On Sun, 5 Dec 1999, Robert Dinse wrote:
> On Sun, 5 Dec 1999, Mr. James W. Laferriere wrote:
> > Hello Robert, I tried an grunt experiment . I put Two Ross
> > HyperSparc Dual 66Mhz cpu's in my sparc20 chassis & attempted
> > to install RH-6.1 on the system . After several lock ups ,
> > and just plain funky behaviour (ie: key presses mis-interpreted) .
> > I opened the case and removed the cpu's emmediately after power
> > off , they were almost to hot to handle as a rough guess approx.
> > 125 Deg. F. Now in my book this is way to hot for a cpu to be
> > and would definately cause the flaky behaviour I (& maybe you)
> > were seeing . I will later attempt to add some additional fans
> > to the case & see if the added airflow helps .
> > When I popped these out I dropped back in an old set of Ross
> > 40Mhz Dual cpu's & started the process over , So far nothing
> > ill has happened . Hth, JimL
> I am sure that's not the issue. The reason I say this is that
>SunOS 4.1.4
> will run for months without a crash on the same hardware.
I am not so sure this is a fair comparison . The reason I am
saying this is (a while back) someone had mentioned that some
instructions can have the cpu generate more heat . But, I never
did hear of any proof of the concept .
Now this is in a sparc20 chassis right ?
> My main shell server here is a SunOS 4.1.4 machine on the same hardware
> except that it's also got a FDDI card in the box generating additional
>heat and
> if I don't have to boot it for some other reason it will generally go
>about six
> weeks between crashes.
Hmmm, this still smells of something wrong . & probably with
the cpu's . IF you have put other cpu types in & the difficulties
diminished or completely went away or were differant .
Fyi, sbus option cards don't put more heat on the cpu's in a
sparc20 chassis . The airflow is from power supply toward the
option cards . Thus the power supply gets the coolest air then
the cpu's then the sbus cards . But they (of course) do draw
more current . Which is another item I am worried about in the
sparc20 chassis is max. current draw at rated voltage . Which
if the voltage drops will cause more heat in the system .
> For what it may or may not be worth, I don't have drives in this box so
> there isn't that source of heat, just the CPU's, memory, etc.
I had just the one 4GB IBM sca (dchs04y) , which was warm but
nowhere near as warm as th cpu's . Mine was configured as such
2) Ross Hyper-sparc 66Mhz cpu's
4) Dram simms totaling 128MB
1) Vsimm 8Mb
0) sbus options
1) 4GB IBM sca (dchs04y) HD.
1) sun 1.44 floppy .
Now I have the slower Ross cpu's in the chassis & no more heat
problems air flowing out is temp nominal (afaict) , & the install
is continuing un-eventful . Twyl, JimL
+----------------------------------------------------------------+
| James W. Laferriere | System Techniques | Give me VMS |
| Network Engineer | 25416 22nd So | Give me Linux |
| babydr@baby-dragons.com | DesMoines WA 98198 | only on AXP |
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