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SubjectRe: Huge uptimes & cosmic rays
Date
Hi,

> I hear here voices about huge uptimes... Well.
>
> There was some research project, which included _long_
> computation. SOmething like year or so. Long enough to worry about
> machine failures. Two machines were set up, checking each other. It
> was predicted that during that year, two failures will occur. They
> occured - computers gave two bad results in one year.
>
> Huge amount of memory & huge uptime is calling for trouble: remember
> that once or twice a year, random bit in your machine is selected &
> toggled. If it hits kernel or libc or long-lived daemon...

Try reasonable hardware:

Jun 27 21:47:57 2A:linus unix: Recoverable memory parity error detected by CPU a
t 0xb9bb238 <0x340> code:30
Jun 27 21:47:57 2A:linus unix: Memory Parity Error in SIMM S7
Jun 27 21:47:57 2A:linus unix: Recoverable memory parity error detected by CPU a
t 0xb9bb238 <0x380> code:30
Jun 27 21:47:57 2A:linus unix: Memory Parity Error in SIMM S7
Jun 27 21:47:57 2A:linus unix: Recoverable memory parity error corrected by CPU
at 0xb9bb238 <0x380> code:30
Jun 27 21:47:57 2A:linus unix: Memory Parity Error in SIMM S7

Which is also why the "developers" of those parity generator SIMMs should
be be paid back their school money. Above machine linus.linux.sgi.com,
is still up, btw.

Ralf

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