The `cinder.volume.drivers.dell_emc.vmax.iscsi` Module¶

ISCSI Drivers for Dell EMC VMAX arrays based on REST.

class VMAXISCSIDriver(*args, **kwargs)¶

Bases: cinder.volume.driver.ISCSIDriver

ISCSI Drivers for VMAX using Rest.

Version history:

1.0.0 - Initial driver
1.1.0 - Multiple pools and thick/thin provisioning,
        performance enhancement.
2.0.0 - Add driver requirement functions
2.1.0 - Add consistency group functions
2.1.1 - Fixed issue with mismatched config (bug #1442376)
2.1.2 - Clean up failed clones (bug #1440154)
2.1.3 - Fixed a problem with FAST support (bug #1435069)
2.2.0 - Add manage/unmanage
2.2.1 - Support for SE 8.0.3
2.2.2 - Update Consistency Group
2.2.3 - Pool aware scheduler(multi-pool) support
2.2.4 - Create CG from CG snapshot
2.3.0 - Name change for MV and SG for FAST (bug #1515181)
      - Fix for randomly choosing port group. (bug #1501919)
      - get_short_host_name needs to be called in find_device_number
        (bug #1520635)
      - Proper error handling for invalid SLOs (bug #1512795)
      - Extend Volume for VMAX3, SE8.1.0.3
      https://blueprints.launchpad.net/cinder/+spec/vmax3-extend-volume
      - Incorrect SG selected on an attach (#1515176)
      - Cleanup Zoning (bug #1501938)  NOTE: FC only
      - Last volume in SG fix
      - _remove_last_vol_and_delete_sg is not being called
        for VMAX3 (bug #1520549)
      - necessary updates for CG changes (#1534616)
      - Changing PercentSynced to CopyState (bug #1517103)
      - Getting iscsi ip from port in existing masking view
      - Replacement of EMCGetTargetEndpoints api (bug #1512791)
      - VMAX3 snapvx improvements (bug #1522821)
      - Operations and timeout issues (bug #1538214)
2.4.0 - EMC VMAX - locking SG for concurrent threads (bug #1554634)
      - SnapVX licensing checks for VMAX3 (bug #1587017)
      - VMAX oversubscription Support (blueprint vmax-oversubscription)
      - QoS support (blueprint vmax-qos)
      - VMAX2/VMAX3 iscsi multipath support (iscsi only)
      https://blueprints.launchpad.net/cinder/+spec/vmax-iscsi-multipath
2.5.0 - Attach and detach snapshot (blueprint vmax-attach-snapshot)
      - MVs and SGs not reflecting correct protocol (bug #1640222)
      - Storage assisted volume migration via retype
        (bp vmax-volume-migration)
      - Support for compression on All Flash
      - Volume replication 2.1 (bp add-vmax-replication)
      - rename and restructure driver (bp vmax-rename-dell-emc)
3.0.0 - REST based driver
      - Retype (storage-assisted migration)

CI_WIKI_NAME = ‘EMC_VMAX_CI’¶

VERSION = ‘3.0.0’¶

static check_for_export(context, volume_id)¶

Make sure volume is exported.

Parameters:	context – the context volume_id – the volume id

check_for_setup_error()¶

create_cloned_volume(volume, src_vref)¶

Creates a cloned volume.

Parameters:	volume – the cinder volume object src_vref – the source volume reference
Returns:	provider location dict

create_export(context, volume, connector)¶

Driver entry point to get the export info for a new volume.

Parameters:	context – the context volume – the cinder volume object connector – the connector object

create_snapshot(snapshot)¶

Creates a snapshot.

Parameters:	snapshot – the cinder snapshot object
Returns:	provider location dict

create_volume(volume)¶

Creates a VMAX volume.

Parameters:	volume – the cinder volume object
Returns:	provider location dict

create_volume_from_snapshot(volume, snapshot)¶

Creates a volume from a snapshot.

Parameters:	volume – the cinder volume object snapshot – the cinder snapshot object
Returns:	provider location dict

delete_snapshot(snapshot)¶

Deletes a snapshot.

Parameters:	snapshot – the cinder snapshot object

delete_volume(volume)¶

Deletes a VMAX volume.

