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CLOUDSTACK-4245: Add RBD (Ceph) notes to 4.2 Release Notes

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Wido den Hollander 2013-08-29 16:09:39 +02:00
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docs/en-US/Release_Notes.xml
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@ -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>