Default configuration of the host system storage¶

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

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.
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.
Ceph storage device
This device is used as a Ceph datastore or Ceph OSD on managed clusters.

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 backend on managed clusters.