openstack-manuals/doc/common/tables/nova-scheduling.xml

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        <para xmlns="http://docbook.org/ns/docbook" version="5.0">
        <table rules="all">
          <caption>Description of configuration options for scheduling</caption>
           <col width="50%"/>
           <col width="50%"/>
           <thead>
              <tr>
                  <td>Configuration option=Default value</td>
                  <td>Description</td>
              </tr>
          </thead>
          <tbody>
              <tr>
                       <td>cpu_allocation_ratio=16.0</td>
                       <td>(FloatOpt) Virtual CPU to physical CPU allocation ratio which affects all CPU filters. This configuration specifies a global ratio for CoreFilter. For AggregateCoreFilter, it will fall back to this configuration value if no per-aggregate setting found.</td>
              </tr>
              <tr>
                       <td>disk_allocation_ratio=1.0</td>
                       <td>(FloatOpt) virtual disk to physical disk allocation ratio</td>
              </tr>
              <tr>
                       <td>isolated_hosts=</td>
                       <td>(ListOpt) Host reserved for specific images</td>
              </tr>
              <tr>
                       <td>isolated_images=</td>
                       <td>(ListOpt) Images to run on isolated host</td>
              </tr>
              <tr>
                       <td>max_instances_per_host=50</td>
                       <td>(IntOpt) Ignore hosts that have too many instances</td>
              </tr>
              <tr>
                       <td>max_io_ops_per_host=8</td>
                       <td>(IntOpt) Ignore hosts that have too many builds/resizes/snaps/migrations</td>
              </tr>
              <tr>
                       <td>ram_allocation_ratio=1.5</td>
                       <td>(FloatOpt) Virtual ram to physical ram allocation ratio which affects all ram filters. This configuration specifies a global ratio for RamFilter. For AggregateRamFilter, it will fall back to this configuration value if no per-aggregate setting found.</td>
              </tr>
              <tr>
                       <td>ram_weight_multiplier=10.0</td>
                       <td>(FloatOpt) Multiplier used for weighing ram.  Negative numbers mean to stack vs spread.</td>
              </tr>
              <tr>
                       <td>ram_weight_multiplier=1.0</td>
                       <td>(FloatOpt) Multiplier used for weighing ram.  Negative numbers mean to stack vs spread.</td>
              </tr>
              <tr>
                       <td>reserved_host_disk_mb=0</td>
                       <td>(IntOpt) Amount of disk in MB to reserve for the host</td>
              </tr>
              <tr>
                       <td>reserved_host_memory_mb=512</td>
                       <td>(IntOpt) Amount of memory in MB to reserve for the host</td>
              </tr>
              <tr>
                       <td>restrict_isolated_hosts_to_isolated_images=True</td>
                       <td>(BoolOpt) Whether to force isolated hosts to run only isolated images</td>
              </tr>
              <tr>
                       <td>scheduler_available_filters=['nova.scheduler.filters.all_filters']</td>
                       <td>(MultiStrOpt) Filter classes available to the scheduler which may be specified more than once.  An entry of "nova.scheduler.filters.standard_filters" maps to all filters included with nova.</td>
              </tr>
              <tr>
                       <td>scheduler_default_filters=RetryFilter,AvailabilityZoneFilter,RamFilter,ComputeFilter,ComputeCapabilitiesFilter,ImagePropertiesFilter</td>
                       <td>(ListOpt) Which filter class names to use for filtering hosts when not specified in the request.</td>
              </tr>
              <tr>
                       <td>scheduler_driver=nova.scheduler.filter_scheduler.FilterScheduler</td>
                       <td>(StrOpt) Default driver to use for the scheduler</td>
              </tr>
              <tr>
                       <td>scheduler_filter_classes=nova.cells.filters.all_filters</td>
                       <td>(ListOpt) Filter classes the cells scheduler should use.  An entry of "nova.cells.filters.all_filters"maps to all cells filters included with nova.</td>
              </tr>
              <tr>
                       <td>scheduler_host_manager=nova.scheduler.host_manager.HostManager</td>
                       <td>(StrOpt) The scheduler host manager class to use</td>
              </tr>
              <tr>
                       <td>scheduler_host_subset_size=1</td>
                       <td>(IntOpt) New instances will be scheduled on a host chosen randomly from a subset of the N best hosts. This property defines the subset size that a host is chosen from. A value of 1 chooses the first host returned by the weighing functions. This value must be at least 1. Any value less than 1 will be ignored, and 1 will be used instead</td>
              </tr>
              <tr>
                       <td>scheduler_json_config_location=</td>
                       <td>(StrOpt) Absolute path to scheduler configuration JSON file.</td>
              </tr>
              <tr>
                       <td>scheduler_manager=nova.scheduler.manager.SchedulerManager</td>
                       <td>(StrOpt) full class name for the Manager for scheduler</td>
              </tr>
              <tr>
                       <td>scheduler_max_attempts=3</td>
                       <td>(IntOpt) Maximum number of attempts to schedule an instance</td>
              </tr>
              <tr>
                       <td>scheduler_retries=10</td>
                       <td>(IntOpt) How many retries when no cells are available.</td>
              </tr>
              <tr>
                       <td>scheduler_retry_delay=2</td>
                       <td>(IntOpt) How often to retry in seconds when no cells are available.</td>
              </tr>
              <tr>
                       <td>scheduler_topic=scheduler</td>
                       <td>(StrOpt) the topic scheduler nodes listen on</td>
              </tr>
              <tr>
                       <td>scheduler_weight_classes=nova.cells.weights.all_weighers</td>
                       <td>(ListOpt) Weigher classes the cells scheduler should use.  An entry of "nova.cells.weights.all_weighers"maps to all cell weighers included with nova.</td>
              </tr>
              <tr>
                       <td>scheduler_weight_classes=nova.scheduler.weights.all_weighers</td>
                       <td>(ListOpt) Which weight class names to use for weighing hosts</td>
              </tr>
       </tbody>
        </table>
        </para>