# JSON-RPC Methods {#jsonrpc}

# Overview {#jsonrpc_overview}

SPDK implements a [JSON-RPC 2.0](http://www.jsonrpc.org/specification) server
to allow external management tools to dynamically configure SPDK components.

## Parameters

Most of the commands can take parameters. If present, parameter is validated against its domain. If this check fail
whole command will fail with response error message [Invalid params](@ref jsonrpc_error_message).

### Required parameters

These parameters are mandatory. If any required parameter is missing RPC command will fail with proper error response.

### Optional parameters

Those parameters might be omitted. If an optional parameter is present it must be valid otherwise command will fail
proper error response.

## Error response message {#jsonrpc_error_message}

Each error response will contain proper message. As much as possible the message should indicate what went wrong during
command processing.

There is ongoing effort to customize this messages but some RPC methods just return "Invalid parameters" as message body
for any kind of error.

Code   | Description
------ | -----------
-1     | Invalid state - given method exists but it is not callable in [current runtime state](@ref rpc_start_subsystem_init)
-32600 | Invalid request - not compliant with JSON-RPC 2.0 Specification
-32601 | Method not found
-32602 | @ref jsonrpc_invalid_params
-32603 | Internal error for e.g.: errors like out of memory
-32700 | @ref jsonrpc_parser_error

### Parser error {#jsonrpc_parser_error}

Encountered some error during parsing request like:

- the JSON object is malformed
- parameter is too long
- request is too long

### Invalid params {#jsonrpc_invalid_params}

This type of error is most common one. It mean that there is an error while processing the request like:

- Parameters decoding in RPC method handler failed because required parameter is missing.
- Unknown parameter present encountered.
- Parameter type doesn't match expected type e.g.: given number when expected a string.
- Parameter domain check failed.
- Request is valid but some other error occurred during processing request. If possible message explains the error reason nature.

# App Framework {#jsonrpc_components_app}

## kill_instance {#rpc_kill_instance}

Send a signal to the application.

### Parameters

Name                    | Optional | Type        | Description
----------------------- | -------- | ----------- | -----------
sig_name                | Required | string      | Signal to send (SIGINT, SIGTERM, SIGQUIT, SIGHUP, or SIGKILL)

### Example

Example request:
~~~
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "kill_instance",
  "params": {
    "sig_name": "SIGINT"
  }
}
~~~

Example response:
~~~
{
  "jsonrpc": "2.0",
  "id": 1,
  "result": true
}
~~~

## context_switch_monitor {#rpc_context_switch_monitor}

Query, enable, or disable the context switch monitoring functionality.

### Parameters

Name                    | Optional | Type        | Description
----------------------- | -------- | ----------- | -----------
enabled                 | Optional | boolean     | Enable (`true`) or disable (`false`) monitoring (omit this parameter to query the current state)

### Response

Name                    | Type        | Description
----------------------- | ----------- | -----------
enabled                 | boolean     | The current state of context switch monitoring

### Example

Example request:
~~~
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "context_switch_monitor",
  "params": {
    "enabled": false
  }
}
~~~

Example response:
~~~
{
  "jsonrpc": "2.0",
  "id": 1,
  "result": {
    "enabled": false
  }
}
~~~

## start_subsystem_init {#rpc_start_subsystem_init}

Start initialization of SPDK subsystems when it is deferred by starting SPDK application with option -w.
During its deferral some RPCs can be used to set global parameters for SPDK subsystems.
This RPC can be called only once.

### Parameters

This method has no parameters.

### Response

Completion status of SPDK subsystem initialization is returned as a boolean.

### Example

Example request:
~~~
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "start_subsystem_init"
}
~~~

Example response:
~~~
{
  "jsonrpc": "2.0",
  "id": 1,
  "result": true
}
~~~

## get_rpc_methods {#rpc_get_rpc_methods}

Get an array of supported RPC methods.

### Parameters

Name                    | Optional | Type        | Description
----------------------- | -------- | ----------- | -----------
current                 | Optional | boolean     | Get an array of RPC methods only callable in the current state.

### Response

The response is an array of supported RPC methods.

