Hitachi NAS (HNAS) driver

The HNAS driver provides NFS Shared File Systems to OpenStack.

Requirements

  • Hitachi NAS Platform Models 3080, 3090, 4040, 4060, 4080, and 4100.

  • HNAS/SMU software version is 12.2 or higher.

  • HNAS configuration and management utilities to create a storage pool (span) and an EVS.

    • GUI (SMU).

    • SSC CLI.

Supported shared filesystems and operations

The driver supports NFS and CIFS 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.

  • Revert a share to a snapshot.

  • Extend a share.

  • Manage a share.

  • Unmanage a share.

  • Shrink a share.

  • Mount snapshots.

  • Allow snapshot access.

  • Deny snapshot access.

  • Manage a snapshot.

  • Unmanage a snapshot.

Driver options

This table contains the configuration options specific to the share driver.

Description of HDS NAS share driver configuration options

Configuration option = Default value

Description

[DEFAULT]

hitachi_hnas_admin_network_ip = None

(String) Specify IP for mounting shares in the Admin network.

hitachi_hnas_allow_cifs_snapshot_while_mounted = False

(Boolean) By default, CIFS snapshots are not allowed to be taken when the share has clients connected because consistent point-in-time replica cannot be guaranteed for all files. Enabling this might cause inconsistent snapshots on CIFS shares.

hitachi_hnas_cluster_admin_ip0 = None

(String) The IP of the clusters admin node. Only set in HNAS multinode clusters.

hitachi_hnas_driver_helper = manila.share.drivers.hitachi.hnas.ssh.HNASSSHBackend

(String) Python class to be used for driver helper.

hitachi_hnas_evs_id = None

(Integer) Specify which EVS this backend is assigned to.

hitachi_hnas_evs_ip = None

(String) Specify IP for mounting shares.

hitachi_hnas_file_system_name = None

(String) Specify file-system name for creating shares.

hitachi_hnas_ip = None

(String) HNAS management interface IP for communication between Manila controller and HNAS.

hitachi_hnas_password = None

(String) HNAS user password. Required only if private key is not provided.

hitachi_hnas_ssh_private_key = None

(String) RSA/DSA private key value used to connect into HNAS. Required only if password is not provided.

hitachi_hnas_stalled_job_timeout = 30

(Integer) The time (in seconds) to wait for stalled HNAS jobs before aborting.

hitachi_hnas_user = None

(String) HNAS username Base64 String in order to perform tasks such as create file-systems and network interfaces.

[hnas1]

share_backend_name = None

(String) The backend name for a given driver implementation.

share_driver = manila.share.drivers.generic.GenericShareDriver

(String) Driver to use for share creation.

Pre-configuration on OpenStack deployment

  1. Install the OpenStack environment with manila. See the OpenStack installation guide.

  2. Configure the OpenStack networking so it can reach HNAS Management interface and HNAS EVS Data interface.

    Note

    In the driver mode used by HNAS Driver (DHSS = False), the driver does not handle network configuration, it is up to the administrator to configure it.

    • Configure the network of the manila-share node network to reach HNAS management interface through the admin network.

    • Configure the network of the Compute and Networking nodes to reach HNAS EVS data interface through the data network.

    • Example of networking architecture:

      Example networking scenario

    • Edit the /etc/neutron/plugins/ml2/ml2_conf.ini file and update the following settings in their respective tags. In case you use linuxbridge, update bridge mappings at linuxbridge section:

    Important

    It is mandatory that HNAS management interface is reachable from the Shared File System node through the admin network, while the selected EVS data interface is reachable from OpenStack Cloud, such as through Neutron flat networking.

    [ml2]
type_drivers = flat,vlan,vxlan,gre
mechanism_drivers = openvswitch
[ml2_type_flat]
flat_networks = physnet1,physnet2
[ml2_type_vlan]
network_vlan_ranges = physnet1:1000:1500,physnet2:2000:2500
[ovs]
bridge_mappings = physnet1:br-ex,physnet2:br-eth1

    You may have to repeat the last line above in another file on the Compute node, if it exists it is located in: /etc/neutron/plugins/openvswitch/ovs_neutron_plugin.ini.

    • In case openvswitch for neutron agent, run in network node:

      # ifconfig eth1 0
# ovs-vsctl add-br br-eth1
# ovs-vsctl add-port br-eth1 eth1
# ifconfig eth1 up

    • Restart all neutron processes.

