292 lines
10 KiB
Python
292 lines
10 KiB
Python
# Copyright (c) 2012 - 2014 EMC Corporation.
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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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ISCSI Drivers for EMC VMAX arrays based on SMI-S.
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"""
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import six
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from cinder import context
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from cinder import exception
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from cinder.i18n import _
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from cinder.openstack.common import log as logging
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from cinder.volume import driver
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from cinder.volume.drivers.emc import emc_vmax_common
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LOG = logging.getLogger(__name__)
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class EMCVMAXISCSIDriver(driver.ISCSIDriver):
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"""EMC ISCSI Drivers for VMAX using SMI-S.
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Version history:
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1.0.0 - Initial driver
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1.1.0 - Multiple pools and thick/thin provisioning,
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performance enhancement.
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2.0.0 - Add driver requirement functions
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"""
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VERSION = "2.0.0"
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def __init__(self, *args, **kwargs):
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super(EMCVMAXISCSIDriver, self).__init__(*args, **kwargs)
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self.common =\
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emc_vmax_common.EMCVMAXCommon('iSCSI',
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configuration=self.configuration)
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def check_for_setup_error(self):
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pass
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def create_volume(self, volume):
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"""Creates a EMC(VMAX/VNX) volume."""
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volpath = self.common.create_volume(volume)
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model_update = {}
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volume['provider_location'] = six.text_type(volpath)
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model_update['provider_location'] = volume['provider_location']
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return model_update
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def create_volume_from_snapshot(self, volume, snapshot):
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"""Creates a volume from a snapshot."""
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volpath = self.common.create_volume_from_snapshot(volume, snapshot)
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model_update = {}
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volume['provider_location'] = six.text_type(volpath)
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model_update['provider_location'] = volume['provider_location']
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return model_update
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def create_cloned_volume(self, volume, src_vref):
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"""Creates a cloned volume."""
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volpath = self.common.create_cloned_volume(volume, src_vref)
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model_update = {}
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volume['provider_location'] = six.text_type(volpath)
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model_update['provider_location'] = volume['provider_location']
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return model_update
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def delete_volume(self, volume):
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"""Deletes an EMC volume."""
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self.common.delete_volume(volume)
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def create_snapshot(self, snapshot):
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"""Creates a snapshot."""
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ctxt = context.get_admin_context()
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volumename = snapshot['volume_name']
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index = volumename.index('-')
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volumeid = volumename[index + 1:]
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volume = self.db.volume_get(ctxt, volumeid)
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volpath = self.common.create_snapshot(snapshot, volume)
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model_update = {}
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snapshot['provider_location'] = six.text_type(volpath)
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model_update['provider_location'] = snapshot['provider_location']
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return model_update
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def delete_snapshot(self, snapshot):
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"""Deletes a snapshot."""
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ctxt = context.get_admin_context()
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volumename = snapshot['volume_name']
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index = volumename.index('-')
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volumeid = volumename[index + 1:]
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volume = self.db.volume_get(ctxt, volumeid)
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self.common.delete_snapshot(snapshot, volume)
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def ensure_export(self, context, volume):
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"""Driver entry point to get the export info for an existing volume."""
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pass
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def create_export(self, context, volume):
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"""Driver entry point to get the export info for a new volume."""
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pass
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def remove_export(self, context, volume):
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"""Driver entry point to remove an export for a volume."""
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pass
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def check_for_export(self, context, volume_id):
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"""Make sure volume is exported."""
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pass
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def initialize_connection(self, volume, connector):
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"""Initializes the connection and returns connection info.
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The iscsi driver returns a driver_volume_type of 'iscsi'.
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the format of the driver data is defined in smis_get_iscsi_properties.
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Example return value::
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{
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'driver_volume_type': 'iscsi'
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'data': {
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'target_discovered': True,
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'target_iqn': 'iqn.2010-10.org.openstack:volume-00000001',
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'target_portal': '127.0.0.0.1:3260',
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'volume_id': '12345678-1234-4321-1234-123456789012',
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}
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}
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"""
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devInfo, ipAddress = self.common.initialize_connection(
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volume, connector)
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iscsi_properties = self.smis_get_iscsi_properties(
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volume, connector, ipAddress)
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LOG.info(_("Leaving initialize_connection: %s") % (iscsi_properties))
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return {
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'driver_volume_type': 'iscsi',
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'data': iscsi_properties
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}
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def smis_do_iscsi_discovery(self, volume, ipAddress):
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LOG.warn(_("ISCSI provider_location not stored, using discovery"))
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(out, _err) = self._execute('iscsiadm', '-m', 'discovery',
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'-t', 'sendtargets', '-p',
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ipAddress,
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run_as_root=True)
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LOG.info(_(
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"smis_do_iscsi_discovery is: %(out)s")
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% {'out': out})
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targets = []
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for target in out.splitlines():
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targets.append(target)
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return targets
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def smis_get_iscsi_properties(self, volume, connector, ipAddress):
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"""Gets iscsi configuration.
