manila/doc/source/configuration/shared-file-systems/drivers/dell-emc-unity-driver.rst

EMC Unity driver

The EMC Shared File Systems service driver framework (EMCShareDriver) utilizes the EMC storage products to provide the shared file systems to OpenStack. The EMC driver is a plug-in based driver which is designed to use different plug-ins to manage different EMC storage products.

The Unity plug-in manages the Unity system to provide shared filesystems. The EMC driver framework with the Unity plug-in is referred to as the Unity driver in this document.

This driver performs the operations on Unity through RESTful APIs. Each back end manages one Storage Processor of Unity. Configure multiple Shared File Systems service back ends to manage multiple Unity systems.

Requirements

• Unity OE 4.1.x or higher.
• StorOps 0.4.3 or higher is installed on Manila node.
• Following licenses are activated on Unity:
  • CIFS/SMB Support
  • Network File System (NFS)
  • Thin Provisioning

Supported shared filesystems and operations

The driver supports CIFS and NFS shares.

The following operations are supported:

• Create a share.
• Delete a share.
• Allow share access.
• Deny share access.
• Create a snapshot.
• Delete a snapshot.
• Create a share from a snapshot.
• Extend a share.

Supported network types

• Flat

  This type is fully supported by Unity share driver, however flat networks are restricted due to the limited number of tenant networks that can be created from them.

• VLAN

  We recommend this type of network topology in Manila. In most use cases, VLAN is used to isolate the different tenants and provide an isolated network for each tenant. To support this function, an administrator needs to set a slot connected with Unity Ethernet port in Trunk mode or allow multiple VLANs from the slot.

• VXLAN

  Unity native VXLAN is still unavailable. However, with the HPB (Hierarchical Port Binding) in Networking and Shared file system services, it is possible that Unity co-exists with VXLAN enabled network environment.

Supported MTU size

Unity currently only supports 1500 and 9000 as the mtu size, the user can change the above mtu size from Unity Unisphere:

1. In the Unisphere, go to Settings, Access, and then Ethernet.
2. Double click the ethernet port.
3. Select the MTU size from the drop down list.

The Unity driver will select the port where mtu is equal to the mtu of share network during share server creation.

Supported security services

Unity share driver provides IP based authentication method support for NFS shares and user based authentication method for CIFS shares respectively. For CIFS share, Microsoft Active Directory is the only supported security services.

Pre-configurations

On manila node

Python library storops is required to run Unity driver. Install it with the pip command. You may need root privilege to install python libraries.

pip install storops

On Unity system

1. Configure system level NTP server.

   Open Unisphere of your Unity system and navigate to:

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

   Select Enable NTP synchronization and add your NTP server(s).

   The time on the Unity system and the Active Directory domains used in security services should be in sync. We recommend using the same NTP server on both the Unity system and Active Directory domains.

2. Configure system level DNS server.

   Open Unisphere of your Unity system and navigate to:

   Unisphere -> Settings -> Management -> DNS Server

   Select Configure DNS server address manually and add your DNS server(s).

Back end 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>
unity_server_meta_pool = <pool name>
unity_share_data_pools = <comma separated pool names>
unity_ethernet_ports = <comma separated ports list>
driver_handles_share_servers = True

• emc_share_backend

  The plugin name. Set it to unity for the Unity driver.

• emc_nas_server

  The management IP for Unity.

• emc_nas_login

  The user with administrator privilege.

• emc_nas_password

  Password for the user.

• unity_server_meta_pool

  The name of the pool to persist the meta-data of NAS server.

• unity_share_data_pools

  Comma separated list specifying the name of the pools to be used by this back end. Do not set this option if all storage pools on the system can be used. Wild card character is supported.

  Examples:

  # Only use pool_1
  unity_share_data_pools = pool_1
  # Only use pools whose name stars from pool_
  unity_share_data_pools = pool_*
  # Use all pools on Unity
  unity_share_data_pools = *

• unity_ethernet_ports

  Comma separated list specifying the ethernet ports of Unity system that can be used for share. Do not set this option if all ethernet ports can be used. Wild card character is supported. Both the normal ethernet port and link aggregation port can be used by Unity share driver.

  Examples:

  # Only use spa_eth1
  unity_ethernet_ports = spa_eth1
  # Use port whose name stars from spa_
  unity_ethernet_ports = spa_*
  # Use all Link Aggregation ports
  unity_ethernet_ports = sp*_la_*
  # Use all available ports
  unity_ethernet_ports = *

  Note

  Refer to unity_file_io_load_balance for performance impact.

• driver_handles_share_servers

  Unity driver requires this option to be as True.

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

IO Load balance

The Unity driver automatically distributes the file interfaces per storage processor based on the option unity_ethernet_ports. This balances IO traffic. The recommended configuration for unity_ethernet_ports specifies balanced ports per storage processor. For example:

# Use eth2 from both SPs
unity_ethernet_ports = spa_eth2, spb_eth2

Restrictions

The Unity driver has following restrictions.

• EMC Unity does not support the same IP in different VLANs.
• Only Active Directory security service is supported and it is required to create CIFS shares.

Driver options

Configuration options specific to this driver: