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Posted to commits@cloudstack.apache.org by wi...@apache.org on 2013/08/29 16:22:30 UTC
[2/5] git commit: updated refs/heads/master to a19eb5b
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/master
Commit: dcf5b335c62ee7253c047d20fcbeb81948a59646
Parents: 4c234c0
Author: Wido den Hollander <wi...@widodh.nl>
Authored: Thu Aug 29 16:09:39 2013 +0200
Committer: Wido den Hollander <wi...@widodh.nl>
Committed: Thu Aug 29 16:18:46 2013 +0200
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docs/en-US/Release_Notes.xml | 22 ++++++++++++++++++++++
1 file changed, 22 insertions(+)
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http://git-wip-us.apache.org/repos/asf/cloudstack/blob/dcf5b335/docs/en-US/Release_Notes.xml
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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>