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We ideally get saved information in the volume entity, but fall back
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to discovery if need be. Discovery may be completely removed in future
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The properties are:
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:target_discovered: boolean indicating whether discovery was used
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:target_iqn: the IQN of the iSCSI target
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:target_portal: the portal of the iSCSI target
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:target_lun: the lun of the iSCSI target
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:volume_id: the UUID of the volume
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:auth_method:, :auth_username:, :auth_password:
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the authentication details. Right now, either auth_method is not
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present meaning no authentication, or auth_method == `CHAP`
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meaning use CHAP with the specified credentials.
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"""
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properties = {}
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location = self.smis_do_iscsi_discovery(volume, ipAddress)
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if not location:
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raise exception.InvalidVolume(_("Could not find iSCSI export "
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" for volume %(volumeName)s")
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% {'volumeName': volume['name']})
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LOG.debug("ISCSI Discovery: Found %s" % (location))
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properties['target_discovered'] = True
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device_info = self.common.find_device_number(volume, connector)
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if device_info is None or device_info['hostlunid'] is None:
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exception_message = (_("Cannot find device number for volume "
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"%(volumeName)s")
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% {'volumeName': volume['name']})
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raise exception.VolumeBackendAPIException(data=exception_message)
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device_number = device_info['hostlunid']
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LOG.info(_(
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"location is: %(location)s") % {'location': location})
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for loc in location:
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results = loc.split(" ")
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properties['target_portal'] = results[0].split(",")[0]
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properties['target_iqn'] = results[1]
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properties['target_lun'] = device_number
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properties['volume_id'] = volume['id']
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LOG.info(_("ISCSI properties: %(properties)s")
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% {'properties': properties})
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LOG.info(_("ISCSI volume is: %(volume)s")
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% {'volume': volume})
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if 'provider_auth' in volume:
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auth = volume['provider_auth']
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LOG.info(_("AUTH properties: %(authProps)s")
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% {'authProps': auth})
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if auth is not None:
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(auth_method, auth_username, auth_secret) = auth.split()
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properties['auth_method'] = auth_method
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properties['auth_username'] = auth_username
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properties['auth_password'] = auth_secret
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LOG.info(_("AUTH properties: %s") % (properties))
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return properties
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def terminate_connection(self, volume, connector, **kwargs):
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"""Disallow connection from connector."""
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self.common.terminate_connection(volume, connector)
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def extend_volume(self, volume, new_size):
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"""Extend an existing volume."""
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self.common.extend_volume(volume, new_size)
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def get_volume_stats(self, refresh=False):
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"""Get volume stats.
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If 'refresh' is True, run update the stats first.
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"""
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if refresh:
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self.update_volume_stats()
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return self._stats
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def update_volume_stats(self):
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"""Retrieve stats info from volume group."""
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LOG.debug("Updating volume stats")
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data = self.common.update_volume_stats()
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data['storage_protocol'] = 'iSCSI'
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data['driver_version'] = self.VERSION
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self._stats = data
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def migrate_volume(self, ctxt, volume, host):
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"""Migrate a volume from one Volume Backend to another.
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:param self: reference to class
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:param ctxt:
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:param volume: the volume object including the volume_type_id
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:param host: the host dict holding the relevant target(destination)
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information
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:returns: moved
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:returns: list
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"""
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return self.common.migrate_volume(ctxt, volume, host)
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def retype(self, ctxt, volume, new_type, diff, host):
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"""Migrate volume to another host using retype.
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:param self: reference to class
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:param ctxt:
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:param volume: the volume object including the volume_type_id
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:param new_type: the new volume type.
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:param host: the host dict holding the relevant target(destination)
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information
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:returns: moved
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{}
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"""
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return self.common.retype(ctxt, volume, new_type, diff, host)
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