deb-cinder/cinder/volume/drivers/hpe/hpe_3par_iscsi.py
2016-08-12 21:47:06 +00:00

968 lines
37 KiB
Python

# (c) Copyright 2012-2015 Hewlett Packard Enterprise Development LP
# All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.
#
"""
Volume driver for HPE 3PAR Storage array.
This driver requires 3.1.3 firmware on the 3PAR array, using
the 4.x version of the hpe3parclient.
You will need to install the python hpe3parclient.
sudo pip install --upgrade "hpe3parclient>=4.0"
Set the following in the cinder.conf file to enable the
3PAR iSCSI Driver along with the required flags:
volume_driver=cinder.volume.drivers.hpe.hpe_3par_iscsi.HPE3PARISCSIDriver
"""
import re
import sys
try:
from hpe3parclient import exceptions as hpeexceptions
except ImportError:
hpeexceptions = None
from oslo_log import log as logging
from cinder import exception
from cinder.i18n import _, _LE, _LW
from cinder import interface
from cinder import utils
from cinder.volume import driver
from cinder.volume.drivers.hpe import hpe_3par_common as hpecommon
from cinder.volume.drivers.san import san
from cinder.volume import utils as volume_utils
LOG = logging.getLogger(__name__)
DEFAULT_ISCSI_PORT = 3260
CHAP_USER_KEY = "HPQ-cinder-CHAP-name"
CHAP_PASS_KEY = "HPQ-cinder-CHAP-secret"
@interface.volumedriver
class HPE3PARISCSIDriver(driver.TransferVD,
driver.ManageableVD,
driver.ExtendVD,
driver.SnapshotVD,
driver.ManageableSnapshotsVD,
driver.MigrateVD,
driver.ConsistencyGroupVD,
driver.BaseVD):
"""OpenStack iSCSI driver to enable 3PAR storage array.
Version history:
.. code-block:: none
1.0 - Initial driver
1.1 - QoS, extend volume, multiple iscsi ports, remove domain,
session changes, faster clone, requires 3.1.2 MU2 firmware.
1.2.0 - Updated the use of the hp3parclient to 2.0.0 and refactored
the drivers to use the new APIs.
1.2.1 - Synchronized extend_volume method.
1.2.2 - Added try/finally around client login/logout.
1.2.3 - log exceptions before raising
1.2.4 - Fixed iSCSI active path bug #1224594
1.2.5 - Added metadata during attach/detach bug #1258033
1.2.6 - Use least-used iscsi n:s:p for iscsi volume attach bug #1269515
This update now requires 3.1.2 MU3 firmware
1.3.0 - Removed all SSH code. We rely on the hp3parclient now.
2.0.0 - Update hp3parclient API uses 3.0.x
2.0.2 - Add back-end assisted volume migrate
2.0.3 - Added support for managing/unmanaging of volumes
2.0.4 - Added support for volume retype
2.0.5 - Added CHAP support, requires 3.1.3 MU1 firmware
and hp3parclient 3.1.0.
2.0.6 - Fixing missing login/logout around attach/detach bug #1367429
2.0.7 - Add support for pools with model update
2.0.8 - Migrate without losing type settings bug #1356608
2.0.9 - Removing locks bug #1381190
2.0.10 - Add call to queryHost instead SSH based findHost #1398206
2.0.11 - Added missing host name during attach fix #1398206
2.0.12 - Removed usage of host name cache #1398914
2.0.13 - Update LOG usage to fix translations. bug #1384312
2.0.14 - Do not allow a different iSCSI IP (hp3par_iscsi_ips) to be
used during live-migration. bug #1423958
2.0.15 - Added support for updated detach_volume attachment.
2.0.16 - Added encrypted property to initialize_connection #1439917
2.0.17 - Python 3 fixes
2.0.18 - Improved VLUN creation and deletion logic. #1469816
2.0.19 - Changed initialize_connection to use getHostVLUNs. #1475064
2.0.20 - Adding changes to support 3PAR iSCSI multipath.
2.0.21 - Adds consistency group support
2.0.22 - Update driver to use ABC metaclasses
2.0.23 - Added update_migrated_volume. bug # 1492023
3.0.0 - Rebranded HP to HPE.
