cinder.scheduler.host_manager module¶
Manage backends in the current zone.
- class BackendState(host, cluster_name, capabilities=None, service=None)¶
Bases:
object
Mutable and immutable information tracked for a volume backend.
- property backend_id¶
- consume_from_volume(volume, update_time=True)¶
Incrementally update host state from a volume.
- update_backend(capability)¶
- update_capabilities(capabilities=None, service=None)¶
- update_from_volume_capability(capability, service=None)¶
Update information about a host from its volume_node info.
‘capability’ is the status info reported by volume backend, a typical capability looks like this:
{ capability = { 'volume_backend_name': 'Local iSCSI', # 'vendor_name': 'OpenStack', # backend level 'driver_version': '1.0', # mandatory/fixed 'storage_protocol': 'iSCSI', # stats&capabilities 'active_volumes': 10, # 'IOPS_provisioned': 30000, # optional custom 'fancy_capability_1': 'eat', # stats & capabilities 'fancy_capability_2': 'drink', # 'pools': [ {'pool_name': '1st pool', # 'total_capacity_gb': 500, # mandatory stats for 'free_capacity_gb': 230, # pools 'allocated_capacity_gb': 270, # 'QoS_support': 'False', # 'reserved_percentage': 0, # 'dying_disks': 100, # 'super_hero_1': 'spider-man', # optional custom 'super_hero_2': 'flash', # stats & capabilities 'super_hero_3': 'neoncat' # }, {'pool_name': '2nd pool', 'total_capacity_gb': 1024, 'free_capacity_gb': 1024, 'allocated_capacity_gb': 0, 'QoS_support': 'False', 'reserved_percentage': 0, 'dying_disks': 200, 'super_hero_1': 'superman', 'super_hero_2': ' ', 'super_hero_2': 'Hulk' } ] } }
- update_pools(capability, service)¶
Update storage pools information from backend reported info.
- class HostManager¶
Bases:
object
Base HostManager class.
- ALLOWED_SERVICE_NAMES = ('volume', 'backup')¶
- REQUIRED_KEYS = frozenset({'allocated_capacity_gb', 'free_capacity_gb', 'max_over_subscription_ratio', 'pool_name', 'provisioned_capacity_gb', 'reserved_percentage', 'thick_provisioning_support', 'thin_provisioning_support', 'total_capacity_gb'})¶
- backend_state_cls¶
- first_receive_capabilities()¶
- get_all_backend_states(context)¶
Returns a dict of all the backends the HostManager knows about.
Each of the consumable resources in BackendState are populated with capabilities scheduler received from RPC.
- For example:
{‘192.168.1.100’: BackendState(), …}
- get_backup_host(volume, driver=None)¶
- get_filtered_backends(backends, filter_properties, filter_class_names=None)¶
Filter backends and return only ones passing all filters.
- get_pools(context, filters=None)¶
Returns a dict of all pools on all hosts HostManager knows about.
- get_usage_and_notify(capa_new, updated_pools, host, timestamp)¶
- get_weighed_backends(backends, weight_properties, weigher_class_names=None)¶
Weigh the backends.
- has_all_capabilities()¶
- notify_service_capabilities(service_name, backend, capabilities, timestamp)¶
Notify the ceilometer with updated volume stats
- revert_volume_consumed_capacity(pool_name, size)¶
- update_service_capabilities(service_name, host, capabilities, cluster_name, timestamp)¶
Update the per-service capabilities based on this notification.
- class PoolState(host, cluster_name, capabilities, pool_name)¶
Bases:
cinder.scheduler.host_manager.BackendState
- update_from_volume_capability(capability, service=None)¶
Update information about a pool from its volume_node info.
- update_pools(capability)¶
Update storage pools information from backend reported info.
- class ReadOnlyDict(source=None)¶
Bases:
collections.abc.Mapping
A read-only dict.