### Example

Example request:
~~~
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "get_rpc_methods"
}
~~~

Example response:
~~~
{
  "jsonrpc": "2.0",
  "id": 1,
  "result": [
    "start_subsystem_init",
    "get_rpc_methods",
    "get_scsi_devices",
    "get_interfaces",
    "delete_ip_address",
    "add_ip_address",
    "get_nbd_disks",
    "stop_nbd_disk",
    "start_nbd_disk",
    "get_trace_flags",
    "clear_trace_flag",
    "set_trace_flag",
    "get_log_level",
    "set_log_level",
    "get_log_print_level",
    "set_log_print_level",
    "get_iscsi_global_params",
    "target_node_add_lun",
    "get_iscsi_connections",
    "delete_portal_group",
    "add_portal_group",
    "get_portal_groups",
    "delete_target_node",
    "delete_pg_ig_maps",
    "add_pg_ig_maps",
    "construct_target_node",
    "get_target_nodes",
    "delete_initiator_group",
    "delete_initiators_from_initiator_group",
    "add_initiators_to_initiator_group",
    "add_initiator_group",
    "get_initiator_groups",
    "set_iscsi_options",
    "set_bdev_options",
    "set_bdev_qos_limit_iops",
    "delete_bdev",
    "get_bdevs_config",
    "get_bdevs",
    "get_bdevs_iostat",
    "get_subsystem_config",
    "get_subsystems",
    "context_switch_monitor",
    "kill_instance",
    "scan_ioat_copy_engine",
    "construct_virtio_dev",
    "construct_virtio_pci_blk_bdev",
    "construct_virtio_user_blk_bdev",
    "get_virtio_scsi_devs",
    "remove_virtio_scsi_bdev",
    "construct_virtio_pci_scsi_bdev",
    "construct_virtio_user_scsi_bdev",
    "delete_aio_bdev",
    "construct_aio_bdev",
    "destruct_split_vbdev",
    "construct_split_vbdev",
    "bdev_inject_error",
    "delete_error_bdev",
    "construct_error_bdev",
    "construct_passthru_bdev",
    "apply_nvme_firmware",
    "construct_nvme_bdev",
    "construct_null_bdev",
    "delete_malloc_bdev",
    "construct_malloc_bdev",
    "get_lvol_stores",
    "destroy_lvol_bdev",
    "resize_lvol_bdev",
    "decouple_parent_lvol_bdev",
    "inflate_lvol_bdev",
    "rename_lvol_bdev",
    "clone_lvol_bdev",
    "snapshot_lvol_bdev",
    "construct_lvol_bdev",
    "destroy_lvol_store",
    "rename_lvol_store",
    "construct_lvol_store"
  ]
}
~~~

## get_subsystems {#rpc_get_subsystems}

Get an array of name and dependency relationship of SPDK subsystems in initialization order.

### Parameters

None

### Response

The response is an array of name and dependency relationship of SPDK subsystems in initialization order.

### Example

Example request:
~~~
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "get_subsystems"
}
~~~

Example response:
~~~
{
  "jsonrpc": "2.0",
  "id": 1,
  "result": [
    {
      "subsystem": "copy",
      "depends_on": []
    },
    {
      "subsystem": "interface",
      "depends_on": []
    },
    {
      "subsystem": "net_framework",
      "depends_on": [
        "interface"
      ]
    },
    {
      "subsystem": "bdev",
      "depends_on": [
        "copy"
      ]
    },
    {
      "subsystem": "nbd",
      "depends_on": [
        "bdev"
      ]
    },
    {
      "subsystem": "nvmf",
      "depends_on": [
        "bdev"
      ]
    },
    {
      "subsystem": "scsi",
      "depends_on": [
        "bdev"
      ]
    },
    {
      "subsystem": "vhost",
      "depends_on": [
        "scsi"
      ]
    },
    {
      "subsystem": "iscsi",
      "depends_on": [
        "scsi"
      ]
    }
  ]
}
~~~

## get_subsystem_config {#rpc_get_subsystem_config}

Get current configuration of the specified SPDK subsystem

### Parameters

Name                    | Optional | Type        | Description
----------------------- | -------- | ----------- | -----------
name                    | Required | string      | SPDK subsystem name

### Response

The response is current configuration of the specfied SPDK subsystem.
Null is returned if it is not retrievable by the get_subsystem_config method and empty array is returned if it is empty.