3.0.1 - Python 3 support
3.0.2 - Remove db access for consistency groups
3.0.3 - Fix multipath dictionary key error. bug #1522062
3.0.4 - Adds v2 managed replication support
3.0.5 - Adds v2 unmanaged replication support
3.0.6 - Adding manage/unmanage snapshot support
3.0.7 - Optimize array ID retrieval
3.0.8 - Update replication to version 2.1
3.0.9 - Use same LUN ID for each VLUN path #1551994
3.0.10 - Remove metadata that tracks the instance ID. bug #1572665
3.0.11 - _create_3par_iscsi_host() now accepts iscsi_iqn as list only.
Bug #1590180
3.0.12 - Added entry point tracing
"""
VERSION = "3.0.12"
# The name of the CI wiki page.
CI_WIKI_NAME = "HPE_Storage_CI"
def __init__(self, *args, **kwargs):
super(HPE3PARISCSIDriver, self).__init__(*args, **kwargs)
self._active_backend_id = kwargs.get('active_backend_id', None)
self.configuration.append_config_values(hpecommon.hpe3par_opts)
self.configuration.append_config_values(san.san_opts)
def _init_common(self):
return hpecommon.HPE3PARCommon(self.configuration,
self._active_backend_id)
def _login(self, timeout=None):
common = self._init_common()
# If replication is enabled and we cannot login, we do not want to
# raise an exception so a failover can still be executed.
try:
common.do_setup(None, timeout=timeout, stats=self._stats)
common.client_login()
except Exception:
if common._replication_enabled:
LOG.warning(_LW("The primary array is not reachable at this "
"time. Since replication is enabled, "
"listing replication targets and failing over "
"a volume can still be performed."))
pass
else:
raise
return common
def _logout(self, common):
# If replication is enabled and we do not have a client ID, we did not
# login, but can still failover. There is no need to logout.
if common.client is None and common._replication_enabled:
return
common.client_logout()
def _check_flags(self, common):
"""Sanity check to ensure we have required options set."""
required_flags = ['hpe3par_api_url', 'hpe3par_username',
'hpe3par_password', 'san_ip', 'san_login',
'san_password']
common.check_flags(self.configuration, required_flags)
@utils.trace
def get_volume_stats(self, refresh=False):
common = self._login()
try:
self._stats = common.get_volume_stats(
refresh,
self.get_filter_function(),
self.get_goodness_function())
self._stats['storage_protocol'] = 'iSCSI'
self._stats['driver_version'] = self.VERSION
backend_name = self.configuration.safe_get('volume_backend_name')
self._stats['volume_backend_name'] = (backend_name or
self.__class__.__name__)
return self._stats
finally:
self._logout(common)
def do_setup(self, context):
common = self._init_common()
common.do_setup(context)
self._check_flags(common)
common.check_for_setup_error()
self.iscsi_ips = {}
common.client_login()
try:
self.initialize_iscsi_ports(common)
finally:
self._logout(common)
def initialize_iscsi_ports(self, common):
# map iscsi_ip-> ip_port
# -> iqn
# -> nsp
iscsi_ip_list = {}
temp_iscsi_ip = {}
# use the 3PAR ip_addr list for iSCSI configuration
if len(common._client_conf['hpe3par_iscsi_ips']) > 0:
# add port values to ip_addr, if necessary
for ip_addr in common._client_conf['hpe3par_iscsi_ips']:
ip = ip_addr.split(':')
if len(ip) == 1:
temp_iscsi_ip[ip_addr] = {'ip_port': DEFAULT_ISCSI_PORT}
elif len(ip) == 2:
temp_iscsi_ip[ip[0]] = {'ip_port': ip[1]}
else:
LOG.warning(_LW("Invalid IP address format '%s'"), ip_addr)
