VO
а вот пишут
--reclassify-root <root-name> <device-class>
This will take everything in the hierarchy beneath root-name and adjust any rules that reference that root via a take <root-name> to instead take <root-name> class <device-class>. It renumbers the buckets in such a way that the old IDs are instead used for the specified class’s “shadow tree” so that no data movement takes place.
--reclassify-root <root-name> <device-class>
This will take everything in the hierarchy beneath root-name and adjust any rules that reference that root via a take <root-name> to instead take <root-name> class <device-class>. It renumbers the buckets in such a way that the old IDs are instead used for the specified class’s “shadow tree” so that no data movement takes place.