Thanks to:
Kevin Jones <kevin.jones_at_hamilton.co.uk>
"Dr. Tom Blinn, 603-884-0646" <tpb_at_doctor.zk3.dec.com>
"William H. Magill" <magill_at_isc.upenn.edu>
To summarize it looks like the CPU in slot 0 will determine the speed at which
the second processor will function. The only known side effect of this at
this point is heat which does not seem to be a problem when only jumping
50Mhz. Other than that it sounds like other systems (ie not 2X00) have
problems when operating CPU's of different rev levels let alone different
speeds. In other words *Beware*. As noted by many people, this is *not* a
supported "feature" even though it's documented so do it at your own risk if
you must.
Thanks,
Trevor
Original Message:
Hi Managers,
Since February 21st of this year we have had a 2100A running with a 5/
300 in slot 0 and a 5/250 in slot 1. This all came about when I read in
the 4.0D documentation under System and Network Management Documentation,
System Configuration and Tuning, Section 3.1 paragraph 2:
> A system must be able to efficiently allocate the available CPU cycles
> among competing processes. In addition to single-CPU systems, DIGITAL
> supports multiprocessing systems and processors with different speeds.
After pondering the above I tried it. As long as the fastest processor is in
slot 0 it works flawlessly. Note that both CPU's are ev5, I don't think it
would work with an ev5 and an ev4 CPU.
Anyways, after installing the CPU I booted the server and it noted that cpu1
was a 250Mhz on system boot but anytime after that it sees two 300Mhz CPUs.
I've monitored the system with Digitals monitor and it shows both CPU's being
utilized. We've stress tested the system and everything works flawlessly,
it's been up since the 21st of February.
Dec says it definitely does not work and they will not support it. A service
rep said he seemed to remember them saying something about the fastest
processor being in slot 0 but he wouldn't recommend it. Does anyone else out
there have this running or has anyone played with it?
Thanks,
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Trevor Stott Trevor.Stott_at_sheridanc.on.ca
Information Technology
Sheridan College Phone: (905) 845-9430 ext. 2148
Oakville, Ontario, Canada Fax: (905) 815-4011
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"Every time I think I know where it's at, they move it."
Received on Thu Mar 18 1999 - 20:11:53 NZDT