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OneFS supports filesystem extended attributes. Extended attributes are arbitrary metadata tags in the form of <key/value> pairs that can be applied to files and directories. Extended attributes are not visible in the graphical interface or when accessing files over a share or export. However, the attributes can be accessed using the OneFS CLI using the getexattr and setextattr commands. The SmartPools job engine will move data between node pools based on file attribute. This SmartPools functionality will be leveraged for on-demand data tiering based on the metadata contained in the file extended attributes.
Crucially, OneFS supports writing file system extended attributes from an external script using the OneFS REST API. The OneFS API Reference Guide has information about setting and reading back file system extended attributes.