Default configuration of the host system storage

The default host profile requires three storage devices in the following strict order:

  1. Boot device and operating system storage

    This device contains boot data and operating system data. It is partitioned using the GUID Partition Table (GPT) labels. The root file system is an ext4 file system created on top of an LVM logical volume. For a detailed layout, refer to the table below.

  2. Local volumes device

    This device contains an ext4 file system with directories mounted as persistent volumes to Kubernetes. These volumes are used by the Mirantis Container Cloud services to store its data, including monitoring and identity databases.

  3. Ceph storage device

    This device is used as a Ceph datastore or Ceph OSD.

The following table summarizes the default configuration of the host system storage set up by the Container Cloud bare metal management.

Default configuration of the bare metal host storage

Device/partition

Name/Mount point

Recommended size, GB

Description

/dev/sda1

bios_grub

4 MiB

The mandatory GRUB boot partition required for non-UEFI systems.

/dev/sda2

UEFI -> /boot/efi

0.2 GiB

The boot partition required for the UEFI boot mode.

/dev/sda3

config-2

64 MiB

The mandatory partition for the cloud-init configuration. Used during the first host boot for initial configuration.

/dev/sda4

lvm_root_part

100% of the remaining free space in the LVM volume group

The main LVM physical volume that is used to create the root file system.

/dev/sdb

lvm_lvp_part -> /mnt/local-volumes

100% of the remaining free space in the LVM volume group

The LVM physical volume that is used to create the file system for LocalVolumeProvisioner.

/dev/sdc

-

100% of the remaining free space in the LVM volume group

Clean raw disk that will be used for the Ceph storage back end.

Now, proceed to Create MOS host profiles.