# add the single value iscsi_ip_address option to the IP dictionary.
# This way we can see if it's a valid iSCSI IP. If it's not valid,
# we won't use it and won't bother to report it, see below
if (common._client_conf['iscsi_ip_address'] not in temp_iscsi_ip):
ip = common._client_conf['iscsi_ip_address']
ip_port = common._client_conf['iscsi_port']
temp_iscsi_ip[ip] = {'ip_port': ip_port}
# get all the valid iSCSI ports from 3PAR
# when found, add the valid iSCSI ip, ip port, iqn and nsp
# to the iSCSI IP dictionary
iscsi_ports = common.get_active_iscsi_target_ports()
for port in iscsi_ports:
ip = port['IPAddr']
if ip in temp_iscsi_ip:
ip_port = temp_iscsi_ip[ip]['ip_port']
iscsi_ip_list[ip] = {'ip_port': ip_port,
'nsp': port['nsp'],
'iqn': port['iSCSIName']}
del temp_iscsi_ip[ip]
# if the single value iscsi_ip_address option is still in the
# temp dictionary it's because it defaults to $my_ip which doesn't
# make sense in this context. So, if present, remove it and move on.
if common._client_conf['iscsi_ip_address'] in temp_iscsi_ip:
del temp_iscsi_ip[common._client_conf['iscsi_ip_address']]
# lets see if there are invalid iSCSI IPs left in the temp dict
if len(temp_iscsi_ip) > 0:
LOG.warning(_LW("Found invalid iSCSI IP address(s) in "
"configuration option(s) hpe3par_iscsi_ips or "
"iscsi_ip_address '%s.'"),
(", ".join(temp_iscsi_ip)))
if not len(iscsi_ip_list) > 0:
msg = _('At least one valid iSCSI IP address must be set.')
LOG.error(msg)
raise exception.InvalidInput(reason=msg)
self.iscsi_ips[common._client_conf['hpe3par_api_url']] = iscsi_ip_list
def check_for_setup_error(self):
"""Setup errors are already checked for in do_setup so return pass."""
pass
@utils.trace
def create_volume(self, volume):
common = self._login()
try:
return common.create_volume(volume)
finally:
self._logout(common)
@utils.trace
def create_cloned_volume(self, volume, src_vref):
"""Clone an existing volume."""
common = self._login()
try:
return common.create_cloned_volume(volume, src_vref)
finally:
self._logout(common)
@utils.trace
def delete_volume(self, volume):
common = self._login()
try:
common.delete_volume(volume)
finally:
self._logout(common)
@utils.trace
def create_volume_from_snapshot(self, volume, snapshot):
"""Creates a volume from a snapshot.
TODO: support using the size from the user.
"""
common = self._login()
try:
return common.create_volume_from_snapshot(volume, snapshot)
finally:
self._logout(common)
@utils.trace
def create_snapshot(self, snapshot):
common = self._login()
try:
common.create_snapshot(snapshot)
finally:
self._logout(common)
@utils.trace
def delete_snapshot(self, snapshot):
common = self._login()
try:
common.delete_snapshot(snapshot)
finally:
self._logout(common)
@utils.trace
def initialize_connection(self, volume, connector):
"""Assigns the volume to a server.
Assign any created volume to a compute node/host so that it can be
used from that host.
This driver returns a driver_volume_type of 'iscsi'.
The format of the driver data is defined in _get_iscsi_properties.
Example return value:
.. code-block:: json
{
'driver_volume_type': 'iscsi'
'data': {
'encrypted': False,
'target_discovered': True,
'target_iqn': 'iqn.2010-10.org.openstack:volume-00000001',
'target_protal': '127.0.0.1:3260',
'volume_id': 1,
}
}
Steps to export a volume on 3PAR
* Get the 3PAR iSCSI iqn
* Create a host on the 3par
* create vlun on the 3par
"""
common = self._login()
try:
# If the volume has been failed over, we need to reinitialize
# iSCSI ports so they represent the new array.
if volume.get('replication_status') == 'failed-over' and (
common._client_conf['hpe3par_api_url'] not in self.iscsi_ips):
self.initialize_iscsi_ports(common)
# Grab the correct iSCSI ports
iscsi_ips = self.iscsi_ips[common._client_conf['hpe3par_api_url']]
# we have to make sure we have a host
host, username, password = self._create_host(
common,
volume,
connector)
if connector.get('multipath'):
ready_ports = common.client.getiSCSIPorts(
state=common.client.PORT_STATE_READY)
target_portals = []
target_iqns = []
target_luns = []
# Target portal ips are defined in cinder.conf.
target_portal_ips = iscsi_ips.keys()
# Collect all existing VLUNs for this volume/host combination.
existing_vluns = common.find_existing_vluns(volume, host)
