the last time I played with Plan9, I downloaded the i386 version for
my little machine, but they also had versions for storage and compute
servers on lots of different architectures.  I downloaded it from Bell
Labs web site when I got it, but that was sometime ago.

At that time you had to have a i386 type machine to start it up to
setup initial controller but then you could turn on IBM, CDC, DEC,
SUN, and i386 type machines used for various purposes in the 'net that
Plan9 is.

One of the neatest features I remember was the 'no erase' file system.
 All files were written to disk, then one time writable media.  You
could 'cd' to any point in the past to see what the entire file system
(you have permissions to read) looked like at any point in time.

If this was implemented right, we would have warehouses of DVD's (they
used WORM technologies at the time).

The one time I talked with Dennis Richie, we spoke about Plan9.  He
spoke about the file system and how it was handled.  Evidently
whenever WORM was upgraded (doubled every year or so in density) they
would actually migrate to new WORM all the historic data, and it was
only the doubling of density that kept WORM viable for their use.  It
was a fun conversation.  Dennis was a neat man to meet.

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