Add a Physical Volume

You can add a physical volume using the system host-pv-add command.

Prerequisites

• You must lock a host before you can modify its settings.

  ~(keystone_admin)$ system host-lock <hostname>
  

• A suitable local volume group must exist on the host. For more information, see Work with Physical Volumes.

• An unused disk or partition must be available on the host. For more information about partitions, see Work with Disk Partitions.

About this task

The command syntax is:

system host-pv-add <hostname> <groupname> <uuid>

where:

<hostname>

is the host name or ID.

<groupname>

is the name of the local volume group to include the physical volume.

<uuid>

is the identifier of the disk or partition to use.

You can specify the device node or the device path.

On a compute host with a single disk, you must assign a partition on the root disk for nova-local storage. This is required to support some small nova-local files. The host must not be used for VM local ephemeral storage.

On a compute host with more than one disk, it is possible to create a partition on the root disk for use as nova-local storage. However, for performance reasons, you must either use a non-root disk for nova-local storage, or ensure that the host is not used for VMs with ephemeral local storage.

For example, to add a volume with the UUID 67b368ab-626a-4168-9b2a-d1d239d4f3b0 to compute-1, use the following command.

~(keystone_admin)$ system host-pv-add compute-1 nova-local 67b368ab-626a-4168-9b2a-d1d239d4f3b0
+--------------------------+--------------------------------------------------+
| Property                 | Value                                            |
+--------------------------+--------------------------------------------------+
| uuid                     | 1145ac0b-5be1-416c-a080-581fa95fce77             |
| pv_state                 | adding                                           |
| pv_type                  | partition                                        |
| disk_or_part_uuid        | 67b368ab-626a-4168-9b2a-d1d239d4f3b0             |
| disk_or_part_device_node | /dev/sdb5                                        |
| disk_or_part_device_path | /dev/disk/by-path/pci-0000:00:0d.0-ata-2.0-part5 |
| lvm_pv_name              | /dev/sdb5                                        |
| lvm_vg_name              | nova-local                                       |
| lvm_pv_uuid              | None                                             |
| lvm_pv_size              | 0                                                |
| lvm_pe_total             | 0                                                |
| lvm_pe_alloced           | 0                                                |
| ihost_uuid               | 3b315241-d54f-499b-8566-a6ed7d2d6b39             |
| created_at               | 2017-09-08T21:14:00.217360+00:00                 |
| updated_at               | None                                             |
+--------------------------+--------------------------------------------------+