# Cycle through each ready iSCSI port and determine if a new
# VLUN should be created or an existing one used.
lun_id = None
for port in ready_ports:
iscsi_ip = port['IPAddr']
if iscsi_ip in target_portal_ips:
vlun = None
# check for an already existing VLUN matching the
# nsp for this iSCSI IP. If one is found, use it
# instead of creating a new VLUN.
for v in existing_vluns:
portPos = common.build_portPos(
iscsi_ips[iscsi_ip]['nsp'])
if v['portPos'] == portPos:
vlun = v
break
else:
vlun = common.create_vlun(
volume, host, iscsi_ips[iscsi_ip]['nsp'],
lun_id=lun_id)
# We want to use the same LUN ID for every port
if lun_id is None:
lun_id = vlun['lun']
iscsi_ip_port = "%s:%s" % (
iscsi_ip, iscsi_ips[iscsi_ip]['ip_port'])
target_portals.append(iscsi_ip_port)
target_iqns.append(port['iSCSIName'])
target_luns.append(vlun['lun'])
else:
LOG.warning(_LW("iSCSI IP: '%s' was not found in "
"hpe3par_iscsi_ips list defined in "
"cinder.conf."), iscsi_ip)
info = {'driver_volume_type': 'iscsi',
'data': {'target_portals': target_portals,
'target_iqns': target_iqns,
'target_luns': target_luns,
'target_discovered': True
}
}
else:
least_used_nsp = None
# check if a VLUN already exists for this host
existing_vlun = common.find_existing_vlun(volume, host)
if existing_vlun:
# We override the nsp here on purpose to force the
# volume to be exported out the same IP as it already is.
# This happens during nova live-migration, we want to
# disable the picking of a different IP that we export
# the volume to, or nova complains.
least_used_nsp = common.build_nsp(existing_vlun['portPos'])
if not least_used_nsp:
least_used_nsp = self._get_least_used_nsp_for_host(
common,
host['name'])
vlun = None
if existing_vlun is None:
# now that we have a host, create the VLUN
vlun = common.create_vlun(volume, host, least_used_nsp)
else:
vlun = existing_vlun
if least_used_nsp is None:
LOG.warning(_LW("Least busy iSCSI port not found, "
"using first iSCSI port in list."))
iscsi_ip = list(iscsi_ips)[0]
else:
iscsi_ip = self._get_ip_using_nsp(least_used_nsp, common)
iscsi_ip_port = iscsi_ips[iscsi_ip]['ip_port']
iscsi_target_iqn = iscsi_ips[iscsi_ip]['iqn']
info = {'driver_volume_type': 'iscsi',
'data': {'target_portal': "%s:%s" %
(iscsi_ip, iscsi_ip_port),
'target_iqn': iscsi_target_iqn,
'target_lun': vlun['lun'],
'target_discovered': True
}
}
if common._client_conf['hpe3par_iscsi_chap_enabled']:
info['data']['auth_method'] = 'CHAP'
info['data']['auth_username'] = username
info['data']['auth_password'] = password
encryption_key_id = volume.get('encryption_key_id', None)
info['data']['encrypted'] = encryption_key_id is not None
return info
finally:
self._logout(common)
@utils.trace
def terminate_connection(self, volume, connector, **kwargs):
"""Driver entry point to unattach a volume from an instance."""
common = self._login()
try:
hostname = common._safe_hostname(connector['host'])
common.terminate_connection(
volume,
hostname,
iqn=connector['initiator'])
self._clear_chap_3par(common, volume)
finally:
self._logout(common)
def _clear_chap_3par(self, common, volume):
"""Clears CHAP credentials on a 3par volume.
Ignore exceptions caused by the keys not being present on a volume.
"""
vol_name = common._get_3par_vol_name(volume['id'])
try:
common.client.removeVolumeMetaData(vol_name, CHAP_USER_KEY)
except hpeexceptions.HTTPNotFound:
pass
except Exception:
raise
try:
common.client.removeVolumeMetaData(vol_name, CHAP_PASS_KEY)
except hpeexceptions.HTTPNotFound:
pass
except Exception:
raise
def _create_3par_iscsi_host(self, common, hostname, iscsi_iqn, domain,
persona_id):
"""Create a 3PAR host.
Create a 3PAR host, if there is already a host on the 3par using
the same iqn but with a different hostname, return the hostname
used by 3PAR.
