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.
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.
Unity currently only supports 1500 and 9000 as the mtu size, the user can change the above mtu size from Unity Unisphere:
The Unity driver will select the port where mtu is equal to the mtu of share network during share server creation.
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.
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
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).
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_passowrd
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 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.
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
The Unity driver has following restrictions.
Configuration options specific to this driver:
Configuration option = Default value | Description |
---|---|
[DEFAULT] | |
unity_ethernet_ports = None |
(List) Comma separated list of ports that can be used for share server interfaces. Members of the list can be Unix-style glob expressions. |
unity_server_meta_pool = None |
(String) Pool to persist the meta-data of NAS server. |
unity_share_data_pools = None |
(List) Comma separated list of pools that can be used to persist share data. |
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