### Example

Example request:
~~~
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "get_subsystem_config",
  "params": {
    "name": "bdev"
  }
}
~~~

Example response:
~~~
{
  "jsonrpc": "2.0",
  "id": 1,
  "result": [
    {
      "params": {
        "base_bdev": "Malloc2",
        "split_size_mb": 0,
        "split_count": 2
      },
      "method": "construct_split_vbdev"
    },
    {
      "params": {
        "trtype": "PCIe",
        "name": "Nvme1",
        "traddr": "0000:01:00.0"
      },
      "method": "construct_nvme_bdev"
    },
    {
      "params": {
        "trtype": "PCIe",
        "name": "Nvme2",
        "traddr": "0000:03:00.0"
      },
      "method": "construct_nvme_bdev"
    },
    {
      "params": {
        "block_size": 512,
        "num_blocks": 131072,
        "name": "Malloc0",
        "uuid": "913fc008-79a7-447f-b2c4-c73543638c31"
      },
      "method": "construct_malloc_bdev"
    },
    {
      "params": {
        "block_size": 512,
        "num_blocks": 131072,
        "name": "Malloc1",
        "uuid": "dd5b8f6e-b67a-4506-b606-7fff5a859920"
      },
      "method": "construct_malloc_bdev"
    }
  ]
}
~~~

# Block Device Abstraction Layer {#jsonrpc_components_bdev}

## set_bdev_options {#rpc_set_bdev_options}

Set global parameters for the block device (bdev) subsystem.  This RPC may only be called
before SPDK subsystems have been initialized.

### Parameters

Name                    | Optional | Type        | Description
----------------------- | -------- | ----------- | -----------
bdev_io_pool_size       | Optional | number      | Number of spdk_bdev_io structures in shared buffer pool
bdev_io_cache_size      | Optional | number      | Maximum number of spdk_bdev_io structures cached per thread

### Example

Example request:
~~~
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "set_bdev_options",
  "params": {
    "bdev_io_pool_size": 65536,
    "bdev_io_cache_size": 256
  }
}
~~~

Example response:
~~~
{
  "jsonrpc": "2.0",
  "id": 1,
  "result": true
}
~~~

## get_bdevs {#rpc_get_bdevs}

Get information about block devices (bdevs).

### Parameters

The user may specify no parameters in order to list all block devices, or a block device may be
specified by name.

Name                    | Optional | Type        | Description
----------------------- | -------- | ----------- | -----------
name                    | Optional | string      | Block device name

### Response

The response is an array of objects containing information about the requested block devices.

### Example

Example request:
~~~
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "get_bdevs",
  "params": {
    "name": "Malloc0"
  }
}
~~~

Example response:
~~~
{
  "jsonrpc": "2.0",
  "id": 1,
  "result": [
    {
      "name": "Malloc0",
      "product_name": "Malloc disk",
      "block_size": 512,
      "num_blocks": 20480,
      "claimed": false,
      "supported_io_types": {
        "read": true,
        "write": true,
        "unmap": true,
        "write_zeroes": true,
        "flush": true,
        "reset": true,
        "nvme_admin": false,
        "nvme_io": false
      },
      "driver_specific": {}
    }
  ]
}
~~~

## get_bdevs_iostat {#rpc_get_bdevs_iostat}

Get I/O statistics of block devices (bdevs).

### Parameters

The user may specify no parameters in order to list all block devices, or a block device may be
specified by name.

Name                    | Optional | Type        | Description
----------------------- | -------- | ----------- | -----------
name                    | Optional | string      | Block device name

### Response

The response is an array of objects containing I/O statistics of the requested block devices.

### Example

Example request:
~~~
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "get_bdevs_iostat",
  "params": {
    "name": "Nvme0n1"
  }
}
~~~

Example response:
~~~
{
  "jsonrpc": "2.0",
  "id": 1,
  "result": [
    {
      "name": "Nvme0n1",
      "bytes_read": 34051522560,
      "num_read_ops": 8312910,
      "bytes_written": 0,
      "num_write_ops": 0
    }
  ]
}
~~~

## delete_bdev {#rpc_delete_bdev}

Unregister a block device.

### Example

Example request:
~~~
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "delete_bdev",
  "params": {
    "name": "Malloc0"
  }
}
~~~

Example response:
~~~
{
  "jsonrpc": "2.0",
  "id": 1,
  "result": true
}
~~~

### Parameters

Name                    | Optional | Type        | Description
----------------------- | -------- | ----------- | -----------
name                    | Required | string      | Block device name

## set_bdev_qos_limit_iops {#rpc_set_bdev_qos_limit_iops}

Set an IOPS-based quality of service rate limit on a bdev.

### Parameters

Name                    | Optional | Type        | Description
----------------------- | -------- | ----------- | -----------
name                    | Required | string      | Block device name
ios_per_sec             | Required | number      | Number of I/Os per second to allow. 0 means unlimited.

