I need to create a lot of temporary files for which I need to have fast access, so I'm thinking about using a RAM disk. The problem is that the temporary files might get pretty big (1-4 GB) and in this case the disk-storage would be OK.
Is there any way to create a mix between a RAM disk and a physical HDD, so that the HDD gets used in the worst case (when I meet the big temporary files)?
I cannot afford faster SSD's, and I don't need persistent storage, and I don't need 100 GB of temporary data. I'm using my home computer for this (2 GHz AMD system...). I received a tip about UnionFS. What is the experience with it?