Ok. I got it.
volume manager created /boot partition on mirrored raid by default.
https://github.com/openstack/fuel-web/blob/stable/7.0/nailgun/nailgun/extensions/volume_manager/manager.py#L605-L618
If node has more than 1 disks, then boot_is_raid becomes True, and /boot partition will be placed on MD raid constructed from 200M partitions from all of the disks.
Therefore, It's not a fuel-agent's issue.
Ok. I got it.
volume manager created /boot partition on mirrored raid by default.
https:/ /github. com/openstack/ fuel-web/ blob/stable/ 7.0/nailgun/ nailgun/ extensions/ volume_ manager/ manager. py#L605- L618
If node has more than 1 disks, then boot_is_raid becomes True, and /boot partition will be placed on MD raid constructed from 200M partitions from all of the disks.
Therefore, It's not a fuel-agent's issue.