643 lines
28 KiB
Python
643 lines
28 KiB
Python
# Copyright 2013 IBM Corp.
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# Copyright 2012 OpenStack Foundation
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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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#
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"""
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Volume driver for IBM Storwize family and SVC storage systems.
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Notes:
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1. If you specify both a password and a key file, this driver will use the
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key file only.
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2. When using a key file for authentication, it is up to the user or
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system administrator to store the private key in a safe manner.
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3. The defaults for creating volumes are "-rsize 2% -autoexpand
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-grainsize 256 -warning 0". These can be changed in the configuration
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file or by using volume types(recommended only for advanced users).
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Limitations:
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1. The driver expects CLI output in English, error messages may be in a
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localized format.
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2. Clones and creating volumes from snapshots, where the source and target
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are of different sizes, is not supported.
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"""
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from oslo.config import cfg
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from cinder import context
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from cinder import exception
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from cinder.openstack.common import excutils
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from cinder.openstack.common import log as logging
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from cinder import units
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from cinder import utils
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from cinder.volume.drivers.ibm.storwize_svc import helpers as storwize_helpers
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from cinder.volume.drivers.san import san
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from cinder.volume import volume_types
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LOG = logging.getLogger(__name__)
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storwize_svc_opts = [
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cfg.StrOpt('storwize_svc_volpool_name',
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default='volpool',
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help='Storage system storage pool for volumes'),
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cfg.IntOpt('storwize_svc_vol_rsize',
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default=2,
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help='Storage system space-efficiency parameter for volumes '
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'(percentage)'),
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cfg.IntOpt('storwize_svc_vol_warning',
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default=0,
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help='Storage system threshold for volume capacity warnings '
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'(percentage)'),
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cfg.BoolOpt('storwize_svc_vol_autoexpand',
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default=True,
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help='Storage system autoexpand parameter for volumes '
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'(True/False)'),
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cfg.IntOpt('storwize_svc_vol_grainsize',
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default=256,
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help='Storage system grain size parameter for volumes '
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'(32/64/128/256)'),
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cfg.BoolOpt('storwize_svc_vol_compression',
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default=False,
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help='Storage system compression option for volumes'),
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cfg.BoolOpt('storwize_svc_vol_easytier',
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default=True,
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help='Enable Easy Tier for volumes'),
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cfg.IntOpt('storwize_svc_vol_iogrp',
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default=0,
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help='The I/O group in which to allocate volumes'),
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cfg.IntOpt('storwize_svc_flashcopy_timeout',
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default=120,
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help='Maximum number of seconds to wait for FlashCopy to be '
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'prepared. Maximum value is 600 seconds (10 minutes)'),
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cfg.StrOpt('storwize_svc_connection_protocol',
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default='iSCSI',
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help='Connection protocol (iSCSI/FC)'),
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cfg.BoolOpt('storwize_svc_iscsi_chap_enabled',
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default=True,
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help='Configure CHAP authentication for iSCSI connections '
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'(Default: Enabled)'),
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cfg.BoolOpt('storwize_svc_multipath_enabled',
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default=False,
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help='Connect with multipath (FC only; iSCSI multipath is '
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'controlled by Nova)'),
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cfg.BoolOpt('storwize_svc_multihostmap_enabled',
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default=True,
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help='Allows vdisk to multi host mapping'),
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]
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CONF = cfg.CONF
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CONF.register_opts(storwize_svc_opts)
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class StorwizeSVCDriver(san.SanDriver):
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"""IBM Storwize V7000 and SVC iSCSI/FC volume driver.
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Version history:
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1.0 - Initial driver
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1.1 - FC support, create_cloned_volume, volume type support,
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get_volume_stats, minor bug fixes
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1.2.0 - Added retype
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1.2.1 - Code refactor, improved exception handling
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1.2.2 - Fix bug #1274123 (races in host-related functions)
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"""
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VERSION = "1.2.2"
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def __init__(self, *args, **kwargs):
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super(StorwizeSVCDriver, self).__init__(*args, **kwargs)
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self.configuration.append_config_values(storwize_svc_opts)
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self._helpers = storwize_helpers.StorwizeHelpers(self._run_ssh)
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self._state = {'storage_nodes': {},
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'enabled_protocols': set(),
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'compression_enabled': False,
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'available_iogrps': [],
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'system_name': None,
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'system_id': None,
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'extent_size': None,
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'code_level': None,
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}
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def do_setup(self, ctxt):
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"""Check that we have all configuration details from the storage."""
