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Hitachi NAS Platform File Services Driver for
OpenStack

Driver Version 3.0

Hitachi NAS Platform
Storage Requirements

This Hitachi NAS Platform File Services Driver for OpenStack provides
support for Hitachi NAS Platform (HNAS) models 3080, 3090, 4040, 4060,
4080 and 4100 with NAS OS 12.2 or higher. Before configuring the driver,
ensure the HNAS has at least:

  • 1 storage pool (span) configured.
  • 1 EVS configured.
  • 1 file system in this EVS, created without replication target option
    and should be in mounted state. It is recommended to disable
    auto-expansion, because the scheduler uses the current free space
    reported by the file system when creating shares.
  • 1 Management User configured with “supervisor” permission
    level.
  • Hitachi NAS Management interface should be reachable from
    manila-share node.

Also, if the driver is going to create CIFS shares, either LDAP
servers or domains must be configured previously in HNAS to provide the
users and groups.

Supported Operations

The following operations are supported in this version of Hitachi NAS
Platform File Services Driver for OpenStack:

  • Create and delete CIFS and NFS shares;
  • Extend and shrink shares;
  • Manage rules to shares (allow/deny access);
  • Allow and deny share access;
    • IP access type supported for NFS
      shares;
    • User access type supported for CIFS
      shares;
    • Both RW and RO access level are supported
      for NFS and CIFS shares;
  • Manage and unmanage shares;
  • Create and delete snapshots;
  • Create shares from snapshots.

Driver Configuration

This document contains the installation and user guide of the Hitachi
NAS Platform File Services Driver for OpenStack. Although mentioning
some Shared File Systems service operations and HNAS commands, both are
not in the scope of this document. Please refer to their own guides for
details.

Before configuring the driver, make sure that the nodes running the
manila-share service have access to the HNAS management port, and
compute and network nodes have access to the data ports (EVS IPs or
aggregations).

The driver configuration can be summarized in the following
steps:

  1. Configure HNAS parameters on manila.conf;
  2. Prepare the network ensuring all OpenStack-HNAS connections
    mentioned above;
  3. Configure/create share type;
  4. Restart the services;
  5. Configure OpenStack networks.

Step 1 – HNAS Parameters
Configuration

The following parameters need to be configured in the [DEFAULT]
section of /etc/manila/manila.conf:

Option

Description

enabled_share_backendsName of the section on manila.conf used to specify a
backend. For example: enabled_share_backends = hnas1
enabled_share_protocolsSpecify a list of protocols to be allowed for share creation. This
driver version supports NFS and/or CIFS.

The following parameters need to be configured in the [backend]
section of /etc/manila/manila.conf:

Option

Description

share_backend_nameA name for the backend.
share_driverPython module path. For this driver this must be:
manila.share.drivers.hitachi.hnas.driver.HitachiHNASDriver
driver_handles_share_serversDriver working mode. For this driver this must be:
False.
hitachi_hnas_ipHNAS management interface IP for communication between manila-share
node and HNAS.
hitachi_hnas_userThis field is used to provide user credential to HNAS. Provided
management user must have “supervisor” level.
hitachi_hnas_passwordThis field is used to provide password credential to HNAS. Either
hitachi_hnas_password or hitachi_hnas_ssh_private_key must be set.
hitachi_hnas_ssh_private_keySet this parameter with RSA/DSA private key path to allow the driver
to connect into HNAS.
hitachi_hnas_evs_idID from EVS which this backend is assigned to (ID can be listed by
CLI “evs list” or EVS Management in HNAS Interface).
hitachi_hnas_evs_ipEVS IP for mounting shares (this can be listed by CLI “evs list” or
EVS Management in HNAS interface).
hitachi_hnas_file_system_nameName of the file system in HNAS, located in the specified EVS.
hitachi_hnas_cluster_admin_ip0*If HNAS is in a multi-farm (one SMU managing multiple HNAS)
configuration, set this parameter with the IP of the cluster’s admin
node.
hitachi_hnas_stalled_job_timeout*Tree-clone-job commands are used to create snapshots and create
shares from snapshots. This parameter sets a timeout (in seconds) to
wait for jobs to complete. Default value is 30 seconds.
hitachi_hnas_driver_helper*Python module path for the driver helper. For this driver, it should
use (default value):
manila.share.drivers.hitachi.hnas.ssh.HNASSSHBackend
hitachi_hnas_allow_cifs_snapshot_while_mounted*By default, CIFS snapshots are not allowed to be taken while the
share has clients connected because point-in-time replica cannot be
guaranteed for all files. This parameter can be set to True to
allow snapshots to be taken while the share has clients connected.
WARNING: Setting this parameter to True might
cause inconsistent snapshots on CIFS shares. Default value is
False.

* Non mandatory parameters.

Below is an example of a valid configuration of HNAS driver:

[DEFAULT]``
...
enabled_share_backends = hitachi1
enabled_share_protocols = CIFS,NFS
...

[hitachi1]
share_backend_name = HITACHI1
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

Step 2 – Prepare the Network

In the driver mode used by Hitachi NAS Platform File Services Driver
for OpenStack, driver_handles_share_servers (DHSS) as False, the driver
does not handle network configuration, it is up to the administrator to
configure it. It is mandatory that HNAS management interface is
reachable from a manila-share node through admin network, while the
selected EVS data interface is reachable from OpenStack Cloud, such as
through neutron flat networking. Here is a step-by-step of an example
configuration:

Manila-Share Node:
eth0: Admin Network, can ping HNAS management
interface.
eth1: Data Network, can ping HNAS EVS IP (data
interface). This interface is only required if you plan to use Share
Migration.
Network Node and Compute
Nodes:

eth0: Admin Network, can ping HNAS management
interface.
eth1: Data Network, can ping HNAS EVS IP (data
interface).

