Unity Driver¶

Requirements¶

• Unity OE 4.0.1 or higher.
• StorOps 1.1.0 or higher is installed on Manila node.
• Following licenses are activated on Unity:
  • CIFS/SMB Support
  • Network File System (NFS)
  • Thin Provisioning
  • Fiber Channel (FC)
  • Internet Small Computer System Interface (iSCSI)

Supported Operations¶

In detail, users are allowed to do following operation with EMC Unity Storage Systems.

• Create/delete a NFS share.
• Create/delete a CIFS share.
• Extend the size of a share.
• Shrink the size of a share.
• Modify the host access privilege of a NFS share.
• Modify the user access privilege of a CIFS share.
• Take/Delete snapshot of a share.
• Create a new share from snapshot.

Supported Network Topologies¶

• flat
• VLAN

Pre-Configurations¶

pip install storops

Unisphere -> Settings -> Management -> System Time and NTP

Unisphere -> Settings -> Management -> DNS Server

Configurations¶

Following configurations need to be configured in /etc/manila/manila.conf for the Unity driver.

share_driver = manila.share.drivers.dell_emc.driver.EMCShareDriver
emc_share_backend = unity
emc_nas_server = <management IP address of the Unity system>
emc_nas_login = <user with administrator privilege>
emc_nas_password = <password>
emc_nas_server_container = [SPA|SPB]
emc_nas_pool_names = <Comma separated pool names>
emc_interface_ports = <Comma separated ports list>

• emc_share_backend is the plugin name. Set it to unity for the Unity driver.
• emc_nas_server is the management IP for Unity.
• emc_nas_server_container is the SP that will be used as share server.
• emc_nas_pool_names is the name of the pools to be used by this backend. If no name is specified, all storage pools on the system will be managed. Wild card character is supported. Examples: pool_1, pool_*, *
• emc_interface_ports is the white list of the ports to be used for connection. Wild card character is supported. Examples: spa_eth1, spa_*, *

Restart of manila-share service is needed for the configuration changes to take effect.

IPv6 support¶

IPv6 support for Unity driver is introduced in Queens release. The feature is divided into two parts:

1. The driver is able to manage share or snapshot in the Neutron IPv6 network.
2. The driver is able to connect Unity management interface using its IPv6 address.

Snapshot support¶

In the Mitaka and Newton release of OpenStack, Snapshot support is enabled by default for a newly created share type. Starting with the Ocata release, the snapshot_support extra spec must be set to True in order to allow snapshots for a share type. If the ‘snapshot_support’ extra_spec is omitted or if it is set to False, users would not be able to create snapshots on shares of this share type. The feature is divided into two parts:

1. The driver is able to create/delete snapshot of share.
2. The driver is able to create share from snapshot.

manila type-create --snapshot_support True --create_share_from_snapshot_support True ${share_type_name} True

manila type-key ${share_type_name} set snapshot_support=True
manila type-key ${share_type_name} set create_share_from_snapshot_support=True

manila snapshot-create ${source_share_name} --name ${target_snapshot_name} --description " "

manila create nfs 1 --name ${target_share_name} --metadata source=snapshot --description " " --snapshot-id ${source_snapshot_id}

Restrictions¶

The Unity driver has following restrictions.

• EMC Unity does not support the same IP in different VLANs.
• Only IP access type is supported for NFS.
• Only user access type is supported for CIFS.

API Implementations¶

Following driver features are implemented in the plugin.

• create_share: Create a share and export it based on the protocol used (NFS or CIFS).
• create_share_from_snapshot: Create a share from a snapshot - clone a snapshot.
• delete_share: Delete a share.
• extend_share: Extend the maximum size of a share.
• shrink_share: Shrink the minimum size of a share.
• create_snapshot: Create a snapshot for the specified share.
• delete_snapshot: Delete the snapshot of the share.
• update_access: recover, add or delete user/host access to a share.
• allow_access: Allow access (read write/read only) of a user to a CIFS share. Allow access (read write/read only) of a host to a NFS share.
• deny_access: Remove access (read write/read only) of a user from a CIFS share. Remove access (read write/read only) of a host from a NFS share.
• ensure_share: Check whether share exists or not.
• update_share_stats: Retrieve share related statistics from Unity.
• get_network_allocations_number: Returns number of network allocations for creating VIFs.
• setup_server: Set up and configures share server with given network parameters.
• teardown_server: Tear down the share server.

