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Enable LVM block storage¶

TechPreview

Note

Consider this section as part of Deploy an OpenStack cluster.

This section instructs you on how to configure LVM as a backend for the OpenStack Block Storage service.

You can use flexible size units throughout bare metal host profiles: Ki, Mi, Gi, and so on. For example, size: 100Mi or size: 1.5Gi that will be serialized as 1536Mi. The size without units is counted in bytes. For example, size: 120 means 120 bytes.

Warning

All data will be wiped during cluster deployment on devices defined directly or indirectly in the fileSystems list of BareMetalHostProfile. For example:

A raw device partition with a file system on it
A device partition in a volume group with a logical volume that has a file system on it
An mdadm RAID device with a file system on it
An LVM RAID device with a file system on it

The wipe field is always considered true for these devices. The false value is ignored.

Therefore, to prevent data loss, move the necessary data from these file systems to another server beforehand, if required.

To enable LVM block storage:

Open BareMetalHostProfile for editing.

In the spec:volumeGroups section, specify the following data for the OpenStack compute nodes. In the following example, we deploy a Cinder volume with LVM on compute nodes. However, you can use dedicated nodes for this purpose.

spec:
  devices:
    - device:
        byName: /dev/nvme0n1
        minSize: 30Gi
        wipe: true
      partitions:
        - name: lvm_cinder_vol
          size: 0
          wipe: true
  volumeGroups:
    - devices:
      - partition: lvm_cinder_vol
      name: cinder-vol

For details about BareMetalHostProfile, see Operations Guide: Create a custom host profile.

Configure the OpenStackDeployment CR to deploy OpenStack with LVM block storage. For example:

spec:
  nodes:
    rockoon-openstack-compute-node::enabled:
      features:
        cinder:
          volume:
            backends:
              lvm:
                lvm:
                  volume_group: "cinder-vol"