"""
# first search for an existing host
host_found = None
hosts = common.client.queryHost(iqns=iscsi_iqn)
if hosts and hosts['members'] and 'name' in hosts['members'][0]:
host_found = hosts['members'][0]['name']
if host_found is not None:
return host_found
else:
persona_id = int(persona_id)
common.client.createHost(hostname, iscsiNames=iscsi_iqn,
optional={'domain': domain,
'persona': persona_id})
return hostname
def _modify_3par_iscsi_host(self, common, hostname, iscsi_iqn):
mod_request = {'pathOperation': common.client.HOST_EDIT_ADD,
'iSCSINames': [iscsi_iqn]}
common.client.modifyHost(hostname, mod_request)
def _set_3par_chaps(self, common, hostname, volume, username, password):
"""Sets a 3PAR host's CHAP credentials."""
if not common._client_conf['hpe3par_iscsi_chap_enabled']:
return
mod_request = {'chapOperation': common.client.HOST_EDIT_ADD,
'chapOperationMode': common.client.CHAP_INITIATOR,
'chapName': username,
'chapSecret': password}
common.client.modifyHost(hostname, mod_request)
def _create_host(self, common, volume, connector):
"""Creates or modifies existing 3PAR host."""
# make sure we don't have the host already
host = None
username = None
password = None
hostname = common._safe_hostname(connector['host'])
cpg = common.get_cpg(volume, allowSnap=True)
domain = common.get_domain(cpg)
# Get the CHAP secret if CHAP is enabled
if common._client_conf['hpe3par_iscsi_chap_enabled']:
vol_name = common._get_3par_vol_name(volume['id'])
username = common.client.getVolumeMetaData(
vol_name, CHAP_USER_KEY)['value']
password = common.client.getVolumeMetaData(
vol_name, CHAP_PASS_KEY)['value']
try:
host = common._get_3par_host(hostname)
except hpeexceptions.HTTPNotFound:
# get persona from the volume type extra specs
persona_id = common.get_persona_type(volume)
# host doesn't exist, we have to create it
hostname = self._create_3par_iscsi_host(common,
hostname,
[connector['initiator']],
domain,
persona_id)
self._set_3par_chaps(common, hostname, volume, username, password)
host = common._get_3par_host(hostname)
else:
if 'iSCSIPaths' not in host or len(host['iSCSIPaths']) < 1:
self._modify_3par_iscsi_host(
common, hostname,
connector['initiator'])
self._set_3par_chaps(
common,
hostname,
volume,
username,
password)
host = common._get_3par_host(hostname)
elif (not host['initiatorChapEnabled'] and
common._client_conf['hpe3par_iscsi_chap_enabled']):
LOG.warning(_LW("Host exists without CHAP credentials set and "
"has iSCSI attachments but CHAP is enabled. "
"Updating host with new CHAP credentials."))
self._set_3par_chaps(
common,
hostname,
volume,
username,
password)
return host, username, password
def _do_export(self, common, volume):
"""Gets the associated account, generates CHAP info and updates."""
model_update = {}
if not common._client_conf['hpe3par_iscsi_chap_enabled']:
model_update['provider_auth'] = None
return model_update
# CHAP username will be the hostname
chap_username = volume['host'].split('@')[0]
chap_password = None
try:
# Get all active VLUNs for the host
vluns = common.client.getHostVLUNs(chap_username)
# Host has active VLUNs... is CHAP enabled on host?
host_info = common.client.getHost(chap_username)
if not host_info['initiatorChapEnabled']:
LOG.warning(_LW("Host has no CHAP key, but CHAP is enabled."))
except hpeexceptions.HTTPNotFound:
chap_password = volume_utils.generate_password(16)
LOG.warning(_LW("No host or VLUNs exist. Generating new "
"CHAP key."))
else:
# Get a list of all iSCSI VLUNs and see if there is already a CHAP
# key assigned to one of them. Use that CHAP key if present,
# otherwise create a new one. Skip any VLUNs that are missing
# CHAP credentials in metadata.
chap_exists = False
active_vluns = 0
for vlun in vluns:
if not vlun['active']:
continue
active_vluns += 1
# iSCSI connections start with 'iqn'.
if ('remoteName' in vlun and
re.match('iqn.*', vlun['remoteName'])):
try:
chap_password = common.client.getVolumeMetaData(
vlun['volumeName'], CHAP_PASS_KEY)['value']
chap_exists = True
break
except hpeexceptions.HTTPNotFound:
LOG.debug("The VLUN %s is missing CHAP credentials "
"but CHAP is enabled. Skipping.",
vlun['remoteName'])
else:
LOG.warning(_LW("Non-iSCSI VLUN detected."))
if not chap_exists:
chap_password = volume_utils.generate_password(16)
LOG.warning(_LW("No VLUN contained CHAP credentials. "
"Generating new CHAP key."))
