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targetd API, version 0.6


targetd exposes a remote API for configuring a Linux host to perform a block-based storage array role and a file system storage role. API calls use the jsonrpc-2.0 format over HTTP, on TCP port 18700. The API optionally uses TLS for connection encryption, but does authentication via HTTP Basic auth for both encrypted and non-encrypted connections.


Raw storage space on the host is a pool. From a pool, a volume vol is allocated. A volume is shared with remote hosts via an export.

For file system related operations, the pool refers to a btrfs mount point. Each newly created file system is a subvolume on that mount point.


  • All sizes are in bytes, and are passed as numbers.
  • All names must only contain characters in '[a-z][A-Z][0-9]_-'
  • Uuid fields are represented as strings.
  • If an error occurs, it will be indicated by returning a jsonrpc error object with a negative error code. Non-negative error codes (including 0) are not defined.

Pool operations

Pools are configured on the host, and are not remotely configurable via this API.


Returns an array of pool objects. Each pool object contains name, size, free_size, and type fields, and may also contain a 'uuid' field. The domain of the type field is [block|fs].

Volume operations


Returns an array of volume objects in pool. Each volume object contains name, size, and uuid fields.

Volume names may be reused, such as when a volume is created and then removed. Another volume could then be created with the same name, but the new volume's UUID would be a different, unique value.

vol_create(pool, name, size)

Creates a volume named name with size size in the pool pool.

vol_destroy(pool, name)

Removes name volume from pool pool. This destroys the backing data, and the data in the volume is lost even if another volume with the same name is created.

vol_copy(pool, vol_orig, vol_new)

Creates a new volume named vol_new in pool the same size as vol_orig in pool, and copies the contents from vol_orig into vol_new. vol_orig and vol_new will have differing UUIDs.

Export operations

Exports make a volume accessible to a remote iSCSI initiator.


Returns an array of export objects. Each export object contains initiator_wwn, lun, vol_name, vol_size, vol_uuid, and pool. initiator_wwn is the iSCSI name (iqn.*) of the initiator with access to the export. lun is the SCSI logical unit number the initiator will see for this export. vol_name is the name of the backing volume. vol_uuid and vol_size return the unique identifier and size of the volume. The pool attribute is the name of the pool containing the backing volume.

export_create(pool, vol, initiator_wwn, lun)

Creates an export of volume vol in pool pool to the given initiator, and maps it to logical unit number lun.

export_destroy(pool, vol, initiator_wwn)

Removes an export of vol in pool to initiator_wwn.

Initiator operations

initiator_set_auth(initiator_wwn, in_user, in_pass, out_user, out_pass)

Sets the inbound and outbound login credentials for the given initiator. 'in_user' and 'in_pass' are credentials that the initiator will use to login to the target and access luns exported by 'export_create'. 'out_user' and 'out_pass' are the credentials the target will use to authenticate itself back to the initiator.

'initiator_wwn' must be set, but 'in_user', 'in_pass', 'out_user' and 'out_pass' may be 'null'. If either or both of each directions' parameters are 'null', then authentication is disabled for that direction.

Calling this method is not required for exports to work. If it is not called, exports require no authentication.

File system operations

Ability to create different file systems and perform operation on them. The pool is a btrfs sub volume and new file systems are sub volumes within that sub volume.


Returns an array of file system objects. Each file system object contains: name, uuid, total_space, free_space and pool they were created from.


Destroys the sub volume identified by file system uuid and any snapshots created from it.

fs_create(pool_name, name, size_bytes)

Create a new sub volume within the specified pool_name with the new name. The parameter size_bytes is currently ignored, but will eventually be used to set the quota for the sub volume.

fs_clone(fs_uuid, dest_fs_name, snapshot_id)

Create a read/write-able copy of the file system with uuid fs_uuid to the new name of dest_fs_name. If snapshot_id is specified the new file system contents will be created from the snapshot copy.


Returns an array of read only snapshot objects for the file system specified in fs_uuid. The returned objects contain: name, uuid, timestamp. Time stamp is when the snapshot was taken and it is represented as seconds from epoch.

fs_snapshot(fs_uuid, dest_ss_name)

Creates a read only copy of the file system specified by fs_uuid. The new file system has the name represented by dest_ss_name.

fs_snapshot_delete(fs_uuid, ss_uuid)

Deletes the read only snapshot specified by fs_uuid and ss_uuid.

NFS Export operations


Returns an array of supported NFS client authentication mechanisms.


Returns an array of export objects. Each export object contains: host, path, options.

nfs_export_add(host, path, options)

Adds a NFS export given a host, and an export path to export and a list of options Options is a list of NFS export options. Each option can be either a single value eg. no_root_squash or can be a key=value like sec=sys. See man 5 exports for all available supported options and the formats supported for host.

nfs_export_remove(host, path)

Removes a NFS export given a host and an export path

Async method calls

Obsolete, no longer defined.

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