# Module `netapp_ontap.resources.qos_policy`

Copyright © 2021 NetApp Inc. All rights reserved.

## Quality of Service Configuration

A QoS policy defines measurable service level objectives (SLOs) that apply to the storage objects with which the policy is associated. There are two types of policies that can be configured: fixed, which defines a fixed SLO, or adaptive which defines a variable SLO for a storage object. Adaptive policies vary the SLO depending on the space usage of the storage object. A policy can be either a fixed policy or an adaptive one, not both.
Service level objectives include minimum and maximum limits on throughput in terms of IOPS. Only maximum limits can be set in terms of both IOPS and/or throughput (MB/s). A QoS policy can be used to enforce SLOs for multiple storage objects by specifying "capacity_shared" to true. For example, if a QoS policy with "capacity_shared" is set to true and it has maximum_throughput_iops set to 1000, and this policy is assigned to four volumes, then the combined throughput of all four volumes is limited to 1000 IOPS. If "capacity_shared" is set to false then, each storage object will have it's SLOs enforced individually. For example, in the previous case if the same policy was applied to four volumes but with "capacity_shared" set to false, then each of the volumes would be limited to 1000 IOPS individually. Once "capacity_shared" is set, it cannot be modified.
Adaptive parameters can specify the variable SLOs in terms of IOPS/TB. The actual IOPS enforced on the storage object can be calculated using the allocated space on the storage object. The policies are enforced individually amongst storage objects.

## Examples

### 1) Create a fixed QoS policy

The following example shows how to create a fixed QoS policy to limit throughput for a storage object between 5000 IOPS and 10000 IOPS which has capacity_shared set to false. This QoS policy can be used as a template to apply on multiple storage objects to provide individual SLOs to each object.

    from netapp_ontap import HostConnection
    from netapp_ontap.resources import QosPolicy

    with HostConnection(
        "172.21.69.245", username="admin", password="password", verify=False
    ):
        resource = QosPolicy()
        resource.fixed.capacity_shared = False
        resource.fixed.max_throughput_iops = 10000
        resource.fixed.min_throughput_iops = 5000
        resource.name = "qos_policy_5000_to_10000_iops"
        resource.svm.name = "vs0"
        resource.post(hydrate=True, return_timeout=0)
        print(resource)

### 2) Create an adaptive QoS policy

The following example shows how to create an adaptive QoS policy which provides 5000 IOPS per GB of allocated space for a storage object with a peak of 6000 IOPS. Minimum IOPS regardless of allocated space are 1000 IOPS.

    from netapp_ontap import HostConnection
    from netapp_ontap.resources import QosPolicy

    with HostConnection(
        "172.21.69.245", username="admin", password="password", verify=False
    ):
        resource = QosPolicy()
        resource.adaptive.absolute_min_iops = 1000
        resource.adaptive.expected_iops = 5000
        resource.adaptive.peak_iops = 6000
        resource.name = "adaptive_pg_5k_to_6k"
        resource.svm.name = "vs0"
        resource.post(hydrate=True, return_timeout=0)
        print(resource)

### 3) Update an existing QoS policy

The following example shows how to update SLOs of an existing QoS policy and also rename it.

    from netapp_ontap import HostConnection
    from netapp_ontap.resources import QosPolicy

    with HostConnection(
        "172.21.69.245", username="admin", password="password", verify=False
    ):
        resource = QosPolicy(uuid="d38bafc0-5a51-11e9-bd5b-005056ac6f1f")
        resource.fixed.max_throughput_iops = 15000
        resource.fixed.min_throughput_iops = 10000
        resource.name = "qos_policy_10k_to_15k_iops"
        resource.patch(hydrate=True, return_timeout=0)

### 4) Delete an existing QoS policy

When a QoS policy is deleted any associations of the policy with a storage objects are also removed.

    from netapp_ontap import HostConnection
    from netapp_ontap.resources import QosPolicy

    with HostConnection(
        "172.21.69.245", username="admin", password="password", verify=False
    ):
        resource = QosPolicy(uuid="d38bafc0-5a51-11e9-bd5b-005056ac6f1f")
        resource.delete(return_timeout=0)

## Classes

`class QosPolicy (*args, **kwargs)`

  Allows interaction with QosPolicy objects on the host

  Initialize the instance of the resource.