  3. Create the data HNAS network in OpenStack:

    • List the available projects:

      $ openstack project list

    • Create a network to the given project (DEMO), providing the project name, a name for the network, the name of the physical network over which the virtual network is implemented, and the type of the physical mechanism by which the virtual network is implemented:

      $ openstack network create --project DEMO \
  --provider-network-type flat \
  --provider-physical-network physnet2 hnas_network

    • Optional: List available networks:

      $ openstack network list

    • Create a subnet to the same project (DEMO), the gateway IP of this subnet, a name for the subnet, the network name created before, and the CIDR of subnet:

      $ openstack subnet create --project DEMO --gateway GATEWAY \
  --subnet-range SUBNET_CIDR --network NETWORK HNAS_SUBNET

    • Optional: List available subnets:

      $ openstack subnet list

    • Add the subnet interface to a router, providing the router name and subnet name created before:

      $ openstack router add subnet SUBNET ROUTER

Pre-configuration on HNAS

  1. Create a file system on HNAS. See the Hitachi HNAS reference.

    Important

    Make sure that the filesystem is not created as a replication target. For more information, refer to the official HNAS administration guide.

  2. Prepare the HNAS EVS network.

    • Create a route in HNAS to the project network:

      $ console-context --evs <EVS_ID_IN_USE> route-net-add \
  --gateway <FLAT_NETWORK_GATEWAY> <TENANT_PRIVATE_NETWORK>

      Important

      Make sure multi-tenancy is enabled and routes are configured per EVS.

      $ console-context --evs 3 route-net-add --gateway 192.168.1.1 \
10.0.0.0/24

  3. Configure the CIFS security.

    • Before using CIFS shares with the HNAS driver, make sure to configure a security service in the back end. For details, refer to the Hitachi HNAS reference.

Back end configuration

  1. Configure HNAS driver.

    • Configure HNAS driver according to your environment. This example shows a minimal HNAS driver configuration:

      [DEFAULT]
enabled_share_backends = hnas1
enabled_share_protocols = NFS,CIFS

[hnas1]
share_backend_name = HNAS1
share_driver = manila.share.drivers.hitachi.hnas.driver.HitachiHNASDriver
driver_handles_share_servers = False
hitachi_hnas_ip = 172.24.44.15
hitachi_hnas_user = supervisor
hitachi_hnas_password = supervisor
hitachi_hnas_evs_id = 1
hitachi_hnas_evs_ip = 10.0.1.20
hitachi_hnas_file_system_name = FS-Manila
hitachi_hnas_cifs_snapshot_while_mounted = True

      Note

      The hds_hnas_cifs_snapshot_while_mounted parameter allows snapshots to be taken while CIFS shares are mounted. This parameter is set to False by default, which prevents a snapshot from being taken if the share is mounted or in use.

  2. Optional. HNAS multi-backend configuration.

    • Update the enabled_share_backends flag with the names of the back ends separated by commas.

    • Add a section for every back end according to the example bellow:

      [DEFAULT]
enabled_share_backends = hnas1,hnas2
enabled_share_protocols = NFS,CIFS

[hnas1]
share_backend_name = HNAS1
share_driver = manila.share.drivers.hitachi.hnas.driver.HitachiHNASDriver
driver_handles_share_servers = False
hitachi_hnas_ip = 172.24.44.15
hitachi_hnas_user = supervisor
hitachi_hnas_password = supervisor
hitachi_hnas_evs_id = 1
hitachi_hnas_evs_ip = 10.0.1.20
hitachi_hnas_file_system_name = FS-Manila1
hitachi_hnas_cifs_snapshot_while_mounted = True

[hnas2]
share_backend_name = HNAS2
share_driver = manila.share.drivers.hitachi.hnas.driver.HitachiHNASDriver
driver_handles_share_servers = False
hitachi_hnas_ip = 172.24.44.15
hitachi_hnas_user = supervisor
hitachi_hnas_password = supervisor
hitachi_hnas_evs_id = 1
hitachi_hnas_evs_ip = 10.0.1.20
hitachi_hnas_file_system_name = FS-Manila2
hitachi_hnas_cifs_snapshot_while_mounted = True

  3. Disable DHSS for HNAS share type configuration:

    Note

    Shared File Systems requires that the share type includes the driver_handles_share_servers extra-spec. This ensures that the share will be created on a back end that supports the requested driver_handles_share_servers capability.

    $ manila type-create hitachi False

  4. Optional: Add extra-specs for enabling HNAS-supported features:

    • These commands will enable various snapshot-related features that are supported in HNAS.