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LOG.debug(_('enter: do_setup'))
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# Get storage system name, id, and code level
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self._state.update(self._helpers.get_system_info())
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# Validate that the pool exists
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pool = self.configuration.storwize_svc_volpool_name
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try:
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attributes = self._helpers.get_pool_attrs(pool)
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except exception.VolumeBackendAPIException:
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msg = _('Failed getting details for pool %s') % pool
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raise exception.InvalidInput(reason=msg)
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self._state['extent_size'] = attributes['extent_size']
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# Check if compression is supported
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self._state['compression_enabled'] = \
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self._helpers.compression_enabled()
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# Get the available I/O groups
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self._state['available_iogrps'] = \
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self._helpers.get_available_io_groups()
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# Get the iSCSI and FC names of the Storwize/SVC nodes
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self._state['storage_nodes'] = self._helpers.get_node_info()
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# Add the iSCSI IP addresses and WWPNs to the storage node info
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self._helpers.add_iscsi_ip_addrs(self._state['storage_nodes'])
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self._helpers.add_fc_wwpns(self._state['storage_nodes'])
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# For each node, check what connection modes it supports. Delete any
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# nodes that do not support any types (may be partially configured).
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to_delete = []
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for k, node in self._state['storage_nodes'].iteritems():
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if ((len(node['ipv4']) or len(node['ipv6']))
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and len(node['iscsi_name'])):
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node['enabled_protocols'].append('iSCSI')
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self._state['enabled_protocols'].add('iSCSI')
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if len(node['WWPN']):
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node['enabled_protocols'].append('FC')
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self._state['enabled_protocols'].add('FC')
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if not len(node['enabled_protocols']):
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to_delete.append(k)
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for delkey in to_delete:
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del self._state['storage_nodes'][delkey]
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# Make sure we have at least one node configured
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if not len(self._state['storage_nodes']):
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msg = _('do_setup: No configured nodes.')
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LOG.error(msg)
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raise exception.VolumeDriverException(message=msg)
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LOG.debug(_('leave: do_setup'))
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def check_for_setup_error(self):
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"""Ensure that the flags are set properly."""
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LOG.debug(_('enter: check_for_setup_error'))
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# Check that we have the system ID information
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if self._state['system_name'] is None:
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exception_msg = (_('Unable to determine system name'))
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raise exception.VolumeBackendAPIException(data=exception_msg)
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if self._state['system_id'] is None:
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exception_msg = (_('Unable to determine system id'))
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raise exception.VolumeBackendAPIException(data=exception_msg)
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if self._state['extent_size'] is None:
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exception_msg = (_('Unable to determine pool extent size'))
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raise exception.VolumeBackendAPIException(data=exception_msg)
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required_flags = ['san_ip', 'san_ssh_port', 'san_login',
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'storwize_svc_volpool_name']
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for flag in required_flags:
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if not self.configuration.safe_get(flag):
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raise exception.InvalidInput(reason=_('%s is not set') % flag)
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# Ensure that either password or keyfile were set
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if not (self.configuration.san_password or
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self.configuration.san_private_key):
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raise exception.InvalidInput(
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reason=_('Password or SSH private key is required for '
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'authentication: set either san_password or '
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'san_private_key option'))
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# Check that flashcopy_timeout is not more than 10 minutes
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flashcopy_timeout = self.configuration.storwize_svc_flashcopy_timeout
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if not (flashcopy_timeout > 0 and flashcopy_timeout <= 600):
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raise exception.InvalidInput(
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reason=_('Illegal value %d specified for '
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'storwize_svc_flashcopy_timeout: '
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'valid values are between 0 and 600')
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% flashcopy_timeout)
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opts = self._helpers.build_default_opts(self.configuration)
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self._helpers.check_vdisk_opts(self._state, opts)
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LOG.debug(_('leave: check_for_setup_error'))
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def ensure_export(self, ctxt, volume):
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"""Check that the volume exists on the storage.
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The system does not "export" volumes as a Linux iSCSI target does,
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and therefore we just check that the volume exists on the storage.
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"""
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volume_defined = self._helpers.is_vdisk_defined(volume['name'])
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if not volume_defined:
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LOG.error(_('ensure_export: Volume %s not found on storage')
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% volume['name'])
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def create_export(self, ctxt, volume):
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model_update = None
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return model_update
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def remove_export(self, ctxt, volume):
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pass
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def validate_connector(self, connector):
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"""Check connector for at least one enabled protocol (iSCSI/FC)."""
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valid = False
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if ('iSCSI' in self._state['enabled_protocols'] and
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'initiator' in connector):
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valid = True
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if 'FC' in self._state['enabled_protocols'] and 'wwpns' in connector:
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valid = True
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if not valid:
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msg = (_('The connector does not contain the required '
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'information.'))
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LOG.error(msg)
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raise exception.VolumeDriverException(message=msg)
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def _get_vdisk_params(self, type_id, volume_type=None):
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return self._helpers.get_vdisk_params(self.configuration, self._state,
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type_id, volume_type=volume_type)
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@utils.synchronized('storwize-host', external=True)
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def initialize_connection(self, volume, connector):
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"""Perform the necessary work so that an iSCSI/FC connection can
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be made.
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To be able to create an iSCSI/FC connection from a given host to a
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volume, we must:
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1. Translate the given iSCSI name or WWNN to a host name
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2. Create new host on the storage system if it does not yet exist
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3. Map the volume to the host if it is not already done
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4. Return the connection information for relevant nodes (in the
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proper I/O group)
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"""
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LOG.debug(_('enter: initialize_connection: volume %(vol)s with '
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'connector %(conn)s') % {'vol': str(volume),
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'conn': str(connector)})
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vol_opts = self._get_vdisk_params(volume['volume_type_id'])
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host_name = connector['host']
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volume_name = volume['name']
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# Check if a host object is defined for this host name
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host_name = self._helpers.get_host_from_connector(connector)
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if host_name is None:
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# Host does not exist - add a new host to Storwize/SVC
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host_name = self._helpers.create_host(connector)
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if vol_opts['protocol'] == 'iSCSI':
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chap_secret = self._helpers.get_chap_secret_for_host(host_name)
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chap_enabled = self.configuration.storwize_svc_iscsi_chap_enabled
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if chap_enabled and chap_secret is None:
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chap_secret = self._helpers.add_chap_secret_to_host(host_name)
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elif not chap_enabled and chap_secret:
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LOG.warning(_('CHAP secret exists for host but CHAP is '
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'disabled'))
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volume_attributes = self._helpers.get_vdisk_attributes(volume_name)
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if volume_attributes is None:
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msg = (_('initialize_connection: Failed to get attributes'
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' for volume %s') % volume_name)
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LOG.error(msg)
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raise exception.VolumeDriverException(message=msg)
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multihostmap = self.configuration.storwize_svc_multihostmap_enabled
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lun_id = self._helpers.map_vol_to_host(volume_name, host_name,
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multihostmap)
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try:
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preferred_node = volume_attributes['preferred_node_id']
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IO_group = volume_attributes['IO_group_id']
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except KeyError as e:
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LOG.error(_('Did not find expected column name in '
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'lsvdisk: %s') % str(e))
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msg = (_('initialize_connection: Missing volume '
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'attribute for volume %s') % volume_name)
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raise exception.VolumeBackendAPIException(data=msg)
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try:
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# Get preferred node and other nodes in I/O group
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preferred_node_entry = None
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io_group_nodes = []
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for node in self._state['storage_nodes'].itervalues():
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if vol_opts['protocol'] not in node['enabled_protocols']:
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continue
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if node['id'] == preferred_node:
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preferred_node_entry = node
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if node['IO_group'] == IO_group:
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io_group_nodes.append(node)
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if not len(io_group_nodes):
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msg = (_('initialize_connection: No node found in '
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'I/O group %(gid)s for volume %(vol)s') %
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{'gid': IO_group, 'vol': volume_name})
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LOG.error(msg)
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raise exception.VolumeBackendAPIException(data=msg)
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if not preferred_node_entry and not vol_opts['multipath']:
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# Get 1st node in I/O group
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preferred_node_entry = io_group_nodes[0]
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LOG.warn(_('initialize_connection: Did not find a preferred '
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'node for volume %s') % volume_name)
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properties = {}
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properties['target_discovered'] = False
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properties['target_lun'] = lun_id
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properties['volume_id'] = volume['id']
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if vol_opts['protocol'] == 'iSCSI':
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type_str = 'iscsi'
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if len(preferred_node_entry['ipv4']):
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ipaddr = preferred_node_entry['ipv4'][0]
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else:
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ipaddr = preferred_node_entry['ipv6'][0]
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properties['target_portal'] = '%s:%s' % (ipaddr, '3260')
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properties['target_iqn'] = preferred_node_entry['iscsi_name']
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if chap_secret:
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properties['auth_method'] = 'CHAP'
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properties['auth_username'] = connector['initiator']
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properties['auth_password'] = chap_secret
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else:
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type_str = 'fibre_channel'
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conn_wwpns = self._helpers.get_conn_fc_wwpns(host_name)
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if len(conn_wwpns) == 0:
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msg = (_('Could not get FC connection information for the '
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'host-volume connection. Is the host configured '
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'properly for FC connections?'))
