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 back end for the OpenStack Block Storage service.

Since MOSK 22.4, you can use flexible size units throughout bare metal host profiles. For example, you can now use either sizeGiB: 0.1 or size: 100Mi when specifying a device size.

Mirantis recommends using only one parameter name type and units throughout the configuration files. If both sizeGiB and size are used, sizeGiB is ignored during deployment and the suffix is adjusted accordingly. For example, 1.5Gi will be serialized as 1536Mi. The size without units is counted in bytes. For example, size: 120 means 120 bytes.

To enable LVM block storage:

1. Open BareMetalHostProfile for editing.

2. 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
     logicalVolumes:
       - name: cinder-fake
         vg: cinder-vol
         size: 100Mi
     fileSystems:
       - fileSystem: ext4
         logicalVolume: cinder-fake
         mountPoint: /cinder-fake
   

   Note

   Due to a limitation, volume groups cannot be created without logical volumes and formatted partitions. Therefore, set the logicalVolumes:name, fileSystems:logicalVolume, and fileSystems:mountPoint parameters to cinder-fake.

   For details about BareMetalHostProfile, see Mirantis Container Cloud Operations Guide: Create a custom bare metal host profile.

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

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