.. Copyright (c) 2014 EMC Corporation All Rights Reserved. Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0 Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License. VNX Driver ========== EMC manila driver framework (EMCShareDriver) utilizes the EMC storage products to provide the shared filesystems to OpenStack. The EMC manila driver is a plugin based driver which is designed to use different plugins to manage different EMC storage products. VNX plugin is the plugin which manages the VNX to provide shared filesystems. EMC driver framework with VNX plugin is referred to as VNX driver in this document. This driver performs the operations on VNX by XMLAPI and the File command line. Each backend manages one Data Mover of VNX. Multiple manila backends need to be configured to manage multiple Data Movers. Requirements ------------ - VNX OE for File version 7.1 or higher. - VNX Unified, File only, or Gateway system with single storage backend. - The following licenses should be activated on VNX for File: * CIFS * NFS * SnapSure (for snapshot) * ReplicationV2 (for create share from snapshot) Supported Operations -------------------- The following operations will be supported on VNX array: - Create CIFS/NFS Share - Delete CIFS/NFS Share - Allow CIFS/NFS Share access * Only IP access type is supported for NFS. * Only user access type is supported for CIFS. - Deny CIFS/NFS Share access - Create snapshot - Delete snapshot - Create share from snapshot While the generic driver creates shared filesystems based on Cinder volumes attached to Nova VMs, the VNX driver performs similar operations using the Data Movers on the array. Pre-Configurations on VNX ------------------------- 1. Enable Unicode on Data mover VNX driver requires that the Unicode is enabled on Data Mover. CAUTION: After enabling Unicode, you cannot disable it. If there are some filesystems created before Unicode is enabled on the VNX, consult the storage administrator before enabling Unicode. To check the Unicode status on Data Mover, use the following VNX File command on VNX control station: server_cifs | head where: mover_name = Check the value of `I18N mode` field. UNICODE mode is shown as `I18N mode = UNICODE` To enable the Unicode for Data Mover: uc_config -on -mover where: mover_name = Refer to the document `Using International Character Sets on VNX for File` on [EMC support site](http://support.emc.com) for more information. 2. Enable CIFS service on Data Mover Ensure the CIFS service is enabled on the Data Mover which is going to be managed by VNX driver. To start the CIFS service, use the following command: server_setup -Protocol cifs -option start [=] where: = [=] = Note: If there is 1 GB of memory on the Data Mover, the default is 96 threads; however, if there is over 1 GB of memory, the default number of threads is 256. To check the CIFS service status, use this command: server_cifs | head where: = The command output will show the number of CIFS threads started. 3. NTP settings on Data Mover VNX driver only supports CIFS share creation with share network which has an Active Directory security-service associated. Creating CIFS share requires that the time on the Data Mover is in sync with the Active Directory domain so that the CIFS server can join the domain. Otherwise, the domain join will fail when creating share with this security service. There is a limitation that the time of the domains used by security-services even for different tenants and different share networks should be in sync. Time difference should be less than 10 minutes. It is recommended to set the NTP server to the same public NTP server on both the Data Mover and domains used in security services to ensure the time is in sync everywhere. Check the date and time on Data Mover: server_date where: mover_name = Set the NTP server for Data Mover: server_date timesvc start ntp [ ...] where: mover_name = host = Note: The host must be running the NTP protocol. Only 4 host entries are allowed. 4. Configure User Mapping on the Data Mover Before creating CIFS share using VNX driver, you must select a method of mapping Windows SIDs to UIDs and GIDs. EMC recommends using usermapper in single protocol (CIFS) environment which is enabled on VNX by default. To check usermapper status, use this command syntax: server_usermapper where: = If usermapper is not started, the following command can be used to start the usermapper: server_usermapper -enable where: = For multiple protocol environment, refer to `Configuring VNX User Mapping` on [EMC support site](http://support.emc.com) for additional information. 5. Network Connection In the current release, the share created by VNX driver uses the first network device (physical port on NIC) of Data Mover to access the network. Go to Unisphere to check the device list: Settings -> Network -> Settings for File (Unified system only) -> Device. Backend Configuration --------------------- The following parameters need to be configured in `/etc/manila/manila.conf` for the VNX driver: emc_share_backend = vnx emc_nas_server = emc_nas_password = emc_nas_login = emc_nas_server_container = emc_nas_pool_name = share_driver = manila.share.drivers.emc.driver.EMCShareDriver - `emc_share_backend` is the plugin name. Set it to `vnx` for the VNX driver. - `emc_nas_server` is the control station IP address of the VNX system to be managed. - `emc_nas_password` and `emc_nas_login` fields are used to provide credentials to the VNX system. Only local users of VNX File is supported. - `emc_nas_server_container` field is the name of the Data Mover to serve the share service. - `emc_nas_pool_name` is the pool name user wants to create volume from. The pools can be created using Unisphere for VNX. Restart of :term:`manila-share` service is needed for the configuration changes to take effect. Restrictions ------------ The VNX driver has the following restrictions: - Only IP access type is supported for NFS. - Only user access type is supported for CIFS. - Only FLAT network and VLAN network are supported. - VLAN network is supported with limitations. The Neutron subnets in different VLANs that are used to create share networks cannot have overlapped address spaces. Otherwise, VNX may have a problem to communicate with the hosts in the VLANs. To create shares for different VLANs with same subnet address, use different Data Movers. - The 'Active Directory' security service is the only supported security service type and it is required to create CIFS shares. - Only one security service can be configured for each share network. - Active Directory domain name of the 'active_directory' security service should be unique even for different tenants. - The time on Data Mover and the Active Directory domains used in security services should be in sync (time difference should be less than 10 minutes). It is recommended to use same NTP server on both the Data Mover and Active Directory domains. - On VNX the snapshot is stored in the SavVols. VNX system allows the space used by SavVol to be created and extended until the sum of the space consumed by all SavVols on the system exceeds the default 20% of the total space available on the system. If the 20% threshold value is reached, an alert will be generated on VNX. Continuing to create snapshot will cause the old snapshot to be inactivated (and the snapshot data to be abandoned). The limit percentage value can be changed manually by storage administrator based on the storage needs. Administrator is recommended to configure the notification on the SavVol usage. Refer to `Using VNX SnapSure` document on [EMC support site](http://support.emc.com) for more information. - VNX has limitations on the overall numbers of Virtual Data Movers, filesystems, shares, checkpoints, and etc. Virtual Data Mover(VDM) is created by the VNX driver on the VNX to serve as the manila share server. Similarly, filesystem is created, mounted, and exported from the VDM over CIFS or NFS protocol to serve as the manila share. The VNX checkpoint serves as the manila share snapshot. Refer to the `NAS Support Matrix` document on [EMC support site](http://support.emc.com) for the limitations and configure the quotas accordingly. The :mod:`manila.share.drivers.emc.driver` Module ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ .. automodule:: manila.share.drivers.emc.driver :noindex: :members: :undoc-members: :show-inheritance: The :mod:`manila.share.drivers.emc.plugins.vnx.connection` Module ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ .. automodule:: manila.share.drivers.emc.plugins.vnx.connection :noindex: :members: :undoc-members: :show-inheritance: