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From wid...@apache.org
Subject [4/5] git commit: updated refs/heads/4.2 to 178f405
Date Thu, 29 Aug 2013 14:22:32 GMT
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/d09a6398
Tree: http://git-wip-us.apache.org/repos/asf/cloudstack/tree/d09a6398
Diff: http://git-wip-us.apache.org/repos/asf/cloudstack/diff/d09a6398

Branch: refs/heads/4.2
Commit: d09a639805dfa0fef7f23039b4a0f4719288ae9c
Parents: f07cdd5
Author: Wido den Hollander <wido@widodh.nl>
Authored: Thu Aug 29 16:09:39 2013 +0200
Committer: Wido den Hollander <wido@widodh.nl>
Committed: Thu Aug 29 16:22:03 2013 +0200

----------------------------------------------------------------------
 docs/en-US/Release_Notes.xml | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)
----------------------------------------------------------------------


http://git-wip-us.apache.org/repos/asf/cloudstack/blob/d09a6398/docs/en-US/Release_Notes.xml
----------------------------------------------------------------------
diff --git a/docs/en-US/Release_Notes.xml b/docs/en-US/Release_Notes.xml
index 297ebf4..ad81d02 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>


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