> > For now I have no plans to backup such large VMs. > > 640k ought to be enough for anybody? > > Code is easy enough to change that "works for now" can be good enough. > Changing file formats and external interfaces is hard, though, so better get > it > right the first time. I don't want to get patches for a new format in a year > or two > just because 128T was enough for the first few users.
The limits are not really arbitrary - I choose them carefully to keep the overhead small. We currently only need 8 bytes per cluster, which results in small files. So I guess it is better to use a different format (version) if you want to store such big files.
