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Retrieve NVMe subsystem hosts

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GET /protocols/nvme/subsystems/{subsystem.uuid}/hosts

Introduced In: 9.6

Retrieves the NVMe subsystem hosts of an NVMe subsystem.

Expensive properties

There is an added computational cost to retrieving values for these properties. They are not included by default in GET results and must be explicitly requested using the fields query parameter. See Requesting specific fields to learn more.

  • subsystem_maps.*

  • vserver nvme subsystem map show

  • vserver nvme subsystem show

Learn more

Parameters

Name Type In Required Description

subsystem.uuid

string

path

True

The unique identifier of the NVMe subsystem.

fields

array[string]

query

False

Specify the fields to return.

max_records

integer

query

False

Limit the number of records returned.

return_records

boolean

query

False

The default is true for GET calls. When set to false, only the number of records is returned.

  • Default value: 1

return_timeout

integer

query

False

The number of seconds to allow the call to execute before returning. When iterating over a collection, the default is 15 seconds. ONTAP returns earlier if either max records or the end of the collection is reached.

  • Default value: 1

  • Max value: 120

  • Min value: 0

order_by

array[string]

query

False

Order results by specified fields and optional [asc

Response

Status: 200, Ok
Name Type Description

_links

_links

num_records

integer

The number of records in the response.

records

array[nvme_subsystem_host]
Example response 
{
  "_links": {
    "next": {
      "href": "/api/resourcelink"
    },
    "self": {
      "href": "/api/resourcelink"
    }
  },
  "num_records": 1,
  "records": [
    {
      "_links": {
        "self": {
          "href": "/api/resourcelink"
        }
      },
      "dh_hmac_chap": {
        "controller_secret_key": "DHHC-1:00:ia6zGodOr4SEG0Zzaw398rpY0wqipUWj4jWjUh4HWUz6aQ2n:",
        "group_size": "string",
        "hash_function": "string",
        "host_secret_key": "DHHC-1:00:ia6zGodOr4SEG0Zzaw398rpY0wqipUWj4jWjUh4HWUz6aQ2n:",
        "mode": "bidirectional"
      },
      "io_queue": {
        "count": 4,
        "depth": 32
      },
      "nqn": "nqn.1992-01.example.com:string",
      "priority": "string",
      "records": [
        {
          "_links": {
            "self": {
              "href": "/api/resourcelink"
            }
          },
          "dh_hmac_chap": {
            "controller_secret_key": "DHHC-1:00:ia6zGodOr4SEG0Zzaw398rpY0wqipUWj4jWjUh4HWUz6aQ2n:",
            "group_size": "string",
            "hash_function": "string",
            "host_secret_key": "DHHC-1:00:ia6zGodOr4SEG0Zzaw398rpY0wqipUWj4jWjUh4HWUz6aQ2n:",
            "mode": "bidirectional"
          },
          "io_queue": {
            "count": 4,
            "depth": 32
          },
          "nqn": "nqn.1992-01.example.com:string",
          "subsystem": {
            "_links": {
              "self": {
                "href": "/api/resourcelink"
              }
            },
            "name": "subsystem1",
            "uuid": "1cd8a442-86d1-11e0-ae1c-123478563412"
          }
        }
      ],
      "subsystem": {
        "_links": {
          "self": {
            "href": "/api/resourcelink"
          }
        },
        "name": "subsystem1",
        "uuid": "1cd8a442-86d1-11e0-ae1c-123478563412"
      }
    }
  ]
}

Error

Status: Default

ONTAP Error Response Codes

Error Code Description

72090001

The NVMe subsystem does not exist.

Also see the table of common errors in the Response body overview section of this documentation.

Name Type Description

error

returned_error
Example error 
{
  "error": {
    "arguments": [
      {
        "code": "string",
        "message": "string"
      }
    ],
    "code": "4",
    "message": "entry doesn't exist",
    "target": "uuid"
  }
}

Definitions

See Definitions

href

Name Type Description

href

string

_links

Name Type Description

next

href

self

href

_links

Name Type Description

self

href

dh_hmac_chap

A container for properties of NVMe in-band authentication with the DH-HMAC-CHAP protocol.

