request_spec')
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if spec:
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volid = spec.get('volume_id')
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grouping = 'cluster' if backend_state.cluster_name else 'host'
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if filter_properties.get('new_size'):
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# If new_size is passed, we are allocating space to extend a volume
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requested_size = (int(filter_properties.get('new_size')) -
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int(filter_properties.get('size')))
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LOG.debug('Checking if %(grouping)s %(grouping_name)s can extend '
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'the volume %(id)s in %(size)s GB',
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{'grouping': grouping,
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'grouping_name': backend_state.backend_id, 'id': volid,
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'size': requested_size})
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else:
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requested_size = filter_properties.get('size')
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LOG.debug('Checking if %(grouping)s %(grouping_name)s can create '
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'a %(size)s GB volume (%(id)s)',
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{'grouping': grouping,
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'grouping_name': backend_state.backend_id, 'id': volid,
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'size': requested_size})
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# requested_size is 0 means that it's a manage request.
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if requested_size == 0:
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return True
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if backend_state.free_capacity_gb is None:
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# Fail Safe
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LOG.error("Free capacity not set: "
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"volume node info collection broken.")
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return False
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free_space = backend_state.free_capacity_gb
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total_space = backend_state.total_capacity_gb
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reserved = float(backend_state.reserved_percentage) / 100
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if free_space in ['infinite', 'unknown']:
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# NOTE(zhiteng) for those back-ends cannot report actual
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# available capacity, we assume it is able to serve the
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# request. Even if it was not, the retry mechanism is
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# able to handle the failure by rescheduling
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return True
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elif total_space in ['infinite', 'unknown']:
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# If total_space is 'infinite' or 'unknown' and reserved
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# is 0, we assume the back-ends can serve the request.
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# If total_space is 'infinite' or 'unknown' and reserved
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# is not 0, we cannot calculate the reserved space.
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# float(total_space) will throw an exception. total*reserved
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# also won't work. So the back-ends cannot serve the request.
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if reserved == 0:
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return True
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LOG.debug("Cannot calculate GB of reserved space (%s%%) with "
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"backend's reported total capacity '%s'",
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backend_state.reserved_percentage, total_space)
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return False
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total = float(total_space)
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if total <= 0:
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LOG.warning("Insufficient free space for volume creation. "
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"Total capacity is %(total).2f on %(grouping)s "
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"%(grouping_name)s.",
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{"total": total,
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"grouping": grouping,
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"grouping_name": backend_state.backend_id})
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return False
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# Calculate how much free space is left after taking into account
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# the reserved space.
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free = free_space - math.floor(total * reserved)
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# NOTE(xyang): If 'provisioning:type' is 'thick' in extra_specs,
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# we will not use max_over_subscription_ratio and
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# provisioned_capacity_gb to determine whether a volume can be
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# provisioned. Instead free capacity will be used to evaluate.
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thin = True
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vol_type = filter_properties.get('volume_type', {}) or {}
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provision_type = vol_type.get('extra_specs', {}).get(
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'provisioning:type')
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if provision_type == 'thick':
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thin = False
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msg_args = {"grouping_name": backend_state.backend_id,
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"grouping": grouping,
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"requested": requested_size,
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"available": free}
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# Only evaluate using max_over_subscription_ratio if
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# thin_provisioning_support is True. Check if the ratio of
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# provisioned capacity over total capacity has exceeded over
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# subscription ratio.
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if (thin and backend_state.thin_provisioning_support and
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backend_state.max_over_subscription_ratio >= 1):
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provisioned_ratio = ((backend_state.provisioned_capacity_gb +
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requested_size) / total)
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LOG.debug("Checking provisioning for request of %s GB. "
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"Backend: %s", requested_size, backend_state)
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if provisioned_ratio > backend_state.max_over_subscription_ratio:
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msg_args = {
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"provisioned_ratio": provisioned_ratio,
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"oversub_ratio": backend_state.max_over_subscription_ratio,
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"grouping": grouping,
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"grouping_name": backend_state.backend_id,
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}
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LOG.warning(
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"Insufficient free space for thin provisioning. "
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"The ratio of provisioned capacity over total capacity "
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"%(provisioned_ratio).2f has exceeded the maximum over "
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"subscription ratio %(oversub_ratio).2f on %(grouping)s "
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"%(grouping_name)s.", msg_args)
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return False
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else:
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# Thin provisioning is enabled and projected over-subscription
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# ratio does not exceed max_over_subscription_ratio. The host
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# passes if "adjusted" free virtual capacity is enough to
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# accommodate the volume. Adjusted free virtual capacity is
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# the currently available free capacity (taking into account
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# of reserved space) which we can over-subscribe.
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adjusted_free_virtual = (
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free * backend_state.max_over_subscription_ratio)
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res = adjusted_free_virtual >= requested_size
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if not res:
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msg_args = {"available": adjusted_free_virtual,
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"size": requested_size,
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"grouping": grouping,
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"grouping_name": backend_state.backend_id}
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LOG.warning("Insufficient free virtual space "
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"(%(available)sGB) to accommodate thin "
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"provisioned %(size)sGB volume on %(grouping)s"
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" %(grouping_name)s.", msg_args)
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else:
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LOG.debug("Space information for volume creation "
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"on %(grouping)s %(grouping_name)s "
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"(requested / avail): "
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"%(requested)s/%(available)s", msg_args)
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return res
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elif thin and backend_state.thin_provisioning_support:
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LOG.warning("Filtering out %(grouping)s %(grouping_name)s "
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"with an invalid maximum over subscription ratio "
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"of %(oversub_ratio).2f. The ratio should be a "
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"minimum of 1.0.",
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{"oversub_ratio":
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backend_state.max_over_subscription_ratio,
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"grouping": grouping,
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"grouping_name": backend_state.backend_id})
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return False
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if free < requested_size:
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LOG.warning("Insufficient free space for volume creation "
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"on %(grouping)s %(grouping_name)s (requested / "
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"avail): %(requested)s/%(available)s",
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msg_args)
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return False
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LOG.debug("Space information for volume creation "
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"on %(grouping)s %(grouping_name)s (requested / avail): "
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"%(requested)s/%(available)s", msg_args)
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return True
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