### Example

Example request:
~~~
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "set_bdev_qos_limit_iops",
  "params": {
    "name": "Malloc0"
    "ios_per_sec": 20000
  }
}
~~~

Example response:
~~~
{
  "jsonrpc": "2.0",
  "id": 1,
  "result": true
}
~~~

# NVMe-oF Target {#jsonrpc_components_nvmf_tgt}

## get_nvmf_subsystems method {#rpc_get_nvmf_subsystems}

### Parameters

This method has no parameters.

### Example

Example request:
~~~
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "get_nvmf_subsystems"
}
~~~

Example response:
~~~
{
  "jsonrpc": "2.0",
  "id": 1,
  "result": [
    {
      "nqn": "nqn.2014-08.org.nvmexpress.discovery",
      "subtype": "Discovery"
      "listen_addresses": [],
      "hosts": [],
      "allow_any_host": true
    },
    {
      "nqn": "nqn.2016-06.io.spdk:cnode1",
      "subtype": "NVMe",
      "listen_addresses": [
        {
          "trtype": "RDMA",
          "adrfam": "IPv4",
          "traddr": "192.168.0.123",
          "trsvcid": "4420"
        }
      ],
      "hosts": [
        {"nqn": "nqn.2016-06.io.spdk:host1"}
      ],
      "allow_any_host": false,
      "serial_number": "abcdef",
      "namespaces": [
        {"nsid": 1, "name": "Malloc2"},
        {"nsid": 2, "name": "Nvme0n1"}
      ]
    }
  ]
}
~~~

## construct_nvmf_subsystem method {#rpc_construct_nvmf_subsystem}

Construct an NVMe over Fabrics target subsystem.

### Parameters

Name                    | Optional | Type        | Description
----------------------- | -------- | ----------- | -----------
nqn                     | Required | string      | Subsystem NQN
listen_addresses        | Optional | array       | Array of @ref rpc_construct_nvmf_subsystem_listen_address objects
hosts                   | Optional | array       | Array of strings containing allowed host NQNs. Default: No hosts allowed.
allow_any_host          | Optional | boolean     | Allow any host (`true`) or enforce allowed host whitelist (`false`). Default: `false`.
serial_number           | Required | string      | Serial number of virtual controller
namespaces              | Optional | array       | Array of @ref rpc_construct_nvmf_subsystem_namespace objects. Default: No namespaces.
max_namespaces          | Optional | number      | Maximum number of namespaces that can be attached to the subsystem. Default: 0 (Unlimited)

### listen_address {#rpc_construct_nvmf_subsystem_listen_address}

Name                    | Optional | Type        | Description
----------------------- | -------- | ----------- | -----------
trtype                  | Required | string      | Transport type ("RDMA")
adrfam                  | Required | string      | Address family ("IPv4", "IPv6", "IB", or "FC")
traddr                  | Required | string      | Transport address
trsvcid                 | Required | string      | Transport service ID

### namespace {#rpc_construct_nvmf_subsystem_namespace}

Name                    | Optional | Type        | Description
----------------------- | -------- | ----------- | -----------
nsid                    | Optional | number      | Namespace ID between 1 and 4294967294, inclusive. Default: Automatically assign NSID.
bdev_name               | Required | string      | Name of bdev to expose as a namespace.
nguid                   | Optional | string      | 16-byte namespace globally unique identifier in hexadecimal (e.g. "ABCDEF0123456789ABCDEF0123456789")
eui64                   | Optional | string      | 8-byte namespace EUI-64 in hexadecimal (e.g. "ABCDEF0123456789")
uuid                    | Optional | string      | RFC 4122 UUID (e.g. "ceccf520-691e-4b46-9546-34af789907c5")

### Example

Example request:

~~~
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "construct_nvmf_subsystem",
  "params": {
    "nqn": "nqn.2016-06.io.spdk:cnode1",
    "listen_addresses": [
      {
        "trtype": "RDMA",
        "adrfam": "IPv4",
        "traddr": "192.168.0.123",
        "trsvcid: "4420"
      }
    ],
    "hosts": [
      "nqn.2016-06.io.spdk:host1",
      "nqn.2016-06.io.spdk:host2"
    ],
    "allow_any_host": false,
    "serial_number": "abcdef",
    "namespaces": [
      {"nsid": 1, "name": "Malloc2"},
      {"nsid": 2, "name": "Nvme0n1"}
    ]
  }
}
~~~

Example response:

~~~
{
  "jsonrpc": "2.0",
  "id": 1,
  "result": true
}
~~~

## delete_nvmf_subsystem method {#rpc_delete_nvmf_subsystem}

Delete an existing NVMe-oF subsystem.