# Add CHAP credentials to the volume metadata
vol_name = common._get_3par_vol_name(volume['id'])
common.client.setVolumeMetaData(
vol_name, CHAP_USER_KEY, chap_username)
common.client.setVolumeMetaData(
vol_name, CHAP_PASS_KEY, chap_password)
model_update['provider_auth'] = ('CHAP %s %s' %
(chap_username, chap_password))
return model_update
@utils.trace
def create_export(self, context, volume, connector):
common = self._login()
try:
return self._do_export(common, volume)
finally:
self._logout(common)
@utils.trace
def ensure_export(self, context, volume):
"""Ensure the volume still exists on the 3PAR.
Also retrieves CHAP credentials, if present on the volume
"""
common = self._login()
try:
vol_name = common._get_3par_vol_name(volume['id'])
common.client.getVolume(vol_name)
except hpeexceptions.HTTPNotFound:
LOG.error(_LE("Volume %s doesn't exist on array."), vol_name)
else:
metadata = common.client.getAllVolumeMetaData(vol_name)
username = None
password = None
model_update = {}
model_update['provider_auth'] = None
for member in metadata['members']:
if member['key'] == CHAP_USER_KEY:
username = member['value']
elif member['key'] == CHAP_PASS_KEY:
password = member['value']
if username and password:
model_update['provider_auth'] = ('CHAP %s %s' %
(username, password))
return model_update
finally:
self._logout(common)
def remove_export(self, context, volume):
pass
def _get_least_used_nsp_for_host(self, common, hostname):
"""Get the least used NSP for the current host.
Steps to determine which NSP to use.
* If only one iSCSI NSP, return it
* If there is already an active vlun to this host, return its NSP
* Return NSP with fewest active vluns
"""
iscsi_nsps = self._get_iscsi_nsps(common)
# If there's only one path, use it
if len(iscsi_nsps) == 1:
return iscsi_nsps[0]
# Try to reuse an existing iscsi path to the host
vluns = common.client.getVLUNs()
for vlun in vluns['members']:
if vlun['active']:
if vlun['hostname'] == hostname:
temp_nsp = common.build_nsp(vlun['portPos'])
if temp_nsp in iscsi_nsps:
# this host already has an iscsi path, so use it
return temp_nsp
# Calculate the least used iscsi nsp
least_used_nsp = self._get_least_used_nsp(common,
vluns['members'],
self._get_iscsi_nsps(common))
return least_used_nsp
def _get_iscsi_nsps(self, common):
"""Return the list of candidate nsps."""
nsps = []
iscsi_ips = self.iscsi_ips[common._client_conf['hpe3par_api_url']]
for value in iscsi_ips.values():
nsps.append(value['nsp'])
return nsps
def _get_ip_using_nsp(self, nsp, common):
"""Return IP associated with given nsp."""
iscsi_ips = self.iscsi_ips[common._client_conf['hpe3par_api_url']]
for (key, value) in iscsi_ips.items():
if value['nsp'] == nsp:
return key
def _get_least_used_nsp(self, common, vluns, nspss):
"""Return the nsp that has the fewest active vluns."""
