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...ades when free space is below a certain amount b) data is written to different vdevs depending on free space So a) how do I determine the exact value when performance degrades and how significant is it? b) has that threshold been reached (or exceeded?) in the first six vdevs? and if so are the two emptier vdevs being used exclusively to prevent performance degrading so it will only degrade when all vdevs reach the magic 18.1% free (or whatever it is)? Presumably there''s no way to identify which files are on which vdevs in order to delete them and recover the performance? Thanks for any ex...