The following image represents the described scenario:

image

Run in Network Node:

$ sudo ifconfig eth1 0
$ sudo ovs-vsctl add-br br-eth1
$ sudo ovs-vsctl add-port br-eth1 eth1
$ sudo ifconfig eth1 up

Edit /etc/neutron/plugins/ml2/ml2_conf.ini (default
directory), change the following settings as follows in their respective
tags:

[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 in the
Compute Node, if it exists is located in:
/etc/neutron/plugins/openvswitch/ovs_neutron_plugin.ini.

Create a route in HNAS to the tenant network. Please make sure
multi-tenancy is enabled and routes are configured per EVS. Use the
command “route-net-add” in HNAS console, where the network parameter
should be the tenant’s private network, while the gateway parameter
should be the flat network gateway and the “console-context –evs”
parameter should be the ID of EVS in use, such as in the following
example:

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

Step 3 – Share Type
Configuration

Shared File Systems service requires that the share type includes the
driver_handles_share_servers extra-spec. This ensures that the share
will be created on a backend that supports the requested
driver_handles_share_servers capability. For the Hitachi NAS Platform
File Services Driver for OpenStack this must be set to False.

$ manila type-create hitachi False

Additionally, the driver also reports the following common
capabilities that can be specified in the share type:

Capability

Description

thin_provisioning = TrueAll shares created on HNAS are always thin provisioned. So, if you
set it, the value must be: True.
dedupe = True/FalseHNAS supports deduplication on its file systems and the driver will
report dedupe=True if it is enabled on the file system being
used. To use it, go to HNAS and enable the feature on the file system
used.

To specify a common capability on the share type, use the
type-key command, for example:

$ manila type-key hitachi set dedupe=True

Step 4 – Restart the
Services

Restart all Shared File Systems services (manila-share,
manila-scheduler and manila-api) and neutron services (neutron-*). This
step is specific to your environment. If you are running in devstack for
example, you have to log into screen (screen -r), stop the
process (Ctrl^C) and run it again. If you are running it in
a distro like RHEL or SUSE, a service command (for example service
manila-api restart
) is used to restart the service.

Step 5 – Configure
OpenStack Networks

In Neutron Controller it is necessary to create a network, a subnet
and to add this subnet interface to a router:

Create a network to the given tenant (demo), providing the DEMO_ID
(this can be fetched using keystone tenant-list), 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:

$ neutron net-create --tenant-id <DEMO_ID> hnas_network
--provider:physical_network=physnet2 --provider:network_type=flat

Create a subnet to same tenant (demo), providing the DEMO_ID (this
can be fetched using keystone tenant-list), the gateway IP of
this subnet, a name for the subnet, the network ID created on previously
step (this can be fetched using neutron net-list) and CIDR of
subnet:

$ neutron subnet-create --tenant-id <DEMO_ID> --gateway <GATEWAY>
--name hnas_subnet <NETWORK_ID> <SUBNET_CIDR>

Finally, add the subnet interface to a router, providing the router
ID and subnet ID created on previously step (can be fetched using
neutron subnet-list):

$ neutron router-interface-add <ROUTER_ID> <SUBNET_ID>

Manage and Unmanage Shares

Manila 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 manila share. Hitachi NAS Platform File Services
Driver for OpenStack use virtual-volumes (V-VOLs) to create shares. Only
V-VOLs with a quota limit can be used by the driver, also, they must be
created or moved inside the directory ‘/shares/’ and exported (as NFS or
CIFS shares). The unmanage operation only unlinks the share from
OpenStack, preserving all data in the share.

To manage shares use:

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

Where:

Parameter

Description
service_hostManila host, backend and share name. For example
ubuntu@hitachi1#HITACHI1. The available hosts can be listed with the
command: manila pool-list (admin only).

protocol

NFS or CIFS protocols are currently supported.

export_path

The export path of the share. For example:
172.24.44.31:/shares/some_share_id

To unmanage a share use:

$ manila unmanage <share_id>

Where:

Parameter

Description

share_id

Manila ID of the share to be unmanaged. This list can be
fetched with: manila list.

Additional Notes

  • HNAS has some restrictions about the number of EVSs, file systems,
    virtual-volumes and simultaneous SSC connections. Check the manual
    specification for your system.
  • Shares and snapshots are thin provisioned. It is reported to manila
    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.
  • Admins should manage the tenant’s quota (manila
    quota-update
    ) to control the backend usage.
  • By default, CIFS snapshots are disabled when the share is mounted,
    since it uses tree-clone to create snapshots and does not guarantee
    point-in-time replicas when the source directory tree is changing, also,
    changing permissions to read-only does not affect already
    mounted shares. So, enable it if your source directory can be static
    while taking snapshots. Currently, it affects only CIFS protocol. For
    more information check the tree-clone feature in HNAS with man
    tree-clone
    .

The manila.share.drivers.hitachi.hnas.driver Module

manila.share.drivers.hitachi.hnas.driver

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