### Parameters

Parameter              | Optional | Type        | Description
---------------------- | -------- | ----------- | -----------
nqn                    | Required | string      | Subsystem NQN to delete.

### Example

Example request:

~~~
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "delete_nvmf_subsystem",
  "params": {
    "nqn": "nqn.2016-06.io.spdk:cnode1"
  }
}
~~~

Example response:

~~~
{
  "jsonrpc": "2.0",
  "id": 1,
  "result": true
}
~~~

## nvmf_subsystem_add_listener  method {#rpc_nvmf_subsystem_add_listener}

Add a new listen address to an NVMe-oF subsystem.

### Parameters

Name                    | Optional | Type        | Description
----------------------- | -------- | ----------- | -----------
nqn                     | Required | string      | Subsystem NQN
listen_address          | Required | object      | @ref rpc_construct_nvmf_subsystem_listen_address object

### Example

Example request:

~~~
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "nvmf_subsystem_add_listener",
  "params": {
    "nqn": "nqn.2016-06.io.spdk:cnode1",
    "listen_address": {
      "trtype": "RDMA",
      "adrfam": "IPv4",
      "traddr": "192.168.0.123",
      "trsvcid: "4420"
    }
  }
}
~~~

Example response:

~~~
{
  "jsonrpc": "2.0",
  "id": 1,
  "result": true
}
~~~

## nvmf_subsystem_add_ns method {#rpc_nvmf_subsystem_add_ns}

Add a namespace to a subsystem. The namespace ID is returned as the result.

### Parameters

Name                    | Optional | Type        | Description
----------------------- | -------- | ----------- | -----------
nqn                     | Required | string      | Subsystem NQN
namespace               | Required | object      | @ref rpc_construct_nvmf_subsystem_namespace object

### Example

Example request:

~~~
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "nvmf_subsystem_add_ns",
  "params": {
    "nqn": "nqn.2016-06.io.spdk:cnode1",
    "namespace": {
      "nsid": 3,
      "bdev_name": "Nvme0n1"
    }
  }
}
~~~

Example response:

~~~
{
  "jsonrpc": "2.0",
  "id": 1,
  "result": 3
}
~~~

## nvmf_subsystem_remove_ns method {#rpc_nvmf_subsystem_remove_ns}

Remove a namespace from a subsystem.

### Parameters

Name                    | Optional | Type        | Description
----------------------- | -------- | ----------- | -----------
nqn                     | Required | string      | Subsystem NQN
nsid                    | Required | number      | Namespace ID

### Example

Example request:

~~~
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "nvmf_subsystem_remove_ns",
  "params": {
    "nqn": "nqn.2016-06.io.spdk:cnode1",
    "nsid": 1
  }
}
~~~

Example response:

~~~
{
  "jsonrpc": "2.0",
  "id": 1,
  "result": true
}
~~~

## nvmf_subsystem_add_host method {#rpc_nvmf_subsystem_add_host}

Add a host NQN to the whitelist of allowed hosts.

### Parameters

Name                    | Optional | Type        | Description
----------------------- | -------- | ----------- | -----------
nqn                     | Required | string      | Subsystem NQN
host                    | Required | string      | Host NQN to add to the list of allowed host NQNs

### Example

Example request:

~~~
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "nvmf_subsystem_add_host",
  "params": {
    "nqn": "nqn.2016-06.io.spdk:cnode1",
    "host": "nqn.2016-06.io.spdk:host1"
  }
}
~~~

Example response:

~~~
{
  "jsonrpc": "2.0",
  "id": 1,
  "result": true
}
~~~

## nvmf_subsystem_remove_host method {#rpc_nvmf_subsystem_remove_host}

Remove a host NQN from the whitelist of allowed hosts.

### Parameters

Name                    | Optional | Type        | Description
----------------------- | -------- | ----------- | -----------
nqn                     | Required | string      | Subsystem NQN
host                    | Required | string      | Host NQN to remove from the list of allowed host NQNs

### Example

Example request:

~~~
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "nvmf_subsystem_remove_host",
  "params": {
    "nqn": "nqn.2016-06.io.spdk:cnode1",
    "host": "nqn.2016-06.io.spdk:host1"
  }
}
~~~

Example response:

~~~
{
  "jsonrpc": "2.0",
  "id": 1,
  "result": true
}
~~~

## nvmf_subsystem_allow_any_host method {#rpc_nvmf_subsystem_allow_any_host}

Configure a subsystem to allow any host to connect or to enforce the host NQN whitelist.

