c2bf624c9b
This add a page of documentation on how to setup volume backends for mix and match. Change-Id: Ie784635591cae71c2cf1c4264e47af6a7443361f
1.5 KiB
Volume Federation
RBD
When using RBD (Ceph) as the driver for Cinder, volumes are stored in a Ceph pool. Access to the pool is granted through a CephX authentication key and this key is shared among all Nova compute nodes.
Please follow Ceph's documentation on setting up OpenStack with RBD.
The libvirt secret key should match the credentials for
accessing the pool in both deployments. So if you have two OpenStack
deployments and they respectively access the RBD pool through secret
keys bab2fea0-a834-48ad-8b27-6b7ce6aeab13 and
dfb36a63-484c-48b2-8a47-4de8915dacfb that map to CephX
authentications, then compute nodes in both deployments should have both
of these secret keys configured.
Note
Due to bug 1635008 it is not possible to use RBD for ephemeral storage and also for federating volumes in RBD prior to the Ocata release. This is because Nova will trust the RBD information that it uses to store ephemeral disks over the information coming from Cinder, which should be the correct information.
LVM
LVM uses an iSCSI server to share the Cinder volume with Nova compute nodes. The credentials to access each volume are randomly generated by Cinder and passed to Nova during volume attachment. No special setup needs to be done in this scenario, other than to ensure compute nodes are able to access the iSCSI server through the network.