Justifying FS-Cache

I'm using it to allow my desktop box to boot from NFS, with (almost) no local storage other than FS caching: it's all on a remote system, because that happens to be a five-disk RAID-6 (md) array which I trust my data with more than a single-disk desktop: but I want that desktop to be local-disk fast nearly all the time.

Think of it as a poor man's hierarchical storage.

It rocks. (And it saved my bacon when I had a disk failure half a year ago.) :)