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LOG.error(msg)
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raise exception.VolumeBackendAPIException(data=msg)
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if not vol_opts['multipath']:
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if preferred_node_entry['WWPN'] in conn_wwpns:
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properties['target_wwn'] = preferred_node_entry['WWPN']
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else:
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properties['target_wwn'] = conn_wwpns[0]
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else:
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properties['target_wwn'] = conn_wwpns
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except Exception:
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with excutils.save_and_reraise_exception():
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self.terminate_connection(volume, connector)
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LOG.error(_('initialize_connection: Failed to collect return '
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'properties for volume %(vol)s and connector '
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'%(conn)s.\n') % {'vol': str(volume),
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'conn': str(connector)})
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LOG.debug(_('leave: initialize_connection:\n volume: %(vol)s\n '
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'connector %(conn)s\n properties: %(prop)s')
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% {'vol': str(volume),
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'conn': str(connector),
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'prop': str(properties)})
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return {'driver_volume_type': type_str, 'data': properties, }
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@utils.synchronized('storwize-host', external=True)
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def terminate_connection(self, volume, connector, **kwargs):
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"""Cleanup after an iSCSI connection has been terminated.
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When we clean up a terminated connection between a given connector
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and volume, we:
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1. Translate the given connector to a host name
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2. Remove the volume-to-host mapping if it exists
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3. Delete the host if it has no more mappings (hosts are created
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automatically by this driver when mappings are created)
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"""
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LOG.debug(_('enter: terminate_connection: volume %(vol)s with '
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'connector %(conn)s') % {'vol': str(volume),
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'conn': str(connector)})
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vol_name = volume['name']
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if 'host' in connector:
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host_name = self._helpers.get_host_from_connector(connector)
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if host_name is None:
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msg = (_('terminate_connection: Failed to get host name from'
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' connector.'))
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LOG.error(msg)
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raise exception.VolumeDriverException(message=msg)
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else:
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# See bug #1244257
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host_name = None
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self._helpers.unmap_vol_from_host(vol_name, host_name)
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LOG.debug(_('leave: terminate_connection: volume %(vol)s with '
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'connector %(conn)s') % {'vol': str(volume),
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'conn': str(connector)})
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def create_volume(self, volume):
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opts = self._get_vdisk_params(volume['volume_type_id'])
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pool = self.configuration.storwize_svc_volpool_name
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return self._helpers.create_vdisk(volume['name'], str(volume['size']),
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'gb', pool, opts)
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def delete_volume(self, volume):
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self._helpers.delete_vdisk(volume['name'], False)
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def create_snapshot(self, snapshot):
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ctxt = context.get_admin_context()
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source_vol = self.db.volume_get(ctxt, snapshot['volume_id'])
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opts = self._get_vdisk_params(source_vol['volume_type_id'])
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self._helpers.create_copy(snapshot['volume_name'], snapshot['name'],
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snapshot['volume_id'], self.configuration,
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opts, False)
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def delete_snapshot(self, snapshot):
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self._helpers.delete_vdisk(snapshot['name'], False)
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def create_volume_from_snapshot(self, volume, snapshot):
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if volume['size'] != snapshot['volume_size']:
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msg = (_('create_volume_from_snapshot: Source and destination '
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'size differ.'))