  Any keyword arguments are set on the instance as properties. For example, if the class was named 'MyResource', then this statement would be true:

      MyResource(name='foo').name == 'foo'

  ## Args

  `*args`
    Each positional argument represents a parent key as used in the URL of the object. That is, each value will be used to fill in a segment of the URL which refers to some parent object. The order of these arguments must match the order they are specified in the URL, from left to right.
  `**kwargs`
    each entry will have its key set as an attribute name on the instance and its value will be the value of that attribute.

  ### Ancestors

  - Resource

  ### Static methods

  `def count_collection(*args, connection: HostConnection = None, **kwargs) -> int`

    Retrieves a collection of QoS policies.

    ### Learn more

    - `DOC /storage/qos/policies`

    Fetch a count of all objects of this type from the host.

    This calls GET on the object to determine the number of records. It is more efficient than calling get_collection() because it will not construct any objects. Query parameters can be passed in as kwargs to determine a count of objects that match some filtered criteria.

    ## Args

    `*args`
      Each entry represents a parent key which is used to build the path to the child object. If the URL definition were /api/foos/{foo.name}/bars, then to get the count of bars for a particular foo, the foo.name value should be passed.
    `connection`
      The `HostConnection` object to use for this API call. If unset, tries to use the connection which is set globally for the library or from the current context.
    `**kwargs`
      Any key/value pairs passed will be sent as query parameters to the host. These query parameters can affect the count. A return_records query param will be ignored.

    ## Returns

    On success, returns an integer count of the objects of this type. On failure, returns -1.

    ## Raises

    `NetAppRestError`: If the API call returned a status code >= 400, or if there is no connection available to use either passed in or on the library.

  `def delete_collection(*args, body: typing.Union = None, connection: HostConnection = None, **kwargs) -> NetAppResponse`

    Deletes a QoS policy. All QoS workloads associated with the policy are removed.

    ### Related ONTAP commands

    - `qos policy-group delete`
    - `qos adaptive-policy-group delete`

    ### Learn more

    - `DOC /storage/qos/policies`

    Delete all objects in a collection which match the given query.

    All records on the host which match the query will be deleted.

    ## Args

    `*args`
      Each entry represents a parent key which is used to build the path to the child object. If the URL definition were /api/foos/{foo.name}/bars, then to delete the collection of bars for a particular foo, the foo.name value should be passed.
    `body`
      The body of the delete request. This could be a Resource instance or a dictionary object.
    `connection`
      The `HostConnection` object to use for this API call. If unset, tries to use the connection which is set globally for the library or from the current context.
    `**kwargs`
      Any key/value pairs passed will be sent as query parameters to the host. Only resources matching this query will be deleted.

    ## Returns

    A `NetAppResponse` object containing the details of the HTTP response.

    ## Raises

    `NetAppRestError`: If the API call returned a status code >= 400

  `def find(*args, connection: HostConnection = None, **kwargs) -> Resource`

    Retrieves a collection of QoS policies.

    ### Learn more

    - `DOC /storage/qos/policies`

    Find an instance of an object on the host given a query.

    The host will be queried with the provided key/value pairs to find a matching resource. If 0 are found, None will be returned. If more than 1 is found, an error will be raised or returned. If there is exactly 1 matching record, then it will be returned.

    ## Args

    `*args`
      Each entry represents a parent key which is used to build the path to the child object. If the URL definition were /api/foos/{foo.name}/bars, then to find a bar for a particular foo, the foo.name value should be passed.
    `connection`
      The `HostConnection` object to use for this API call. If unset, tries to use the connection which is set globally for the library or from the current context.
    `**kwargs`
      Any key/value pairs passed will be sent as query parameters to the host.

    ## Returns

    A `Resource` object containing the details of the object or None if no matches were found.

    ## Raises

    `NetAppRestError`: If the API call returned more than 1 matching resource.

