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F OpenNebula/one#3244: TM mix mode #716

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Aug 7, 2019
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F OpenNebula/one#3244: TM mix mode #716

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F OpenNebula/one#3244: TM mix mode
xorel Aug 4, 2019
2c05d72
Update sd.rst
Aug 7, 2019
f407497
Update sd.rst
Aug 7, 2019
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2 changes: 2 additions & 0 deletions source/deployment/open_cloud_storage_setup/ceph_ds.rst
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Expand Up @@ -33,6 +33,8 @@ For example, consider a system using an Image and System Datastore backed by a C

.. note:: In this case context disk and auxiliar files (deployment description and checkpoints) are stored locally in the nodes.

.. _ceph-ssh-mode:

SSH Mode
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In this mode, the associated rbd file for each disk is exported to a file and stored in the local file system of the hypervisor.
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2 changes: 2 additions & 0 deletions source/deployment/open_cloud_storage_setup/fs_ds.rst
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Expand Up @@ -198,6 +198,8 @@ Additional Configuration
The qcow2 drivers are a specialization of the shared drivers to work with the qcow2 format for disk images. Images are created and through the ``qemu-img`` command using the original image as backing file. Custom options can be sent to ``qemu-img`` clone action through the variable ``QCOW2_OPTIONS`` in ``/var/lib/one/remotes/tm/tmrc``.
* ``DD_BLOCK_SIZE``: Block size for `dd` operations (default: 64kB) could be set in ``/var/lib/one/remotes/etc/datastore/fs/fs.conf``.

.. _shared-ssh-mode:

Combining the shared & SSH Transfer Modes
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15 changes: 15 additions & 0 deletions source/integration/infrastructure_integration/sd.rst
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Expand Up @@ -297,6 +297,21 @@ The monitor_ds.sh probe from the IM, if the ``.monitor`` file is present (e.g. `

The script is responsible from getting the information from all disks of all VMs in the datastore in that node.

.. _mixed-tm-modes:

Mixed Transfere modes
================================================================================

Certain types of TM can be used in so called *mixed mode* and allow different types of image and system datastore drivers to work together.

The following combinations are supported by default:

- **CEPH** + **SSH** described in :ref:`Ceph SSH mode <ceph-ssh-mode>`
- **Qcow2/shared** + **SSH** described in :ref:`Qcow2/shared SSH mode <shared-ssh-mode>`

The support in oned is generic, in a *mixed mode* every TM action (such as ``clone`` or ``delete``) is suffixed with the driver name of the system DS in use. For example, an action like ``clone.ssh`` is actually invoked in CEPH + SSH mode. The driver first tries to find the complete action script, including the system DS suffix (e.g. ``ceph/clone.ssh``) and only if that does not exist fallbacks to the default (``ceph/clone``).

In this way other combinations can be easily added.

An Example VM
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