第2章 Preparing Ceph Storage nodes for overcloud deployment
All nodes in this scenario are bare metal systems using IPMI for power management. These nodes do not require an operating system because the director copies a Red Hat Enterprise Linux 8 image to each node. Additionally, the Ceph Storage services on these nodes are containerized. The director communicates to each node through the Provisioning network during the introspection and provisioning processes. All nodes connect to this network through the native VLAN.
2.1. Cleaning Ceph Storage node disks
The Ceph Storage OSDs and journal partitions require GPT disk labels. This means the additional disks on Ceph Storage require conversion to GPT before installing the Ceph OSD services. You must delete all metadata from the disks to allow the director to set GPT labels on them.
You can configure the director to delete all disk metadata by default by adding the following setting to your /home/stack/undercloud.conf file:
clean_nodes=true
With this option, the Bare Metal Provisioning service runs an additional step to boot the nodes and clean the disks each time the node is set to available. This process adds an additional power cycle after the first introspection and before each deployment. The Bare Metal Provisioning service uses the wipefs --force --all command to perform the clean.
After setting this option, run the openstack undercloud install command to execute this configuration change.
The wipefs --force --all command deletes all data and metadata on the disk, but does not perform a secure erase. A secure erase takes much longer.