58 lines
1.9 KiB
ReStructuredText
58 lines
1.9 KiB
ReStructuredText
PowerVM
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=======
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Introduction
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------------
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OpenStack Compute supports the PowerVM hypervisor through `NovaLink`_. In the
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NovaLink architecture, a thin NovaLink virtual machine running on the Power
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system manages virtualization for that system. The ``nova-compute`` service
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can be installed on the NovaLink virtual machine and configured to use the
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PowerVM compute driver. No external management element (e.g. Hardware
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Management Console) is needed.
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.. _NovaLink: https://www.ibm.com/support/knowledgecenter/en/POWER8/p8eig/p8eig_kickoff.htm
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Configuration
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-------------
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In order to function properly, the ``nova-compute`` service must be executed
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by a member of the ``pvm_admin`` group. Use the ``usermod`` command to add the
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user. For example, to add the ``stacker`` user to the ``pvm_admin`` group, execute::
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sudo usermod -a -G pvm_admin stacker
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The user must re-login for the change to take effect.
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To enable the PowerVM compute driver, set the following configuration option
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in the ``/etc/nova/nova.conf`` file:
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.. code-block:: ini
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[Default]
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compute_driver = powervm.PowerVMDriver
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The PowerVM driver supports two types of storage for ephemeral disks:
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``localdisk`` or ``ssp``. If ``localdisk`` is selected, you must specify which
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volume group should be used. E.g.:
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.. code-block:: ini
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[powervm]
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disk_driver = localdisk
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volume_group_name = openstackvg
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.. note::
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Using the ``rootvg`` volume group is strongly discouraged since ``rootvg``
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is used by the management partition and filling this will cause failures.
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The PowerVM driver also supports configuring the default amount of physical
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processor compute power (known as "proc units") which will be given to each
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vCPU. This value will be used if the requested flavor does not specify the
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``powervm:proc_units`` extra-spec. A factor value of 1.0 means a whole physical
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processor, whereas 0.05 means 1/20th of a physical processor. E.g.:
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.. code-block:: ini
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[powervm]
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proc_units_factor = 0.1
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