diff --git a/doc/rbd/rbd-openstack.rst b/doc/rbd/rbd-openstack.rst index b37c018da9f..660757639aa 100644 --- a/doc/rbd/rbd-openstack.rst +++ b/doc/rbd/rbd-openstack.rst @@ -2,12 +2,14 @@ Block Devices and OpenStack ============================= -You may use Ceph block device images with OpenStack through ``libvirt``, which +.. index:: Ceph Block Device; OpenStack + +You may use Ceph Block Device images with OpenStack through ``libvirt``, which configures the QEMU interface to ``librbd``. Ceph stripes block device images as -objects across the cluster, which means that large Ceph block device images have +objects across the cluster, which means that large Ceph Block Device images have better performance than a standalone server! -To use Ceph block devices with OpenStack, you must install QEMU, ``libvirt``, +To use Ceph Block Devices with OpenStack, you must install QEMU, ``libvirt``, and OpenStack first. We recommend using a separate physical host for your OpenStack installation. OpenStack recommends a minimum of 8GB of RAM and a quad-core processor. The following diagram depicts the OpenStack/Ceph @@ -32,8 +34,8 @@ technology stack. | OSDs | | Monitors | +------------------------+ +------------------------+ -.. important:: To use Ceph block devices with OpenStack, you must have a - running Ceph cluster. +.. important:: To use Ceph Block Devices with OpenStack, you must have + access to a running Ceph Storage Cluster. Two parts of OpenStack integrate with Ceph's block devices: @@ -48,13 +50,15 @@ Two parts of OpenStack integrate with Ceph's block devices: beginning with the Folsom release. Beginning with OpenStack Folsom and Ceph 0.52, you can use OpenStack Glance to -store images in a Ceph block device, and you can use Cinder or ``nova-volume`` +store images in a Ceph Block Device, and you can use Cinder or ``nova-volume`` to boot a VM using a copy-on-write clone of an image. The instructions below detail the setup for Glance and Nova/Cinder, although they do not have to be used together. You may store images in Ceph block devices while running VMs using a local disk, or vice versa. +.. index:: pools; OpenStack + Create a Pool =============