HPE LeftHand/StoreVirtual driver¶

System requirements¶

To use the HPE LeftHand/StoreVirtual driver, do the following:

• Install LeftHand/StoreVirtual Operating System software version 11.5 or higher on the HPE LeftHand/StoreVirtual storage system.
• Create a cluster group.
• Install the python-lefthandclient version 2.1.0 from the Python Package Index on the system with the enabled Block Storage service volume drivers.

Supported operations¶

• Create, delete, attach, and detach volumes.
• Create, list, and delete volume snapshots.
• Create a volume from a snapshot.
• Copy an image to a volume.
• Copy a volume to an image.
• Clone a volume.
• Extend a volume.
• Get volume statistics.
• Migrate a volume with back-end assistance.
• Retype a volume.
• Manage and unmanage a volume.
• Manage and unmanage a snapshot.
• Replicate host volumes.
• Fail-over host volumes.
• Fail-back host volumes.
• Create, delete, update, snapshot, and clone generic volume groups.
• Create and delete generic volume group snapshots.
• Create a generic volume group from a group snapshot or another group.

When you use back end assisted volume migration, both source and destination clusters must be in the same HPE LeftHand/StoreVirtual management group. The HPE LeftHand/StoreVirtual array will use native LeftHand APIs to migrate the volume. The volume cannot be attached or have snapshots to migrate.

Volume type support for the driver includes the ability to set the following capabilities in the Block Storage API cinder.api.contrib.types_extra_specs volume type extra specs extension module.

• hpelh:provisioning
• hpelh:ao
• hpelh:data_pl

To work with the default filter scheduler, the key-value pairs are case-sensitive and scoped with hpelh:. For information about how to set the key-value pairs and associate them with a volume type, run the following command:

$ openstack help volume type

• The following keys require the HPE LeftHand/StoreVirtual storage array be configured for:

  hpelh:ao

  The HPE LeftHand/StoreVirtual storage array must be configured for Adaptive Optimization.

  hpelh:data_pl

  The HPE LeftHand/StoreVirtual storage array must be able to support the Data Protection level specified by the extra spec.

• If volume types are not used or a particular key is not set for a volume type, the following defaults are used:

  hpelh:provisioning

  Defaults to thin provisioning, the valid values are, thin and full

  hpelh:ao

  Defaults to true, the valid values are, true and false.

  hpelh:data_pl

  Defaults to r-0, Network RAID-0 (None), the valid values are,

  • r-0, Network RAID-0 (None)
  • r-5, Network RAID-5 (Single Parity)
  • r-10-2, Network RAID-10 (2-Way Mirror)
  • r-10-3, Network RAID-10 (3-Way Mirror)
  • r-10-4, Network RAID-10 (4-Way Mirror)
  • r-6, Network RAID-6 (Dual Parity)

Enable the HPE LeftHand/StoreVirtual iSCSI driver¶

The HPELeftHandISCSIDriver is installed with the OpenStack software.

1. Install the python-lefthandclient Python package on the OpenStack Block Storage system.

   $ pip install 'python-lefthandclient>=2.1,<3.0'
   

2. If you are not using an existing cluster, create a cluster on the HPE LeftHand storage system to be used as the cluster for creating volumes.

3. Make the following changes in the /etc/cinder/cinder.conf file:

   # LeftHand WS API Server URL
   hpelefthand_api_url=https://10.10.0.141:8081/lhos
   
   # LeftHand Super user username
   hpelefthand_username=lhuser
   
   # LeftHand Super user password
   hpelefthand_password=lhpass
   
   # LeftHand cluster to use for volume creation
   hpelefthand_clustername=ClusterLefthand
   
   # LeftHand iSCSI driver
   volume_driver=cinder.volume.drivers.hpe.hpe_lefthand_iscsi.HPELeftHandISCSIDriver
   
   # Should CHAPS authentication be used (default=false)
   hpelefthand_iscsi_chap_enabled=false
   
   # Enable HTTP debugging to LeftHand (default=false)
   hpelefthand_debug=false
   
   # The ratio of oversubscription when thin provisioned volumes are
   # involved. Default ratio is 20.0, this means that a provisioned capacity
   # can be 20 times of the total physical capacity.
   max_over_subscription_ratio=20.0
   
   # This flag represents the percentage of reserved back-end capacity.
   reserved_percentage=15
   

   You can enable only one driver on each cinder instance unless you enable multiple back end support. See the Cinder multiple back end support instructions to enable this feature.

   If the hpelefthand_iscsi_chap_enabled is set to true, the driver will associate randomly-generated CHAP secrets with all hosts on the HPE LeftHand/StoreVirtual system. OpenStack Compute nodes use these secrets when creating iSCSI connections.

   Important

   CHAP secrets are passed from OpenStack Block Storage to Compute in clear text. This communication should be secured to ensure that CHAP secrets are not discovered.

   Note

   CHAP secrets are added to existing hosts as well as newly-created ones. If the CHAP option is enabled, hosts will not be able to access the storage without the generated secrets.

4. Save the changes to the cinder.conf file and restart the cinder-volume service.

The HPE LeftHand/StoreVirtual driver is now enabled on your OpenStack system. If you experience problems, review the Block Storage service log files for errors.