aed12ab5b3
This commit adds support for logical disks to share physical disks if explicitly requested. Implements: blueprint hpssa-support Change-Id: I379a199726e81b37456d4ec2d413aa6e65f20174
117 lines
5.0 KiB
Python
117 lines
5.0 KiB
Python
# Copyright 2015 Hewlett-Packard Development Company, L.P.
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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 proliantutils import exception
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from proliantutils.hpssa import constants
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FILTER_CRITERIA = ['disk_type', 'interface_type', 'model', 'firmware']
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def _get_criteria_matching_disks(logical_disk, physical_drives):
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"""Finds the physical drives matching the criteria of logical disk.
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This method finds the physical drives matching the criteria
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of the logical disk passed.
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:param logical_disk: The logical disk dictionary from raid config
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:param physical_drives: The physical drives to consider.
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:returns: A list of physical drives which match the criteria
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"""
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matching_physical_drives = []
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criteria_to_consider = [x for x in FILTER_CRITERIA
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if x in logical_disk]
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for physical_drive_object in physical_drives:
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for criteria in criteria_to_consider:
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logical_drive_value = logical_disk.get(criteria)
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physical_drive_value = getattr(physical_drive_object, criteria)
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if logical_drive_value != physical_drive_value:
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break
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else:
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matching_physical_drives.append(physical_drive_object)
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return matching_physical_drives
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def allocate_disks(logical_disk, server, raid_config):
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"""Allocate physical disks to a logical disk.
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This method allocated physical disks to a logical
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disk based on the current state of the server and
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criteria mentioned in the logical disk.
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:param logical_disk: a dictionary of a logical disk
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from the RAID configuration input to the module.
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:param server: An objects.Server object
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:param raid_config: The target RAID configuration requested.
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:raises: PhysicalDisksNotFoundError, if cannot find
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physical disks for the request.
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"""
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size_gb = logical_disk['size_gb']
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raid_level = logical_disk['raid_level']
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number_of_physical_disks = logical_disk.get(
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'number_of_physical_disks', constants.RAID_LEVEL_MIN_DISKS[raid_level])
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share_physical_disks = logical_disk.get('share_physical_disks', False)
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# Try to create a new independent array for this request.
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for controller in server.controllers:
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physical_drives = controller.unassigned_physical_drives
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physical_drives = _get_criteria_matching_disks(logical_disk,
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physical_drives)
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physical_drives = [x for x in physical_drives
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if x.size_gb >= size_gb]
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if len(physical_drives) >= number_of_physical_disks:
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selected_drives = sorted(physical_drives, key=lambda x: x.size_gb)
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selected_drive_ids = [x.id for x in selected_drives]
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logical_disk['controller'] = controller.id
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physical_disks = selected_drive_ids[:number_of_physical_disks]
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logical_disk['physical_disks'] = physical_disks
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return
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# We didn't find physical disks to create an independent array.
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# Check if we can get some shared arrays.
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if share_physical_disks:
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sharable_disk_wwns = []
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for sharable_logical_disk in raid_config['logical_disks']:
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if (sharable_logical_disk.get('share_physical_disks', False) and
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'root_device_hint' in sharable_logical_disk):
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wwn = sharable_logical_disk['root_device_hint']['wwn']
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sharable_disk_wwns.append(wwn)
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for controller in server.controllers:
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sharable_arrays = [x for x in controller.raid_arrays if
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x.logical_drives[0].wwn in sharable_disk_wwns]
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for array in sharable_arrays:
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# Check if criterias for the logical disk match the ones with
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# physical disks in the raid array.
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criteria_matched_disks = _get_criteria_matching_disks(
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logical_disk, array.physical_drives)
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# Check if all disks in the array don't match the criteria
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if len(criteria_matched_disks) != len(array.physical_drives):
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continue
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# Check if raid array can accomodate the logical disk.
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if array.can_accomodate(logical_disk):
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logical_disk['controller'] = controller.id
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logical_disk['array'] = array.id
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return
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# We check both options and couldn't get any physical disks.
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raise exception.PhysicalDisksNotFoundError(size_gb=size_gb,
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raid_level=raid_level)
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