The controllers provide storage for the StarlingX OpenStack’s OpenStack Controller Services through a combination of local container Ephemeral disk, PVCs backed by Ceph and a containerized HA mariadb deployment.
On systems configured for controller storage with a small Ceph cluster on the master/controller nodes, they also provide persistent block storage for persistent VM volumes (Cinder), storage for VM images (Glance), and storage for VM remote Ephemeral volumes (Nova). On All-in-One Simplex or Duplex systems, the controllers also provide nova-local storage for Ephemeral VM volumes.
On systems configured for controller storage, the master/controller’s root disk is reserved for system use, and additional disks are required to support the small Ceph cluster. On a All-in-One Simplex or Duplex system, you have the option to partition the root disk for the nova-local storage (to realize a two-disk controller) or use a third disk for nova-local storage.
Underlying platform filesystem storage¶
To pass the disk-space checks, any replacement disks must be installed before the allotments are changed.
Glance, Cinder, and remote Nova storage¶
On systems configured for controller storage with a small Ceph cluster on the master/controller nodes, this small Ceph cluster on the controller provides Glance image storage, Cinder block storage, Cinder backup storage, and Nova remote Ephemeral block storage. For more information, see Block Storage for Virtual Machines.
Controllers on StarlingX OpenStack Simplex or Duplex systems incorporate the Compute function, and therefore provide nova-local storage for Ephemeral disks. On other systems, nova-local storage is provided by compute hosts. For more information about this type of storage, see Storage on Compute Hosts and Block Storage for Virtual Machines.
You can add a physical volume using the system host-pv-add command.
StarlingX OpenStack creates default Ceph storage pools for Glance images, Cinder volumes, Cinder backups, and Nova Ephemeral data. For more information, see the Platform Storage Configuration guide for details on configuring the internal Ceph cluster on either controller or storage hosts.
Compute-labelled worker hosts can provide Ephemeral storage for VM disks.
On All-in-One Simplex or Duplex systems, compute storage is provided using resources on the combined host.