The manila.share.drivers.dell_emc.driver Module¶

EMC specific NAS storage driver. This driver is a pluggable driver that allows specific EMC NAS devices to be plugged-in as the underlying backend. Use the Manila configuration variable “share_backend_name” to specify, which backend plugins to use.

class EMCShareDriver(*args, **kwargs)

Bases: manila.share.driver.ShareDriver

EMC specific NAS driver. Allows for NFS and CIFS NAS storage usage.

allow_access(context, share, access, share_server=None)

Allow access to the share.

check_for_setup_error()

Check for setup error.

create_share(context, share, share_server=None)

Is called to create share.

create_share_from_snapshot(context, share, snapshot, share_server=None)

Is called to create share from snapshot.

create_snapshot(context, snapshot, share_server=None)

Is called to create snapshot.

delete_share(context, share, share_server=None)

Is called to remove share.

delete_snapshot(context, snapshot, share_server=None)

Is called to remove snapshot.

deny_access(context, share, access, share_server=None)

Deny access to the share.

do_setup(context)

Any initialization the share driver does while starting.

ensure_share(context, share, share_server=None)

Invoked to sure that share is exported.

extend_share(share, new_size, share_server=None)

Is called to extend share.

get_configured_ip_versions()

“Get allowed IP versions.

The supported versions are returned with list, possible values are: [4], [6], or [4, 6]

Drivers that assert ipv6_implemented = True must override this method. If the returned list includes 4, then shares created by this driver must have an IPv4 export location. If the list includes 6, then shares created by the driver must have an IPv6 export location.

Drivers should check that their storage controller actually has IPv4/IPv6 enabled and configured properly.

get_network_allocations_number()

Returns number of network allocations for creating VIFs.

revert_to_snapshot(context, snapshot, share_access_rules, snapshot_access_rules, share_server=None)

Reverts a share (in place) to the specified snapshot.

Does not delete the share snapshot. The share and snapshot must both be ‘available’ for the restore to be attempted. The snapshot must be the most recent one taken by Manila; the API layer performs this check so the driver doesn’t have to.

The share must be reverted in place to the contents of the snapshot. Application admins should quiesce or otherwise prepare the application for the shared file system contents to change suddenly.

Parameters:	context – Current context snapshot – The snapshot to be restored share_access_rules – List of all access rules for the affected share snapshot_access_rules – List of all access rules for the affected snapshot share_server – Optional – Share server model or None

shrink_share(share, new_size, share_server=None)

Is called to shrink share.

update_access(context, share, access_rules, add_rules, delete_rules, share_server=None)

Update access to the share.

The manila.share.drivers.dell_emc.plugins.unity.connection Module¶

Unity backend for the EMC Manila driver.

class UnityStorageConnection(*args, **kwargs)

Bases: manila.share.drivers.dell_emc.plugins.base.StorageConnection

Implements Unity specific functionality for EMC Manila driver.

IP_ALLOCATIONS = 1

allow_access(context, share, access, share_server=None)

Allow access to a share.

check_for_setup_error()

Check for setup error.

clear_access(share, white_list=None)

connect(emc_share_driver, context)

Connect to Unity storage.

create_share(context, share, share_server=None)

Create a share and export it based on protocol used.

create_share_from_snapshot(context, share, snapshot, share_server=None)

Create a share from a snapshot - clone a snapshot.

create_snapshot(context, snapshot, share_server=None)

Create snapshot from share.

delete_share(context, share, share_server=None)

Delete a share.

delete_snapshot(context, snapshot, share_server=None)

Delete a snapshot.

deny_access(context, share, access, share_server)

Deny access to a share.

ensure_share(context, share, share_server)

Ensure that the share is exported.

extend_share(share, new_size, share_server=None)

Invoked to extend share.

get_network_allocations_number()

Returns number of network allocations for creating VIFs.

get_pool(share)

Get the pool name of the share.

revert_to_snapshot(context, snapshot, share_access_rules, snapshot_access_rules, share_server=None)

Reverts a share (in place) to the specified snapshot.

setup_server(network_info, metadata=None)

Set up and configures share server with given network parameters.

shrink_share(share, new_size, share_server=None)

Shrinks a share to new size.

Parameters:	share – Share that will be shrunk. new_size – New size of share. share_server – Data structure with share server information. Not used by this driver.

teardown_server(server_details, security_services=None)

Teardown share server.

update_access(context, share, access_rules, add_rules, delete_rules, share_server=None)

Update access rules for given share.

update_share_stats(stats_dict)

Communicate with EMCNASClient to get the stats.

static validate_network(network_info)

validate_port_configuration(port_ids_conf)

Initializes the SP and ports based on the port option.