  `def get_collection(*args, connection: HostConnection = None, max_records: int = None, **kwargs) -> typing.Iterable`

    Retrieves a collection of QoS policies.

    ### Learn more

    - `DOC /storage/qos/policies`

    Fetch a list of all objects of this type from the host.

    This is a lazy fetch, making API calls only as necessary when the result of this call is iterated over. For instance, if max_records is set to 5, then iterating over the collection causes an API call to be sent to the server once for every 5 records. If the client stops iterating before getting to the 6th record, then no additional API calls are made.

    ## Args

    `*args`
      Each entry represents a parent key which is used to build the path to the child object. If the URL definition were /api/foos/{foo.name}/bars, then to get the collection of bars for a particular foo, the foo.name value should be passed.
    `connection`
      The `HostConnection` object to use for this API call. If unset, tries to use the connection which is set globally for the library or from the current context.
    `max_records`
      The maximum number of records to return per call
    `**kwargs`
      Any key/value pairs passed will be sent as query parameters to the host.

    ## Returns

    A list of `Resource` objects

    ## Raises

    `NetAppRestError`: If there is no connection available to use either passed in or on the library. This would be not be raised when get_collection() is called, but rather when the result is iterated.

  `def patch_collection(body: dict, *args, connection: HostConnection = None, **kwargs) -> NetAppResponse`

    Update a specific QoS policy.

    ### Related ONTAP commands

    - `qos policy-group modify`
    - `qos adaptive-policy-group modify`

    ### Learn more

    - `DOC /storage/qos/policies`

    Patch all objects in a collection which match the given query.

    All records on the host which match the query will be patched with the provided body.

    ## Args

    `body`
      A dictionary of name/value pairs to set on all matching members of the collection.
    `*args`
      Each entry represents a parent key which is used to build the path to the child object. If the URL definition were /api/foos/{foo.name}/bars, then to patch the collection of bars for a particular foo, the foo.name value should be passed.
    `connection`
      The `HostConnection` object to use for this API call. If unset, tries to use the connection which is set globally for the library or from the current context.
    `**kwargs`
      Any key/value pairs passed will be sent as query parameters to the host. Only resources matching this query will be patched.

    ## Returns

    A `NetAppResponse` object containing the details of the HTTP response.

    ## Raises

    `NetAppRestError`: If the API call returned a status code >= 400

  ### Methods

  `def delete(self, body: typing.Union = None, poll: bool = True, poll_interval: typing.Union = None, poll_timeout: typing.Union = None, **kwargs) -> NetAppResponse`

    Deletes a QoS policy. All QoS workloads associated with the policy are removed.

    ### Related ONTAP commands

    - `qos policy-group delete`
    - `qos adaptive-policy-group delete`

    ### Learn more

    - `DOC /storage/qos/policies`

    Send a deletion request to the host for this object.

    ## Args

    `body`
      The body of the delete request. This could be a Resource instance or a dictionary object.
    `poll`
      If set to True, the call will not return until the asynchronous job on the host has completed. Has no effect if the host did not return a job response.
    `poll_interval`
      If the operation returns a job, this specifies how often to query the job for updates.
    `poll_timeout`
      If the operation returns a job, this specifies how long to continue monitoring the job's status for completion.
    `**kwargs`
      Any key/value pairs passed will be sent as query parameters to the host.

    ## Returns

    A `NetAppResponse` object containing the details of the HTTP response.

    ## Raises

    `NetAppRestError`: If the API call returned a status code >= 400

  `def get(self, **kwargs) -> NetAppResponse`

    Retrieves a specific QoS policy.

    ### Related ONTAP commands

    - `qos policy-group show`
    - `qos adaptive-policy-group show`

    ### Learn more

    - `DOC /storage/qos/policies`

    Fetch the details of the object from the host.

    Requires the keys to be set (if any). After returning, new or changed properties from the host will be set on the instance.

    ## Returns

    A `NetAppResponse` object containing the details of the HTTP response.