      $ manila type-key hitachi set snapshot_support=True
$ manila type-key hitachi set mount_snapshot_support=True
$ manila type-key hitachi set revert_to_snapshot_support=True
$ manila type-key hitachi set create_share_from_snapshot_support=True

    • To specify which HNAS back end will be created by the share, in case of multiple back end setups, add an extra-spec for each share-type to match a specific back end. Therefore, it is possible to specify which back end the Shared File System service will use when creating a share.

      $ manila type-key hitachi set share_backend_name=hnas1
$ manila type-key hitachi2 set share_backend_name=hnas2

  5. Restart all Shared File Systems services (manila-share, manila-scheduler and manila-api).

Share migration

Extra configuration is needed for allowing shares to be migrated from or to HNAS. In the OpenStack deployment, the manila-share node needs an additional connection to the EVS data interface. Furthermore, make sure to add hitachi_hnas_admin_network_ip to the configuration. This should match the value of data_node_access_ips. For more in-depth documentation, refer to the share migration documents

Manage and unmanage shares

Shared File Systems has the ability to manage and unmanage shares. If there is a share in the storage and it is not in OpenStack, you can manage that share and use it as a Shared File Systems share. Administrators have to make sure the exports are under the /shares folder beforehand. HNAS drivers use virtual-volumes (V-VOL) to create shares. Only V-VOL shares can be used by the driver, and V-VOLs must have a quota limit. If the NFS export is an ordinary FS export, it is not possible to use it in Shared File Systems. The unmanage operation only unlinks the share from Shared File Systems, all data is preserved. Both manage and unmanage operations are non-disruptive by default, until access rules are modified.

To manage a share, use:

$ manila manage [--name <name>] [--description <description>]
                [--share_type <share-type>]
                [--driver_options [<key=value> [<key=value> ...]]]
                [--public]
                <service_host> <protocol> <export_path>

Where:

Parameter

Description

service_host

Manila host, back end and share name. For example, ubuntu@hitachi1#hsp1. The available hosts can be listed with the command: manila pool-list (admin only).

protocol

Protocol of share to manage, such as NFS or CIFS.

export_path
Share export path.

For NFS: 10.0.0.1:/shares/share_name

For CIFS: \\10.0.0.1\share_name

Note

For NFS exports, export_path must include /shares/ after the target address. Trying to reference the share name directly or under another path will fail.

Note

For CIFS exports, although the shares will be created under the /shares/ folder in the back end, only the share name is needed in the export path. It should also be noted that the backslash \ character has to be escaped when entered in Linux terminals.

For additional details, refer to manila help manage.

To unmanage a share, use:

$ manila unmanage <share>

Where:

Parameter

Description

share

ID or name of the share to be unmanaged. A list of shares can be fetched with manila list.

Manage and unmanage snapshots

The Shared File Systems service also has the ability to manage share snapshots. Existing HNAS snapshots can be managed, as long as the snapshot directory is located in /snapshots/share_ID. New snapshots created through the Shared File Systems service are also created according to this specific folder structure.

To manage a snapshot, use:

$ manila snapshot-manage [--name <name>] [--description <description>]
                         [--driver_options [<key=value> [<key=value> ...]]]
                         <share> <provider_location>

Where:

Parameter

Description

share

ID or name of the share to be managed. A list of shares can be fetched with manila list.

provider_location

Location of the snapshot on the back end, such as /snapshots/share_ID/snapshot_ID.

--driver_options

Driver-related configuration, passed such as size=10.

Note

The mandatory provider_location parameter uses the same syntax for both NFS and CIFS shares. This is only the case for snapshot management.

Note

The --driver_options parameter size is required for the HNAS driver. Administrators need to know the size of the to-be-managed snapshot beforehand.

Note

If the mount_snapshot_support=True extra-spec is set in the share type, the HNAS driver will automatically create an export when managing a snapshot if one does not already exist.

To unmanage a snapshot, use:

$ manila snapshot-unmanage <snapshot>

Where:

Parameter

Description

snapshot

Name or ID of the snapshot(s).

Additional notes

  • HNAS has some restrictions about the number of EVSs, filesystems, virtual-volumes, and simultaneous SSC connections. Check the manual specification for your system.

  • Shares and snapshots are thin provisioned. It is reported to Shared File System only the real used space in HNAS. Also, a snapshot does not initially take any space in HNAS, it only stores the difference between the share and the snapshot, so it grows when share data is changed.

  • Administrators should manage the project’s quota (manila quota-update) to control the back end usage.

  • Shares will need to be remounted after a revert-to-snapshot operation.