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LOG.error(msg)
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raise exception.VolumeDriverException(message=msg)
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opts = self._get_vdisk_params(volume['volume_type_id'])
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self._helpers.create_copy(snapshot['name'], volume['name'],
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snapshot['id'], self.configuration,
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opts, True)
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def create_cloned_volume(self, tgt_volume, src_volume):
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if src_volume['size'] != tgt_volume['size']:
|
|
msg = (_('create_cloned_volume: Source and destination '
|
|
'size differ.'))
|
|
LOG.error(msg)
|
|
raise exception.VolumeDriverException(message=msg)
|
|
|
|
opts = self._get_vdisk_params(tgt_volume['volume_type_id'])
|
|
self._helpers.create_copy(src_volume['name'], tgt_volume['name'],
|
|
src_volume['id'], self.configuration,
|
|
opts, True)
|
|
|
|
def extend_volume(self, volume, new_size):
|
|
LOG.debug(_('enter: extend_volume: volume %s') % volume['id'])
|
|
ret = self._helpers.ensure_vdisk_no_fc_mappings(volume['name'],
|
|
allow_snaps=False)
|
|
if not ret:
|
|
msg = (_('extend_volume: Extending a volume with snapshots is not '
|
|
'supported.'))
|
|
LOG.error(msg)
|
|
raise exception.VolumeDriverException(message=msg)
|
|
|
|
extend_amt = int(new_size) - volume['size']
|
|
self._helpers.extend_vdisk(volume['name'], extend_amt)
|
|
LOG.debug(_('leave: extend_volume: volume %s') % volume['id'])
|
|
|
|
def migrate_volume(self, ctxt, volume, host):
|
|
"""Migrate directly if source and dest are managed by same storage.
|
|
|
|
The method uses the migratevdisk method, which returns almost
|
|
immediately, if the source and target pools have the same extent_size.
|
|
Otherwise, it uses addvdiskcopy and rmvdiskcopy, which require waiting
|
|
for the copy operation to complete.
|
|
|
|
:param ctxt: Context
|
|
:param volume: A dictionary describing the volume to migrate
|
|
:param host: A dictionary describing the host to migrate to, where
|
|
host['host'] is its name, and host['capabilities'] is a
|
|
dictionary of its reported capabilities.
|
|
"""
|
|
LOG.debug(_('enter: migrate_volume: id=%(id)s, host=%(host)s') %
|
|
{'id': volume['id'], 'host': host['host']})
|
|
|
|
false_ret = (False, None)
|
|
dest_pool = self._helpers.can_migrate_to_host(host, self._state)
|
|
if dest_pool is None:
|
|
return false_ret
|
|
|
|
if 'extent_size' not in host['capabilities']:
|
|
return false_ret
|
|
if host['capabilities']['extent_size'] == self._state['extent_size']:
|
|
# If source and dest pools have the same extent size, migratevdisk
|
|
self._helpers.migrate_vdisk(volume['name'], dest_pool)
|
|
else:
|
|
# If source and dest pool extent size differ, add/delete vdisk copy
|
|
ctxt = context.get_admin_context()
|
|
if volume['volume_type_id'] is not None:
|
|
volume_type_id = volume['volume_type_id']
|
|
vol_type = volume_types.get_volume_type(ctxt, volume_type_id)
|
|
else:
|
|
vol_type = None
|
|
self._helpers.migrate_volume_vdiskcopy(volume['name'], dest_pool,
|
|
vol_type,
|
|
self._state,
|
|
self.configuration)
|
|
|
|
LOG.debug(_('leave: migrate_volume: id=%(id)s, host=%(host)s') %
|
|
{'id': volume['id'], 'host': host['host']})
|
|
return (True, None)
|
|
|
|
def retype(self, ctxt, volume, new_type, diff, host):
|
|
"""Convert the volume to be of the new type.
|
|
|
|
Returns a boolean indicating whether the retype occurred.
|
|
|
|
:param ctxt: Context
|
|
:param volume: A dictionary describing the volume to migrate
|
|
:param new_type: A dictionary describing the volume type to convert to
|
|
:param diff: A dictionary with the difference between the two types
|
|
:param host: A dictionary describing the host to migrate to, where
|
|
host['host'] is its name, and host['capabilities'] is a
|
|
dictionary of its reported capabilities.
