in Ideas · 76 words

A filesystem that concatenates files from an underlying filesystem -- for instance, putting multipart VOB files from a DVD back together. This could be extended to do various RAID-style things with a file, encoded in the filename or passed to a control program ("mkcatfile linear /catfs/cat1 file1 file2 file3").

Piet Delport pointed out that you can do this at the block-device layer with many software RAID systems these days, which is definitely neater for the above usage.