After a period of time, the large SMP machine becomes free, and your interactive job starts on the slow machine, and then, a few moments later, picks up from where it left off on the fast machine. Since many commercial apps are static linked, I'm leaning towards the first strategy for now. AFS does some of this and is very nice, but is commercial and rather pricey. Its cost has probably impacted the acceptance of this otherwise exciting technology. A simple global filesystem is a logical extension for Queue.
All projects are kernel-level.
This means our Solaris users would be out of luck. ACLs are needed in global networked filesystems, but AFS's are not completely backwards compatible with Unix, so some software has trouble running. AFS stores files in a non-standard way on its servers, so you need to run a special fsck on the servers to prevent it from nuking your server's filesystem. However, these projects look like a very promising start. One thing that we might want to do is write an NFS translator client for either Coda or GFS, so that unsupported systems with NFS access can import these filesystems.