Dell 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 backend manages one Storage Processor of Unity. Configure multiple Shared File Systems service backends to manage multiple Unity systems.
Requirements¶
Unity OE 4.1.x 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 Network Topologies¶
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.
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¶
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.
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).
Backend 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/False
unity_share_server = <name of NAS server in Unity system>
report_default_filter_function = True/False
- emc_share_backend
The plugin name. Set it to unity for the Unity driver.
- emc_nas_server
The management IP for Unity.
- unity_server_meta_pool
The name of the pool to persist the meta-data of NAS server. This option is required.
- unity_share_data_pools
Comma separated list specifying the name of the pools to be used by this backend. 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 = *
- driver_handles_share_servers
Unity driver requires this option to be as True or False. Need to set unity_share_server when the value is False.
- unity_share_server
One of NAS server names in Unity, it is used for share creation when the driver is in DHSS=False mode.
- report_default_filter_function
Whether or not report default filter function. Default value is False. However, this value will be changed to True in a future release to ensure compliance with design expectations in Manila. So we recommend always setting this option in your deployment to True or False per your desired behavior.
Restart of manila-share service is needed for the configuration changes to take effect.
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:
In the Unisphere, go to Settings, Access, and then Ethernet.
Double click the ethernet port.
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.
IPv6 support¶
IPv6 support for Unity driver is introduced in Queens release. The feature is divided into two parts:
The driver is able to manage share or snapshot in the Neutron IPv6 network.
The driver is able to connect Unity management interface using its IPv6 address.
Pre-Configurations for IPv6 support¶
The following parameters need to be configured in /etc/manila/manila.conf for the Unity driver:
network_plugin_ipv6_enabled = True
network_plugin_ipv6_enabled indicates IPv6 is enabled.
If you want to connect Unity using IPv6 address, you should configure IPv6 address by /net/if/mgmt uemcli command, mgmtInterfaceSettings RESTful api or the system settings of Unity GUI for Unity and specify the address in /etc/manila/manila.conf:
emc_nas_server = <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:
The driver is able to create/delete snapshot of share.
The driver is able to create share from snapshot.
Pre-Configurations for Snapshot support¶
The following extra specifications need to be configured with share type.
snapshot_support = True
create_share_from_snapshot_support = True
For new share type, these extra specifications can be set directly when creating share type:
$ manila type-create --snapshot_support True --create_share_from_snapshot_support True ${share_type_name} True
Or you can update already existing share type with command:
$ manila type-key ${share_type_name} set snapshot_support=True
$ manila type-key ${share_type_name} set create_share_from_snapshot_support=True
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 service.
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
Default filter function¶
Unity does not support the file system creation with size smaller than 3GB, if the size of share user create is smaller than 3GB, Unity driver will supplement the size to 3GB in Unity.
Unity driver implemented the get_default_filter_function API to report the default filter function, if the share size is smaller than 3GB, Manila will not schedule the share creation to Unity backend.
Unity driver provides an option report_default_filter_function
to disable
or enable the filter function reporting, the default value is disabled.
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.
revert_to_snapshot: Revert a share to a snapshot.
get_default_filter_function: Report a default filter function.
Driver options¶
Configuration options specific to this driver:
Configuration option = Default value |
Description |
---|---|
[DEFAULT] |
|
|
(List) Comma separated list of ports that can be used for share server interfaces. Members of the list can be Unix-style glob expressions. |
|
(String) Pool to persist the meta-data of NAS server. |
|
(List) Comma separated list of pools that can be used to persist share data. |
|
One of NAS server names in Unity, it is used for share creation when the driver is in |