### Parameters

Name                    | Optional | Type        | Description
----------------------- | -------- | ----------- | -----------
nqn                     | Required | string      | Subsystem NQN
allow_any_host          | Required | boolean     | Allow any host (`true`) or enforce allowed host whitelist (`false`).

### Example

Example request:

~~~
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "nvmf_subsystem_allow_any_host",
  "params": {
    "nqn": "nqn.2016-06.io.spdk:cnode1",
    "allow_any_host": true
  }
}
~~~

Example response:

~~~
{
  "jsonrpc": "2.0",
  "id": 1,
  "result": true
}
~~~

## set_nvmf_target_options {#rpc_set_nvmf_target_options}

Set global parameters for the NVMe-oF target.  This RPC may only be called before SPDK subsystems
have been initialized.

### Parameters

Name                    | Optional | Type        | Description
----------------------- | -------- | ----------- | -----------
max_queue_depth         | Optional | number      | Maximum number of outstanding I/Os per queue
max_qpairs_per_ctrlr    | Optional | number      | Maximum number of SQ and CQ per controller
in_capsule_data_size    | Optional | number      | Maximum number of in-capsule data size
max_io_size             | Optional | number      | Maximum I/O size (bytes)
max_subsystems          | Optional | number      | Maximum number of NVMe-oF subsystems
io_unit_size            | Optional | number      | I/O unit size (bytes)

### Example

Example request:
~~~
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "set_nvmf_target_options",
  "params": {
    "in_capsule_data_size": 4096,
    "io_unit_size": 131072,
    "max_qpairs_per_ctrlr": 64,
    "max_queue_depth": 128,
    "max_io_size": 131072,
    "max_subsystems": 1024
  }
}
~~~

Example response:
~~~
{
  "jsonrpc": "2.0",
  "id": 1,
  "result": true
}
~~~

## set_nvmf_target_config {#rpc_set_nvmf_target_config}

Set global configuration of NVMe-oF target.  This RPC may only be called before SPDK subsystems
have been initialized.

### Parameters

Name                    | Optional | Type        | Description
----------------------- | -------- | ----------- | -----------
acceptor_poll_rate      | Optional | number      | Polling interval of the acceptor for incoming connections (microseconds)

### Example

Example request:
~~~
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "set_nvmf_target_config",
  "params": {
    "acceptor_poll_rate": 10000
  }
}
~~~

Example response:
~~~
{
  "jsonrpc": "2.0",
  "id": 1,
  "result": true
}
~~~

# Logical Volume {#jsonrpc_components_lvol}

Identification of logical volume store and logical volume is explained first.

A logical volume store has a UUID and a name for its identification.
The UUID is generated on creation and it can be used as a unique identifier.
The name is specified on creation and can be renamed.
Either UUID or name is used to access logical volume store in RPCs.

A logical volume has a UUID and a name for its identification.
The UUID of the logical volume is generated on creation and it can be unique identifier.
The alias of the logical volume takes the format _lvs_name/lvol_name_ where:
* _lvs_name_ is the name of the logical volume store.
* _lvol_name_ is specified on creation and can be renamed.

## construct_lvol_store {#rpc_construct_lvol_store}

Construct a logical volume store.

### Parameters

Name                    | Optional | Type        | Description
----------------------- | -------- | ----------- | -----------
bdev_name               | Required | string      | Bdev on which to construct logical volume store
lvs_name                | Required | string      | Name of the logical volume store to create
cluster_sz              | Optional | number      | Cluster size of the logical volume store in bytes

### Reponse

UUID of the created logical volume store is returned.

### Example

Example request:
~~~
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "construct_lvol_store",
  "params": {
    "lvs_name": "LVS0",
    "bdev_name": "Malloc0"
  }
}
~~~

Example response:
~~~
{
  "jsonrpc": "2.0",
  "id": 1,
  "result": "a9959197-b5e2-4f2d-8095-251ffb6985a5"
}
~~~

## destroy_lvol_store {#rpc_destroy_lvol_store}

Destroy a logical volume store.

### Parameters

Name                    | Optional | Type        | Description
----------------------- | -------- | ----------- | -----------
uuid                    | Optional | string      | UUID of the logical volume store to destroy
lvs_name                | Optional | string      | Name of the logical volume store to destroy

Either uuid or lvs_name must be specified, but not both.

