openstack/nova
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Merge "Note the aggregate allocation ratio restriction in scheduler docs"

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Zuul 2018-12-10 10:11:39 +00:00 committed by Gerrit Code Review
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doc/source/admin/configuration/schedulers.rst
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@ -114,6 +114,8 @@ global setting. If the host is in more than one aggregate and more than one
value is found, the minimum value will be used. For information about how to value is found, the minimum value will be used. For information about how to
use this filter, see :ref:`host-aggregates`. See also :ref:`CoreFilter`. use this filter, see :ref:`host-aggregates`. See also :ref:`CoreFilter`.
Note the ``cpu_allocation_ratio`` :ref:`bug 1804125 <bug-1804125>` restriction.
AggregateDiskFilter AggregateDiskFilter
------------------- -------------------
@ -123,6 +125,9 @@ global setting. If the host is in more than one aggregate and more than one
value is found, the minimum value will be used. For information about how to value is found, the minimum value will be used. For information about how to
use this filter, see :ref:`host-aggregates`. See also :ref:`DiskFilter`. use this filter, see :ref:`host-aggregates`. See also :ref:`DiskFilter`.
Note the ``disk_allocation_ratio`` :ref:`bug 1804125 <bug-1804125>`
restriction.
AggregateImagePropertiesIsolation AggregateImagePropertiesIsolation
--------------------------------- ---------------------------------
@ -255,6 +260,8 @@ aggregate and thus more than one value is found, the minimum value will be
used. For information about how to use this filter, see used. For information about how to use this filter, see
:ref:`host-aggregates`. See also :ref:`ramfilter`. :ref:`host-aggregates`. See also :ref:`ramfilter`.
Note the ``ram_allocation_ratio`` :ref:`bug 1804125 <bug-1804125>` restriction.
AggregateTypeAffinityFilter AggregateTypeAffinityFilter
--------------------------- ---------------------------
@ -1088,6 +1095,23 @@ as well as the other filters that are typically enabled:
[filter_scheduler] [filter_scheduler]
enabled_filters=AggregateInstanceExtraSpecsFilter,RetryFilter,AvailabilityZoneFilter,ComputeCapabilitiesFilter,ImagePropertiesFilter,ServerGroupAntiAffinityFilter,ServerGroupAffinityFilter enabled_filters=AggregateInstanceExtraSpecsFilter,RetryFilter,AvailabilityZoneFilter,ComputeCapabilitiesFilter,ImagePropertiesFilter,ServerGroupAntiAffinityFilter,ServerGroupAffinityFilter
.. _bug-1804125:
.. note:: Regarding the `AggregateCoreFilter`_, `AggregateDiskFilter`_ and
`AggregateRamFilter`_, starting in 15.0.0 (Ocata) there is a behavior
change where aggregate-based overcommit ratios will no longer be honored
during scheduling for the FilterScheduler. Instead, overcommit values must
be set on a per-compute-node basis in the Nova configuration files.
If you have been relying on per-aggregate overcommit, during your upgrade,
you must change to using per-compute-node overcommit ratios in order for
your scheduling behavior to stay consistent. Otherwise, you may notice
increased NoValidHost scheduling failures as the aggregate-based overcommit
is no longer being considered.
See `bug 1804125 <https://bugs.launchpad.net/nova/+bug/1804125>`_ for more
details.
Example: Specify compute hosts with SSDs Example: Specify compute hosts with SSDs
---------------------------------------- ----------------------------------------