Create an LVM software RAID level 1 (raid1)¶
This feature is available as Technology Preview. Use such configuration for testing and evaluation purposes only. For the Technology Preview feature definition, refer to Technology Preview features.
The EFI system partition
partflags: ['esp'] must be
a physical partition in the main partition table of the disk, not under
LVM or mdadm software RAID.
During configuration of your custom bare metal host profile,
you can create an LVM-based software RAID device
raid1 by adding
type: raid1 to the
logicalVolume spec in
For the LVM RAID parameters description, refer to API: BareMetalHostProfile spec.
For a bare metal host profile configuration, refer to Create a custom bare metal host profile.
logicalVolume spec of the
raid1 type requires
at least two devices (partitions) in
volumeGroup where you
build a logical volume. For an LVM of the
one device is enough.
raid1 requires additional space to store the
metadata on a volume group, roughly 4 MB for each partition.
Therefore, you cannot create a logical volume of exactly the same
size as the partitions it works on.
For example, if you have two partitions of 10 GiB, the corresponding
raid1 logical volume size will be less than 10 GiB. For that
reason, you can either set
size: 0 to use all available space
on the volume group, or set a smaller size than the partition size.
For example, use
size: 9.9Gi instead of
for the logical volume.
The following example illustrates an extract of
/ on the LVM
... devices: - device: byName: /dev/sda minSize: 200Gi type: hdd wipe: true partitions: - name: root_part1 size: 120Gi partitions: - name: rest_sda size: 0 - device: byName: /dev/sdb minSize: 200Gi type: hdd wipe: true partitions: - name: root_part2 size: 120Gi partitions: - name: rest_sdb size: 0 volumeGroups: - name: vg-root devices: - partition: root_part1 - partition: root_part2 - name: vg-data devices: - partition: rest_sda - partition: rest_sdb logicalVolumes: - name: root type: raid1 ## <-- LVM raid1 vg: vg-root size: 119.9Gi - name: data type: linear vg: vg-data size: 0 fileSystems: - fileSystem: ext4 logicalVolume: root mountPoint: / mountOpts: "noatime,nodiratime" - fileSystem: ext4 logicalVolume: data mountPoint: /mnt/data
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
wipe field is always considered
true for these devices.
false value is ignored.
Therefore, to prevent data loss, move the necessary data from these file systems to another server beforehand, if required.