[Beowulf] Node Drop-Off
twm at tcg-hsv.com
Mon Dec 4 07:15:34 PST 2006
Update to node drop-off:
I wrote a few weeks ago to ask about node drop-off. A quick note...I
had a cluster run for 3 years without failure and I upgraded the Opteron
240 CPUs to 250s. The upgrade required a BIOS upgrade and while I was
at it, upgraded the OS and security. Some readers provided good
suggestions for diagnosis. As it turned out, of the 16 CPU batch...two
were flawed. No success was derived from replacing power supplies, HDD,
resetting memory and the cooling solution. The CPU flaw only manifested
itself (at first) after several hours of CPU usage. With each failure,
the time duration shortened before the next failure and by the time I
figured it out was down to about 2 minutes.
The AMD engineer with whom I talked was amazed that such CPUs made it
beyond quality control. He also suggested that the vendor may have
inadvertently mixed returned (previously fetermined to be flawed
processors) with the new ones and sent them out (again) as new.
Just for future reference...is there an easy way to determine if a CPU
is flawed with 2 weeks of down time and extensive hair extraction????
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