HP 3PAR Driver

The HP 3PAR Manila driver provides NFS and CIFS shared file systems to OpenStack using HP 3PAR’s File Persona capabilities.

Supported Operations

The following operations are supported with HP 3PAR File Persona:

• Create/delete NFS and CIFS shares
  • Shares are not accessible until access rules allow access
• Allow/deny NFS share access
  • IP access rules are required for NFS share access
  • User access rules are not allowed for NFS shares
  • Access level (RW/RO) is ignored
  • Shares created from snapshots are always read-only
  • Shares not created from snapshots are read-write (and subject to ACLs)
• Allow/deny CIFS share access
  • Both IP and user access rules are required for CIFS share access
  • User access requires a 3PAR local user (LDAP and AD is not yet supported)
  • Access level (RW/RO) is ignored
  • Shares created from snapshots are always read-only
  • Shares not created from snapshots are read-write (and subject to ACLs)
• Create/delete snapshots
• Create shares from snapshots
  • Shares created from snapshots are always read-only

Share networks are not supported. Shares are created directly on the 3PAR without the use of a share server or service VM. Network connectivity is setup outside of Manila.

Requirements

On the system running the Manila share service:

• hp3parclient version 3.2.1 or newer from PyPI

On the HP 3PAR array:

• HP 3PAR Operating System software version 3.2.1 MU3 or higher
• A license that enables the File Persona feature
• The array class and hardware configuration must support File Persona

Pre-Configuration on the HP 3PAR

• HP 3PAR File Persona must be initialized and started (startfs)
• A File Provisioning Group (FPG) must be created for use with Manila
• A Virtual File Server (VFS) must be created for the FPG
• The VFS must be configured with an appropriate share export IP address
• A local user in the Administrators group is needed for CIFS shares

Backend Configuration

The following parameters need to be configured in the Manila configuration file for the HP 3PAR driver:

• share_backend_name = <backend name to enable>
• share_driver = manila.share.drivers.hp.hp_3par_driver.HP3ParShareDriver
• driver_handles_share_servers = False
• hp3par_fpg = <FPG to use for share creation>
• hp3par_share_ip_address = <IP address to use for share export location>
• hp3par_san_ip = <IP address for SSH access to the SAN controller>
• hp3par_api_url = <3PAR WS API Server URL>
• hp3par_username = <3PAR username with the ‘edit’ role>
• hp3par_password = <3PAR password for the user specified in hp3par_username>
• hp3par_san_login = <Username for SSH access to the SAN controller>
• hp3par_san_password = <Password for SSH access to the SAN controller>
• hp3par_debug = <False or True for extra debug logging>

The hp3par_share_ip_address must be a valid IP address for the configured FPG’s VFS. This IP address is used in export locations for shares that are created. Networking must be configured to allow connectivity from clients to shares.

Restart of manila-share service is needed for the configuration changes to take effect.

Network Approach

Connectivity between the storage array (SSH/CLI and WSAPI) and the Manila host is required for share management.

Connectivity between the clients and the VFS is required for mounting and using the shares. This includes:

• Routing from the client to the external network
• Assigning the client an external IP address (e.g., a floating IP)
• Configuring the Manila host networking properly for IP forwarding
• Configuring the VFS networking properly for client subnets

Share Types

When creating a share, a share type can be specified to determine where and how the share will be created. If a share type is not specified, the default_share_type set in the Manila configuration file is used.

Manila 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 (share networks) capability. For the HP 3PAR driver, this must be set to False.

Another common Manila extra-spec used to determine where a share is created is share_backend_name. When this extra-spec is defined in the share type, the share will be created on a backend with a matching share_backend_name.

The HP 3PAR driver automatically reports capabilities based on the FPG used for each backend. Share types with extra specs can be created by an administrator to control which share types are allowed to use FPGs with or without specific capabilities. The following extra-specs are used with the capabilities filter and the HP 3PAR driver:

• hp3par_flash_cache = ‘<is> True’ or ‘<is> False’
• thin_provisioning = ‘<is> True’ or ‘<is> False’
• dedupe = ‘<is> True’ or ‘<is> False’

hp3par_flash_cache will be reported as True for backends that have 3PAR’s Adaptive Flash Cache enabled.

thin_provisioning will be reported as True for backends that use thin provisioned volumes. FPGs that use fully provisioned volumes will report False. Backends that use thin provisioning also support Manila’s over-subscription feature.

dedupe will be reported as True for backends that use deduplication technology.

Scoped extra-specs are used to influence vendor-specific implementation details. Scoped extra-specs use a prefix followed by a colon. For HP 3PAR these extra-specs have a prefix of hp3par.

The following HP 3PAR extra-specs are used when creating CIFS (SMB) shares:

• hp3par:smb_access_based_enum = true or false
• hp3par:smb_continuous_avail = true or false
• hp3par:smb_cache = off, manual, optimized or auto

smb_access_based_enum (Access Based Enumeration) specifies if users can see only the files and directories to which they have been allowed access on the shares. The default is false.

smb_continuous_avail (Continuous Availability) specifies if SMB3 continuous availability features should be enabled for this share. If not specified, the default is true. This setting will be ignored with hp3parclient 3.2.1 or earlier.

smb_cache specifies client-side caching for offline files. Valid values are:

• off: The client must not cache any files from this share. The share is configured to disallow caching.
• manual: The client must allow only manual caching for the files open from this share.
• optimized: The client may cache every file that it opens from this share. Also, the client may satisfy the file requests from its local cache. The share is configured to allow automatic caching of programs and documents.
• auto: The client may cache every file that it opens from this share. The share is configured to allow automatic caching of documents.
• If this is not specified, the default is manual.

The following HP 3PAR extra-specs are used when creating NFS shares:

• hp3par:nfs_options = Comma separated list of NFS export options

The NFS export options have the following limitations:

• ro and rw are not allowed (Manila will determine the read-only option)
• no_subtree_check and fsid are not allowed per HP 3PAR CLI support
• (in)secure and (no_)root_squash are not allowed because the HP 3PAR driver controls those settings

All other NFS options are forwarded to the HP 3PAR as part of share creation. The HP 3PAR will do additional validation at share creation time. Refer to HP 3PAR CLI help for more details.

The manila.share.drivers.hp.hp_3par_driver Module

HP 3PAR Driver for OpenStack Manila.

class HP3ParShareDriver(*args, **kwargs)

Bases: manila.share.driver.ShareDriver

HP 3PAR driver for Manila.

Supports NFS and CIFS protocols on arrays with File Persona.

Version history:

1.0.00 - Begin Liberty development (post-Kilo) 1.0.01 - Report thin/dedup/hp_flash_cache capabilities 1.0.02 - Add share server/share network support

VERSION = '1.0.02'

allow_access(context, share, access, share_server=None)

Allow access to the share.

static build_share_comment(share)

Create an informational only comment to help admins and testers.

check_for_setup_error()

create_share(context, share, share_server=None)

Is called to create share.

create_share_from_snapshot(context, share, snapshot, share_server=None)

Is called to create share from snapshot.

create_snapshot(context, snapshot, share_server=None)

Creates a snapshot of a share.

delete_share(context, share, share_server=None)

Deletes share and its fstore.

delete_snapshot(context, snapshot, share_server=None)

Deletes a snapshot of a share.

deny_access(context, share, access, share_server=None)

Deny access to the share.

do_setup(context)

Any initialization the share driver does while starting.

ensure_share(context, share, share_server=None)

get_network_allocations_number()

static sha1_hash(clazz)

Get the SHA1 hash for the source of a class.