-----Allen S. Rout wrote: ----- >I've whined about this from time to time... I've had tapes 10% full >get 60% reclaimable and then they get copied. I see no reason to >reclaim a filling tape unless you figure you can get back at least > > (reclaimpercent * max(estcapacity,actualcap)) > >bytes. In other words, -never- waste your effort trying to copy a >tape that's only 1/3 full.
Reclaiming a full volume that was 60% reclaimable would create a volume with 100% of its capacity available for future writes, at the cost of using 40% of a volume to relocate the surviving contents. This is a net gain of 60% of a volume available for future writes. The reclamation you describe still creates a volume with 100% of its capacity available for future writes, at the cost of writing off the 30% of the volume that was available for future writes and using 10% of another volume to relocate the contents. This results in the same net gain of 60% of a volume available for future writes with only a quarter of the amount of data movement. I don't see why you find this objectionable.
