Red Hat Summit Red Hat SummitSupportConsoleDéveloppeursCommencer un essaiContact

Ce contenu n'est pas disponible dans la langue sélectionnée.

4.3. Planning Storage

The director provides different storage options for the Overcloud environment. This includes:
Ceph Storage Nodes
The director creates a set of scalable storage nodes using Red Hat Ceph Storage. The Overcloud uses these nodes for:
  • Images - OpenStack Glance manages images for VMs. Images are immutable. OpenStack treats images as binary blobs and downloads them accordingly. You can use OpenStack Glance to store images in a Ceph Block Device.
  • Volumes - OpenStack Cinder volumes are block devices. OpenStack uses volumes to boot VMs, or to attach volumes to running VMs. OpenStack manages volumes using Cinder services. You can use Cinder to boot a VM using a copy-on-write clone of an image.
  • Guest Disks - Guest disks are guest operating system disks. By default, when you boot a virtual machine with Nova, its disk appears as a file on the filesystem of the hypervisor (usually under /var/lib/nova/instances/<uuid>/). It is possible to boot every virtual machine inside Ceph directly without using Cinder, which is advantageous because it allows you to perform maintenance operations easily with the live-migration process. Additionally, if your hypervisor dies it is also convenient to trigger nova evacuate and run the virtual machine elsewhere almost seamlessly.

Important

If you want to boot virtual machines in Ceph (ephemeral backend or boot from volume), the glance image format must be RAW format. Ceph does not support other image formats such as QCOW2 or VMDK for hosting a virtual machine disk.
See Red Hat Ceph Storage Architecture Guide for additional information.
Cinder Storage Nodes
The director creates an external block storage node. This is useful in situations where you need to scale or replace controller nodes in your Overcloud environment but need to retain block storage outside of a high availability cluster.
Swift Storage Nodes
The director creates an external object storage node. This is useful in situations where you need to scale or replace controller nodes in your Overcloud environment but need to retain object storage outside of a high availability cluster.
Retour au début
Red Hat logoGithubredditYoutubeTwitter

Apprendre

Essayez, achetez et vendez

Communautés

À propos de la documentation Red Hat

Nous aidons les utilisateurs de Red Hat à innover et à atteindre leurs objectifs grâce à nos produits et services avec un contenu auquel ils peuvent faire confiance. Découvrez nos récentes mises à jour.

Rendre l’open source plus inclusif

Red Hat s'engage à remplacer le langage problématique dans notre code, notre documentation et nos propriétés Web. Pour plus de détails, consultez le Blog Red Hat.

À propos de Red Hat

Nous proposons des solutions renforcées qui facilitent le travail des entreprises sur plusieurs plates-formes et environnements, du centre de données central à la périphérie du réseau.

Theme

© 2025 Red Hat