Name Type Description

controller_secret_key

string

The controller secret for NVMe in-band authentication. The value of this property is used by the NVMe host to authenticate the NVMe controller while establishing a connection. If unset, the controller is not authenticated. When supplied, the property host_secret_key must also be supplied. Optional in POST.

This property is write-only. The mode property can be used to identify if a controller secret has been set for the host, but the controller secret value cannot be read. To change the value, the host must be deleted from the subsystem and re-added.

group_size

string

The Diffie-Hellman group size for NVMe in-band authentication. When property host_secret_key is provided, this property defaults to 2048_bit. When supplied, the property host_secret_key must also be supplied. Optional in POST.

hash_function

string

The hash function for NVMe in-band authentication. When property host_secret_key is provided, this property defaults to sha_256. When supplied, the property host_secret_key must also be supplied. Optional in POST.

host_secret_key

string

The host secret for NVMe in-band authentication. The value of this property is used by the NVMe controller to authenticate the NVMe host while establishing a connection. If unset, no authentication is performed by the host or controller. This property must be supplied if any other NVMe in-band authentication properties are supplied. Optional in POST.

This property is write-only. The mode property can be used to identify if a host secret has been set for the host, but the host secret value cannot be read. To change the value, the host must be deleted from the subsystem and re-added.

mode

string

The expected NVMe in-band authentication mode for the host. This property is an indication of which secrets are configured for the host. When set to:

  • none: The host has neither the host nor controller secret configured, and no authentication is performed.

  • unidirectional: The host has a host secret configured. The controller will authenticate the host.

  • bidirectional: The host has both a host and controller secret configured. The controller will authenticate the host and the host will authenticate the controller.

io_queue

The properties of the submission queue used to submit I/O commands for execution by the NVMe controller.

Name Type Description

count

integer

The number of I/O queue pairs. Absence of this property in GET implies property priority is set and platform and transport protocol specific values for I/O queue count is being used. Valid in GET only.

depth

integer

The I/O queue depth. Absence of this property in GET implies property priority is set and platform and transport protocol specific values for I/O queue depth is being used. Valid in GET only.

io_queue

The properties of the submission queue used to submit I/O commands for execution by the NVMe controller.

Name Type Description

count

integer

The number of I/O queue pairs. The default value is inherited from the owning NVMe subsystem.

depth

integer

The I/O queue depth. The default value is inherited from the owning NVMe subsystem.

subsystem

The NVMe subsystem to which the NVMe host has been provisioned.

Name Type Description

_links

_links

name

string

The name of the NVMe subsystem.

uuid

string

The unique identifier of the NVMe subsystem.

records

The NVMe host provisioned to access NVMe namespaces mapped to a subsystem.

Name Type Description

_links

_links

dh_hmac_chap

dh_hmac_chap

A container for properties of NVMe in-band authentication with the DH-HMAC-CHAP protocol.

io_queue

io_queue

The properties of the submission queue used to submit I/O commands for execution by the NVMe controller.

nqn

string

The NVMe qualified name (NQN) used to identify the NVMe storage target. Not allowed in POST when the records property is used.

subsystem

subsystem

The NVMe subsystem to which the NVMe host has been provisioned.

nvme_subsystem_host

The NVMe host provisioned to access NVMe namespaces mapped to a subsystem.

Name Type Description

_links

_links

dh_hmac_chap

dh_hmac_chap

A container for properties of NVMe in-band authentication with the DH-HMAC-CHAP protocol.

io_queue

io_queue

The properties of the submission queue used to submit I/O commands for execution by the NVMe controller.

nqn

string

The NVMe qualified name (NQN) used to identify the NVMe storage target. Not allowed in POST when the records property is used.

priority

string

The host priority setting allocates appropriate NVMe I/O queues (count and depth) for the host to submit I/O commands. Absence of this property in GET implies io_queue count and I/O queue depth are being used.

records

array[records]

An array of NVMe hosts specified to add multiple NVMe hosts to an NVMe subsystem in a single API call. Valid in POST only.

subsystem

subsystem

The NVMe subsystem to which the NVMe host has been provisioned.

error_arguments

Name Type Description

code

string

Argument code

message

string

Message argument

returned_error

Name Type Description

arguments

array[error_arguments]

Message arguments

code

string

Error code

message

string

Error message

target

string

The target parameter that caused the error.