### Example

Example request:
~~~
{
  "jsonrpc": "2.0",
  "method": "destroy_lvol_store",
  "id": 1
  "params": {
    "uuid": "a9959197-b5e2-4f2d-8095-251ffb6985a5"
  }
}
~~~

Example response:
~~~
{
  "jsonrpc": "2.0",
  "id": 1,
  "result": true
}
~~~

## get_lvol_stores {#rpc_get_lvol_stores}

Get a list of logical volume stores.

### Parameters

Name                    | Optional | Type        | Description
----------------------- | -------- | ----------- | -----------
uuid                    | Optional | string      | UUID of the logical volume store to retrieve information about
lvs_name                | Optional | string      | Name of the logical volume store to retrieve information about

Either uuid or lvs_name may be specified, but not both.
If both uuid and lvs_name are omitted, information about all logical volume stores is returned.

### Example

Example request:
~~~
{
  "jsonrpc": "2.0",
  "method": "get_lvol_stores",
  "id": 1,
  "params": {
    "lvs_name": "LVS0"
  }
}
~~~

Example response:
~~~
{
  "jsonrpc": "2.0",
  "id": 1,
  "result": [
    {
      "uuid": "a9959197-b5e2-4f2d-8095-251ffb6985a5",
      "base_bdev": "Malloc0",
      "free_clusters": 31,
      "cluster_size": 4194304,
      "total_data_clusters": 31,
      "block_size": 4096,
      "name": "LVS0"
    }
  ]
}
~~~

## rename_lvol_store {#rpc_rename_lvol_store}

Rename a logical volume store.

### Parameters

Name                    | Optional | Type        | Description
----------------------- | -------- | ----------- | -----------
old_name                | Required | string      | Existing logical volume store name
new_name                | Required | string      | New logical volume store name

### Example

Example request:
~~~
{
  "jsonrpc": "2.0",
  "method": "rename_lvol_store",
  "id": 1,
  "params": {
    "old_name": "LVS0",
    "new_name": "LVS2"
  }
}
~~~

Example response:
~~~
{
  "jsonrpc": "2.0",
  "id": 1,
  "result": true
}
~~~

## construct_lvol_bdev {#rpc_construct_lvol_bdev}

Create a logical volume on a logical volume store.

### Parameters

Name                    | Optional | Type        | Description
----------------------- | -------- | ----------- | -----------
lvol_name               | Required | string      | Name of logical volume to create
size                    | Required | number      | Desired size of logical volume in bytes
thin_provision          | Optional | boolean     | True to enable thin provisioning
uuid                    | Optional | string      | UUID of logical volume store to create logical volume on
lvs_name                | Optional | string      | Name of logical volume store to create logical volume on

Size will be rounded up to a multiple of cluster size. Either uuid or lvs_name must be specified, but not both.
lvol_name will be used in the alias of the created logical volume.

### Response

UUID of the created logical volume is returned.

### Example

Example request:
~~~
{
  "jsonrpc": "2.0",
  "method": "construct_lvol_bdev",
  "id": 1,
  "params": {
    "lvol_name": "LVOL0",
    "size": 1048576,
    "lvs_name": "LVS0",
    "thin_provision": true
  }
}
~~~

Example response:
~~~
{
  "jsonrpc": "2.0",
  "id": 1,
  "result": "1b38702c-7f0c-411e-a962-92c6a5a8a602"
}
~~~

## snapshot_lvol_bdev {#rpc_snapshot_lvol_bdev}

Capture a snapshot of the current state of a logical volume.

### Parameters

Name                    | Optional | Type        | Description
----------------------- | -------- | ----------- | -----------
lvol_name               | Required | string      | UUID or alias of the logical volume to create a snapshot from
snapshot_name           | Required | string      | Name for the newly created snapshot

### Response

UUID of the created logical volume snapshot is returned.

### Example

Example request:
~~~
{
  "jsonrpc": "2.0",
  "method": "snapshot_lvol_bdev",
  "id": 1,
  "params": {
    "lvol_name": "1b38702c-7f0c-411e-a962-92c6a5a8a602",
    "snapshot_name": "SNAP1"
  }
}
~~~

Example response:
~~~
{
  "jsonrpc": "2.0",
  "id": 1,
  "result": "cc8d7fdf-7865-4d1f-9fc6-35da8e368670"
}
~~~

## clone_lvol_bdev {#rpc_clone_lvol_bdev}

Create a logical volume based on a snapshot.

