On 11/8/10 5:10 PM, auringer
tds.net wrote:
Actually
I'm pretty sure it's possible to disable the bus arbiter and make
them just pull power from the bus. I'm not 100% certain but I believe I've
seen it done.
I was going with what Sun said.
*snicker* One thing I'm fond of saying is "The people who know the
least about Sun computers are Sun employees".
I was the guy who figured out that it really is possible to put a row
of Sun-3/50 or 3/60 machines in an x/x80 VME chassis, and in doing so
put together what I believe to have been the first of what we now call
"blade servers", at an ISP in early 1993. Later I did the same thing
with 4/600 boards, building the same thing but with faster "blades". (I
have always the term "blade" as it is commonly applied here)
The 3/50 and 3/60 only pull power from the bus, so that was easy.
The 4/600 is a real VME machine, so it required more fancy footwork; you
need to prevent it from trying to be a bus master. I did that by
locking their VMEbus arbiters into loopback mode in OBP, which works
like a charm. (once I got all the OBP ROMs updated to the version that
supported loopback mode, that is)
Both of these things "could not possibly work", "never",
"definitely
not", etc etc, according to Sun engineering. Then, on the phone, I told
the guy I was leaning up against one that had been running for weeks
with customers on it. That was fun. :)
I actually have four of them and
thought it would cool to set them up as a quad processor system. Do
you have a pointer to where someone has done this?
I do not. I know I've seen a single chassis with several CP1500s in
it on different buses in a redundant configuration (this was a
controller for a Summa VCO-4K phone switch) but I think I've seen them
in a master/slave scenario somewhere. I may be thinking of something
else though.
-Dave
--
Dave McGuire
Port Charlotte, FL