Parameters:	volume – the cinder volume object

ensure_export(context, volume)¶

Driver entry point to get the export info for an existing volume.

Parameters:	context – the context volume – the cinder volume object

extend_volume(volume, new_size)¶

Extend an existing volume.

Parameters:	volume – the cinder volume object new_size – the required new size

get_iscsi_dict(device_info, volume)¶

Populate iscsi dict to pass to nova.

Parameters:	device_info – device info dict volume – volume object
Returns:	iscsi dict

get_volume_stats(refresh=False)¶

Get volume stats.

Parameters:	refresh – boolean – If True, run update the stats first.
Returns:	dict – the stats dict

initialize_connection(volume, connector)¶

Initializes the connection and returns connection info.

The iscsi driver returns a driver_volume_type of ‘iscsi’. the format of the driver data is defined in smis_get_iscsi_properties. Example return value:

{
    'driver_volume_type': 'iscsi'
    'data': {
        'target_discovered': True,
        'target_iqn': 'iqn.2010-10.org.openstack:volume-00000001',
        'target_portal': '127.0.0.0.1:3260',
        'volume_id': '12345678-1234-4321-1234-123456789012',
    }
}

Example return value (multipath is enabled)::

{

‘driver_volume_type’: ‘iscsi’ ‘data’: {

‘target_discovered’: True, ‘target_iqns’: [‘iqn.2010-10.org.openstack:volume-00001’,

‘iqn.2010-10.org.openstack:volume-00002’],

‘target_portals’: [‘127.0.0.1:3260’, ‘127.0.1.1:3260’], ‘target_luns’: [1, 1],

}

Parameters:	volume – the cinder volume object connector – the connector object
Returns:	dict – the iscsi dict

manage_existing(volume, external_ref)¶

Manages an existing VMAX Volume (import to Cinder).

Renames the Volume to match the expected name for the volume. Also need to consider things like QoS, Emulation, account/tenant.

manage_existing_get_size(volume, external_ref)¶

Return size of an existing VMAX volume to manage_existing.

Parameters:	self – reference to class volume – the volume object including the volume_type_id external_ref – reference to the existing volume
Returns:	size of the volume in GB

remove_export(context, volume)¶

Driver entry point to remove an export for a volume.

Parameters:	context – the context volume – the cinder volume object

retype(ctxt, volume, new_type, diff, host)¶

Migrate volume to another host using retype.

Parameters:	ctxt – context volume – the volume object including the volume_type_id new_type – the new volume type. diff – difference between old and new volume types. Unused in driver. host – the host dict holding the relevant target(destination) information
Returns:	boolean – True if retype succeeded, False if error

terminate_connection(volume, connector, **kwargs)¶

Disallow connection from connector.

Return empty data if other volumes are in the same zone. The FibreChannel ZoneManager doesn’t remove zones if there isn’t an initiator_target_map in the return of terminate_connection.

Parameters:	volume – the volume object connector – the connector object
Returns:	dict – the target_wwns and initiator_target_map if the zone is to be removed, otherwise empty

unmanage(volume)¶

Export VMAX volume from Cinder.

Leave the volume intact on the backend array.

update_volume_stats()¶: Retrieve stats info from volume group.

static vmax_get_iscsi_properties(volume, ip_and_iqn, is_multipath, host_lun_id)¶

Gets iscsi configuration.

We ideally get saved information in the volume entity, but fall back to discovery if need be. Discovery may be completely removed in future The properties are: :target_discovered: boolean indicating whether discovery was used :target_iqn: the IQN of the iSCSI target :target_portal: the portal of the iSCSI target :target_lun: the lun of the iSCSI target :volume_id: the UUID of the volume :auth_method:, :auth_username:, :auth_password:

the authentication details. Right now, either auth_method is not present meaning no authentication, or auth_method == CHAP meaning use CHAP with the specified credentials.

Parameters:	volume – the cinder volume object ip_and_iqn – list of ip and iqn dicts is_multipath – flag for multipath host_lun_id – the host lun id of the device
Returns:	properties

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The `cinder.volume.drivers.dell_emc.vmax.iscsi` Module¶