### Parameters

Name                    | Optional | Type        | Description
----------------------- | -------- | ----------- | -----------
snapshot_name           | Required | string      | UUID or alias of the snapshot to clone
clone_name              | Required | string      | Name for the logical volume to create

### Response

UUID of the created logical volume clone is returned.

### Example

Example request:
~~~
{
  "jsonrpc": "2.0"
  "method": "clone_lvol_bdev",
  "id": 1,
  "params": {
    "snapshot_name": "cc8d7fdf-7865-4d1f-9fc6-35da8e368670",
    "clone_name": "CLONE1"
  }
}
~~~

Example response:
~~~
{
  "jsonrpc": "2.0",
  "id": 1,
  "result": "8d87fccc-c278-49f0-9d4c-6237951aca09"
}
~~~

## rename_lvol_bdev {#rpc_rename_lvol_bdev}

Rename a logical volume. New name will rename only the alias of the logical volume.

### Parameters

Name                    | Optional | Type        | Description
----------------------- | -------- | ----------- | -----------
old_name                | Required | string      | UUID or alias of the existing logical volume
new_name                | Required | string      | New logical volume name

### Example

Example request:
~~~
{
  "jsonrpc": "2.0",
  "method": "rename_lvol_bdev",
  "id": 1,
  "params": {
    "old_name": "067df606-6dbc-4143-a499-0d05855cb3b8",
    "new_name": "LVOL2"
  }
}
~~~

Example response:
~~~
{
  "jsonrpc": "2.0",
  "id": 1,
  "result": true
}
~~~

## resize_lvol_bdev {#rpc_resize_lvol_bdev}

Resize a logical volume.

### Parameters

Name                    | Optional | Type        | Description
----------------------- | -------- | ----------- | -----------
name                    | Required | string      | UUID or alias of the logical volume to resize
size                    | Required | number      | Desired size of the logical volume in bytes

### Example

Example request:
~~~
{
  "jsonrpc": "2.0",
  "method": "resize_lvol_bdev",
  "id": 1,
  "params": {
    "name": "51638754-ca16-43a7-9f8f-294a0805ab0a",
    "size": 2097152
  }
}
~~~

Example response:
~~~
{
  "jsonrpc": "2.0",
  "id": 1,
  "result": true
}
~~~

## destroy_lvol_bdev {#rpc_destroy_lvol_bdev}

Destroy a logical volume.

### Parameters

Name                    | Optional | Type        | Description
----------------------- | -------- | ----------- | -----------
name                    | Required | string      | UUID or alias of the logical volume to destroy

### Example

Example request:
~~~
{
  "jsonrpc": "2.0",
  "method": "destroy_lvol_bdev",
  "id": 1,
  "params": {
    "name": "51638754-ca16-43a7-9f8f-294a0805ab0a"
  }
}
~~~

Example response:
~~~
{
  "jsonrpc": "2.0",
  "id": 1,
  "result": true
}
~~~

## inflate_lvol_bdev {#rpc_inflate_lvol_bdev}

Inflate a logical volume. All unallocated clusters are allocated and copied from the parent or zero filled if not allocated in the parent. Then all dependencies on the parent are removed.

### Parameters

Name                    | Optional | Type        | Description
----------------------- | -------- | ----------- | -----------
name                    | Required | string      | UUID or alias of the logical volume to inflate

### Example

Example request:
~~~
{
  "jsonrpc": "2.0",
  "method": "inflate_lvol_bdev",
  "id": 1,
  "params": {
    "name": "8d87fccc-c278-49f0-9d4c-6237951aca09"
  }
}
~~~

Example response:
~~~
{
  "jsonrpc": "2.0",
  "id": 1,
  "result": true
}
~~~

## decouple_parent_lvol_bdev {#rpc_decouple_parent_lvol_bdev}

Decouple the parent of a logical volume. For unallocated clusters which is allocated in the parent, they are allocated and copied from the parent, but for unallocated clusters which is thin provisioned in the parent, they are kept thin provisioned. Then all dependencies on the parent are removed.

### Parameters

Name                    | Optional | Type        | Description
----------------------- | -------- | ----------- | -----------
name                    | Required | string      | UUID or alias of the logical volume to decouple the parent of it

### Example

Example request:
~~~
{
  "jsonrpc": "2.0",
  "method": "decouple_parent_lvol_bdev",
  "id": 1.
  "params": {
    "name": "8d87fccc-c278-49f0-9d4c-6237951aca09"
  }
}
~~~

Example response:
~~~
{
  "jsonrpc": "2.0",
  "id": 1,
  "result": true
}
~~~