243 lines
8.4 KiB
Python
243 lines
8.4 KiB
Python
# vim: tabstop=4 shiftwidth=4 softtabstop=4
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# Copyright (c) 2012 EMC Corporation.
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# Copyright (c) 2012 OpenStack LLC.
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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 VNX and VMAX arrays based on SMI-S.
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"""
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from cinder import exception
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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_smis_common
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LOG = logging.getLogger(__name__)
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class EMCSMISISCSIDriver(driver.ISCSIDriver):
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"""EMC ISCSI Drivers for VMAX and VNX using SMI-S."""
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VERSION = "1.0.0"
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def __init__(self, *args, **kwargs):
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super(EMCSMISISCSIDriver, self).__init__(*args, **kwargs)
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self.common =\
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emc_smis_common.EMCSMISCommon('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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self.common.create_volume(volume)
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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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self.common.create_volume_from_snapshot(volume, snapshot)
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def create_cloned_volume(self, volume, src_vref):
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"""Creates a cloned volume."""
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self.common.create_cloned_volume(volume, src_vref)
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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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self.common.create_snapshot(snapshot)
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def delete_snapshot(self, snapshot):
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"""Deletes a snapshot."""
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self.common.delete_snapshot(snapshot)
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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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return self.common.create_export(context, volume)
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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 _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': 1,
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}
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}
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"""
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self.common.initialize_connection(volume, connector)
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iscsi_properties = self._get_iscsi_properties(volume)
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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 _do_iscsi_discovery(self, volume):
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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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self.configuration.iscsi_ip_address,
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run_as_root=True)
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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 _get_iscsi_properties(self, volume):
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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 id of the volume (currently used by xen)
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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._do_iscsi_discovery(volume)
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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 %s") %
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(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)
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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 %s")
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% 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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storage_system = device_info['storagesystem']
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# sp is "SP_A" or "SP_B"
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sp = device_info['owningsp']
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endpoints = []
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if sp:
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# endpointss example:
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# [iqn.1992-04.com.emc:cx.apm00123907237.a8,
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# iqn.1992-04.com.emc:cx.apm00123907237.a9]
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endpoints = self.common._find_iscsi_protocol_endpoints(
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sp, storage_system)
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foundEndpoint = False
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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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# owning sp is None for VMAX
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# for VNX, find the target_iqn that matches the endpoint
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# target_iqn example: iqn.1992-04.com.emc:cx.apm00123907237.a8
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# or iqn.1992-04.com.emc:cx.apm00123907237.b8
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if not sp:
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break
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for endpoint in endpoints:
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if properties['target_iqn'] == endpoint:
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LOG.debug(_("Found iSCSI endpoint: %s") % endpoint)
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foundEndpoint = True
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break
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if foundEndpoint:
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break
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if sp and not foundEndpoint:
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LOG.warn(_("ISCSI endpoint not found for SP %(sp)s on "
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"storage system %(storage)s.")
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% {'sp': sp,
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'storage': storage_system})
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properties['target_lun'] = device_number
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properties['volume_id'] = volume['id']
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auth = volume['provider_auth']
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if auth:
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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.debug(_("ISCSI 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 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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backend_name = self.configuration.safe_get('volume_backend_name')
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data['volume_backend_name'] = backend_name or 'EMCSMISISCSIDriver'
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data['storage_protocol'] = 'iSCSI'
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self._stats = data
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