I've read Craig's book, and seen warning after warning against using NSS
storage for cache volumes. However, I don't recall seeing many arguments
why you're not supposed to do it...other than "don't do it" and "BM was
designed for low-level access to traditional volumes".

All of the storage in this network is configured as NSS. We'd have to go
buy new disks and configure them as traditional in order to do it by the
book. (It was set up this way when we got here).

We really need to use SAN storage for proxy caching--it's fast, there are
multiple TBs of space available to us, and we don't have to ask the client
to go spend any money.

Is this the reason we get a lot of 502 and 504 errors?