    ## Raises

    `NetAppRestError`: If the API call returned a status code >= 400

  `def patch(self, hydrate: bool = False, poll: bool = True, poll_interval: typing.Union = None, poll_timeout: typing.Union = None, **kwargs) -> NetAppResponse`

    Update a specific QoS policy.

    ### Related ONTAP commands

    - `qos policy-group modify`
    - `qos adaptive-policy-group modify`

    ### Learn more

    - `DOC /storage/qos/policies`

    Send the difference in the object's state to the host as a modification request.

    Calculates the difference in the object's state since the last time we interacted with the host and sends this in the request body.

    ## Args

    `hydrate`
      If set to True, after the response is received from the call, a a GET call will be made to refresh all fields of the object.
    `poll`
      If set to True, the call will not return until the asynchronous job on the host has completed. Has no effect if the host did not return a job response.
    `poll_interval`
      If the operation returns a job, this specifies how often to query the job for updates.
    `poll_timeout`
      If the operation returns a job, this specifies how long to continue monitoring the job's status for completion.
    `**kwargs`
      Any key/value pairs passed will normally be sent as query parameters to the host. If any of these pairs are parameters that are sent as formdata then only parameters of that type will be accepted and all others will be discarded.

    ## Returns

    A `NetAppResponse` object containing the details of the HTTP response.

    ## Raises

    `NetAppRestError`: If the API call returned a status code >= 400

  `def post(self, hydrate: bool = False, poll: bool = True, poll_interval: typing.Union = None, poll_timeout: typing.Union = None, **kwargs) -> NetAppResponse`

    Creates a QoS policy.

    ### Required properties

    - `svm.uuid` or `svm.name` - The existing SVM owning the QoS policy.
    - `name` - The name of the QoS policy.
    - `fixed.*` or `adaptive.*` - Either of the fixed or adaptive parameters.

    ### Default property values

    - If `fixed.*` parameters are specified, then capacity.shared is set to false by default.

    ### Related ONTAP commands

    - `qos policy-group create`
    - `qos adaptive-policy-group create`

    ### Learn more

    - `DOC /storage/qos/policies`

    Send this object to the host as a creation request.

    ## Args

    `hydrate`
      If set to True, after the response is received from the call, a a GET call will be made to refresh all fields of the object.
    `poll`
      If set to True, the call will not return until the asynchronous job on the host has completed. Has no effect if the host did not return a job response.
    `poll_interval`
      If the operation returns a job, this specifies how often to query the job for updates.
    `poll_timeout`
      If the operation returns a job, this specifies how long to continue monitoring the job's status for completion.
    `**kwargs`
      Any key/value pairs passed will normally be sent as query parameters to the host. If any of these pairs are parameters that are sent as formdata then only parameters of that type will be accepted and all others will be discarded.

    ## Returns

    A `NetAppResponse` object containing the details of the HTTP response.

    ## Raises

    `NetAppRestError`: If the API call returned a status code >= 400

  ### Inherited members

  - `Resource`:
    - `from_dict`
    - `get_collection_url`
    - `get_connection`
    - `instance_location`
    - `path_keys`
    - `poll`
    - `set_connection`
    - `to_dict`
`class QosPolicySchema (*, only: typing.Union = None, exclude: typing.Union = (), many: bool = False, context: typing.Dict = None, load_only: typing.Union = (), dump_only: typing.Union = (), partial: typing.Union = False, unknown: str = None)`

  The fields of the QosPolicy object

  ### Ancestors

  - netapp_ontap.resource.ResourceSchema
  - marshmallow.schema.Schema
  - marshmallow.base.SchemaABC

  ### Class variables

  `adaptive GET POST PATCH`

    The adaptive field of the qos_policy.

  `fixed GET POST PATCH`

    The fixed field of the qos_policy.

  `links GET`

    The links field of the qos_policy.

  `name GET POST PATCH`

    Name of the QoS policy.

    Example: extreme

  `object_count GET`

    Number of objects attached to this policy.

  `svm GET POST PATCH`

    The svm field of the qos_policy.

  `uuid GET`

    The uuid field of the qos_policy.

    Example: 1cd8a442-86d1-11e0-ae1c-123478563412