|
|
"""
|
|
LOG.debug(_('enter: retype: id=%(id)s, new_type=%(new_type)s,'
|
|
'diff=%(diff)s, host=%(host)s') % {'id': volume['id'],
|
|
'new_type': new_type,
|
|
'diff': diff,
|
|
'host': host})
|
|
|
|
ignore_keys = ['protocol', 'multipath']
|
|
no_copy_keys = ['warning', 'autoexpand', 'easytier', 'iogrp']
|
|
copy_keys = ['rsize', 'grainsize', 'compression']
|
|
all_keys = ignore_keys + no_copy_keys + copy_keys
|
|
old_opts = self._get_vdisk_params(volume['volume_type_id'])
|
|
new_opts = self._get_vdisk_params(new_type['id'],
|
|
volume_type=new_type)
|
|
|
|
vdisk_changes = []
|
|
need_copy = False
|
|
for key in all_keys:
|
|
if old_opts[key] != new_opts[key]:
|
|
if key in copy_keys:
|
|
need_copy = True
|
|
break
|
|
elif key in no_copy_keys:
|
|
vdisk_changes.append(key)
|
|
|
|
dest_location = host['capabilities'].get('location_info')
|
|
if self._stats['location_info'] != dest_location:
|
|
need_copy = True
|
|
|
|
if need_copy:
|
|
dest_pool = self._helpers.can_migrate_to_host(host, self._state)
|
|
if dest_pool is None:
|
|
return False
|
|
|
|
self._helpers.migrate_volume_vdiskcopy(volume['name'], dest_pool,
|
|
new_type,
|
|
self._state,
|
|
self.configuration)
|
|
else:
|
|
self._helpers.change_vdisk_options(volume['name'], vdisk_changes,
|
|
new_opts, self._state)
|
|
|
|
LOG.debug(_('exit: retype: ild=%(id)s, new_type=%(new_type)s,'
|
|
'diff=%(diff)s, host=%(host)s') % {'id': volume['id'],
|
|
'new_type': new_type,
|
|
'diff': diff,
|
|
'host': host['host']})
|
|
return True
|
|
|
|
def get_volume_stats(self, refresh=False):
|
|
"""Get volume stats.
|
|
|
|
If we haven't gotten stats yet or 'refresh' is True,
|
|
run update the stats first.
|
|
"""
|
|
if not self._stats or refresh:
|
|
self._update_volume_stats()
|
|
|
|
return self._stats
|
|
|
|
def _update_volume_stats(self):
|
|
"""Retrieve stats info from volume group."""
|
|
|
|
LOG.debug(_("Updating volume stats"))
|
|
data = {}
|
|
|
|
data['vendor_name'] = 'IBM'
|
|
data['driver_version'] = self.VERSION
|
|
data['storage_protocol'] = list(self._state['enabled_protocols'])
|
|
|
|
data['total_capacity_gb'] = 0 # To be overwritten
|
|
data['free_capacity_gb'] = 0 # To be overwritten
|
|
data['reserved_percentage'] = self.configuration.reserved_percentage
|
|
data['QoS_support'] = False
|
|
|
|
pool = self.configuration.storwize_svc_volpool_name
|
|
backend_name = self.configuration.safe_get('volume_backend_name')
|
|
if not backend_name:
|
|
backend_name = '%s_%s' % (self._state['system_name'], pool)
|
|
data['volume_backend_name'] = backend_name
|
|
|
|
attributes = self._helpers.get_pool_attrs(pool)
|
|
if not attributes:
|
|
LOG.error(_('Could not get pool data from the storage'))
|
|
exception_message = (_('_update_volume_stats: '
|
|
'Could not get storage pool data'))
|
|
raise exception.VolumeBackendAPIException(data=exception_message)
|
|
|
|
data['total_capacity_gb'] = (float(attributes['capacity']) /
|
|
units.GiB)
|
|
data['free_capacity_gb'] = (float(attributes['free_capacity']) /
|
|
units.GiB)
|
|
data['easytier_support'] = attributes['easy_tier'] in ['on', 'auto']
|
|
data['compression_support'] = self._state['compression_enabled']
|
|
data['extent_size'] = self._state['extent_size']
|
|
data['location_info'] = ('StorwizeSVCDriver:%(sys_id)s:%(pool)s' %
|
|
{'sys_id': self._state['system_id'],
|
|
'pool': pool})
|
|
|
|
self._stats = data
|