# return only the nsp (node:server:port)
# count the number of nsps
nsp_counts = {}
for nsp in nspss:
# initialize counts to zero
nsp_counts[nsp] = 0
current_least_used_nsp = None
for vlun in vluns:
if vlun['active']:
nsp = common.build_nsp(vlun['portPos'])
if nsp in nsp_counts:
nsp_counts[nsp] = nsp_counts[nsp] + 1
# identify key (nsp) of least used nsp
current_smallest_count = sys.maxsize
for (nsp, count) in nsp_counts.items():
if count < current_smallest_count:
current_least_used_nsp = nsp
current_smallest_count = count
return current_least_used_nsp
@utils.trace
def extend_volume(self, volume, new_size):
common = self._login()
try:
common.extend_volume(volume, new_size)
finally:
self._logout(common)
@utils.trace
def create_consistencygroup(self, context, group):
common = self._login()
try:
common.create_consistencygroup(context, group)
finally:
self._logout(common)
@utils.trace
def create_consistencygroup_from_src(self, context, group, volumes,
cgsnapshot=None, snapshots=None,
source_cg=None, source_vols=None):
common = self._login()
try:
return common.create_consistencygroup_from_src(
context, group, volumes, cgsnapshot, snapshots, source_cg,
source_vols)
finally:
self._logout(common)
@utils.trace
def delete_consistencygroup(self, context, group, volumes):
common = self._login()
try:
return common.delete_consistencygroup(context, group, volumes)
finally:
self._logout(common)
@utils.trace
def update_consistencygroup(self, context, group,
add_volumes=None, remove_volumes=None):
common = self._login()
try:
return common.update_consistencygroup(context, group, add_volumes,
remove_volumes)
finally:
self._logout(common)
@utils.trace
def create_cgsnapshot(self, context, cgsnapshot, snapshots):
common = self._login()
try:
return common.create_cgsnapshot(context, cgsnapshot, snapshots)
finally:
self._logout(common)
@utils.trace
def delete_cgsnapshot(self, context, cgsnapshot, snapshots):
common = self._login()
try:
return common.delete_cgsnapshot(context, cgsnapshot, snapshots)
finally:
self._logout(common)
@utils.trace
def manage_existing(self, volume, existing_ref):
common = self._login()
try:
return common.manage_existing(volume, existing_ref)
finally:
self._logout(common)
@utils.trace
def manage_existing_snapshot(self, snapshot, existing_ref):
common = self._login()
try:
return common.manage_existing_snapshot(snapshot, existing_ref)
finally:
self._logout(common)
@utils.trace
def manage_existing_get_size(self, volume, existing_ref):
common = self._login()
try:
return common.manage_existing_get_size(volume, existing_ref)
finally:
self._logout(common)
@utils.trace
def manage_existing_snapshot_get_size(self, snapshot, existing_ref):
common = self._login()
try:
return common.manage_existing_snapshot_get_size(snapshot,
existing_ref)
finally:
self._logout(common)
@utils.trace
def unmanage(self, volume):
common = self._login()
try:
common.unmanage(volume)
finally:
self._logout(common)
@utils.trace
def unmanage_snapshot(self, snapshot):
common = self._login()
try:
common.unmanage_snapshot(snapshot)
finally:
self._logout(common)
@utils.trace
def retype(self, context, volume, new_type, diff, host):
"""Convert the volume to be of the new type."""
common = self._login()
try:
return common.retype(volume, new_type, diff, host)
finally:
self._logout(common)
@utils.trace
def migrate_volume(self, context, volume, host):
if volume['status'] == 'in-use':
protocol = host['capabilities']['storage_protocol']
if protocol != 'iSCSI':
LOG.debug("3PAR ISCSI driver cannot migrate in-use volume "
"to a host with storage_protocol=%s.", protocol)
return False, None
common = self._login()
try:
return common.migrate_volume(volume, host)
finally:
self._logout(common)
@utils.trace
def update_migrated_volume(self, context, volume, new_volume,
original_volume_status):
"""Update the name of the migrated volume to it's new ID."""
common = self._login()
try:
return common.update_migrated_volume(context, volume, new_volume,
original_volume_status)
finally:
self._logout(common)
@utils.trace
def get_pool(self, volume):
common = self._login()
try:
return common.get_cpg(volume)
except hpeexceptions.HTTPNotFound:
reason = (_("Volume %s doesn't exist on array.") % volume)
LOG.error(reason)
raise exception.InvalidVolume(reason)
finally:
self._logout(common)
@utils.trace
def failover_host(self, context, volumes, secondary_id=None):
"""Force failover to a secondary replication target."""
common = self._login(timeout=30)
try:
# Update the active_backend_id in the driver and return it.
active_backend_id, volume_updates = common.failover_host(
context, volumes, secondary_id)
self._active_backend_id = active_backend_id
return active_backend_id, volume_updates
finally:
self._logout(common)