[ceph-users] Bluestore migration: per-osd device copy

Hi, The docs have scant detail on doing a migration to bluestore using a per-osd device copy: https://docs.ceph.com/en/latest/rados/operations/bluestore-migration/#per-os... This mentions "using the copy function of ceph-objectstore-tool", but ceph-objectstore-tool doesn't have a copy function (all the way from v9 to current). Has anyone actually tried doing this? Is there any further detail available on what is involved, e.g. a broad outline of the steps? Of course, detailed instructions would be even better, even if accompanied by "here be dragons!" warnings. Cheers, Chris