CLOUDSTACK-4245: Add RBD (Ceph) notes to 4.2 Release Notes
Project: http://git-wip-us.apache.org/repos/asf/cloudstack/repo Commit: http://git-wip-us.apache.org/repos/asf/cloudstack/commit/dcf5b335 Tree: http://git-wip-us.apache.org/repos/asf/cloudstack/tree/dcf5b335 Diff: http://git-wip-us.apache.org/repos/asf/cloudstack/diff/dcf5b335 Branch: refs/heads/ldapplugin Commit: dcf5b335c62ee7253c047d20fcbeb81948a59646 Parents: 4c234c0 Author: Wido den Hollander <[email protected]> Authored: Thu Aug 29 16:09:39 2013 +0200 Committer: Wido den Hollander <[email protected]> Committed: Thu Aug 29 16:18:46 2013 +0200 ---------------------------------------------------------------------- docs/en-US/Release_Notes.xml | 22 ++++++++++++++++++++++ 1 file changed, 22 insertions(+) ---------------------------------------------------------------------- http://git-wip-us.apache.org/repos/asf/cloudstack/blob/dcf5b335/docs/en-US/Release_Notes.xml ---------------------------------------------------------------------- diff --git a/docs/en-US/Release_Notes.xml b/docs/en-US/Release_Notes.xml index 2f32a56..ae83455 100644 --- a/docs/en-US/Release_Notes.xml +++ b/docs/en-US/Release_Notes.xml @@ -221,6 +221,28 @@ under the License. check policies in the cloud. You can override this value for an individual health check policy.</para> </section> + <section id="rbd-primary-storage"> + <title>Snaphotting, backups, cloning and System VMs for RBD Primary Storage</title> + <note> + <para>These new RBD features require at least librbd 0.61.7 (Cuttlefish) and libvirt 0.9.14 + on the KVM hypervisors.</para> + </note> + <para>With this release &PRODUCT; will leverage the features of RBD format 2. This allows + snapshotting and backing up those snapshots.</para> + <para>Backups of snapshots to Secondary Storage are full copies of the RBD snapshot, + they are not RBD diffs. This because when restoring a backup of a snapshot it is not mandatory + that this backup is deployed on RBD again, it could also be a NFS Primary Storage.</para> + <para>Another key feature of RBD format 2 is cloning and with this release templates will + be copied to Primary Storage once and using the cloning mechanism new disks will be cloned + from this parent template. This saves space and decreases deployment time for Instances + dramatically.</para> + <para>Before this release a NFS Primary Storage was still required for running the System VMs + from. The reason behind this was a so called 'patch disk' which was generated by the hypervisor + which contained metadata for the System VM. The scripts generating this disk didn't support + RBD and thus System VMs had to be deployed from NFS. With 4.2 instead of the patch disk a + VirtIO serial console is used to pass meta information to System VMs. This enabled the deployment + of System VMs on RBD Primary Storage.</para> + </section> </section> <section id="issues-fixed-4.2"> <title>Issues Fixed in 4.2.0</title>
