Hi @mramospe, minor comment, the compression for Hlt2 should be `zstd -3` (i.e. default compression) rather than `zstd -5`, as this better mimics what is used by the data-movers. (See: https://gitlab.cern.ch/lhcb-datapkg/PRConfig/-/merge_requests/446#note_8388797). I doubt it has a _significant_ effect.