I worked on Penguin's HPC offering a few years back. It PXE boots all of the compute nodes in a lightweight manner, and builds the entire cluter into a single process space. Distributed process space means that a signal sent to a parent process running on one node gets correctly forwarded to a child process running on another. You will not find an easier way to manage the cluster than Scyld.

http://www.penguincomputing.com/software

It can install on top of Red Hat Enterprise Linux or the Comparable CentOS

Disclaimer, I worked on the produce for a number of years. I now work at a different Linux company...

Scyld is built on top of Red Hat EL, can also run with CentOS, but uses a custom Kernel. It has a lightweight provisioning mechanism that makes maintenance of compute nodes very easy, and the single system image approach makes job management significantly easier than a traditional Beowulf cluster. I don't know if they test it out with Scientific Linux these days.

Thee current RFC 1738 http://www.faqs.org/rfcs/rfc1738.html Only allows URLs to be composed of

" Within those parts, an octet may be represented by the chararacter which has that octet as its code within the US-ASCII [20] coded character set. In addition, octets may be encoded by a character triplet consisting of the character "%" followed by the two hexadecimal digits (from "0123456789ABCDEF") which forming the hexadecimal value of the octet. (The characters "abcdef" may also be used in hexadecimal encodings.)"

So A-Z and %ddd Just ain't gonna cut it.

Currently URLs are in the ASCII subset of utf-8. What are they going to be in in the future?

What about languages that go from right to left like Hebrew and Arabic?