topic Re: D-Cache Parity Error in Operating System - HP-UX

D-Cache Parity Error

j773303 — Mon, 24 Nov 2003 03:28:55 GMT

Does anyone has the expericence about below message, it shows in dmesg and syslog.log
LPMC type : D-Cache Parity Error.

Does it hardware problem? how to verity it?
Thanks,

Re: D-Cache Parity Error

Robert-Jan Goossens — Mon, 24 Nov 2003 03:37:04 GMT

Hi,

http://www5.itrc.hp.com/service/cki/docDisplay.do?docLocale=en_US&docId=200000065556468

Regards,
Robert-Jan.

Re: D-Cache Parity Error

j773303 — Mon, 24 Nov 2003 03:44:25 GMT

I can't access that web-site, maybe my userid is not allowd. Could you plesas paste the content here?

Re: D-Cache Parity Error

Robert-Jan Goossens — Mon, 24 Nov 2003 03:46:41 GMT

Document description: Example of LPMC on an HP-UX N-class system
Document id: 3200518051
PROBLEM
An HP-UX N-Class computer experienced an LPMC (Low Priority Machine Check)
and the following information appeared in its sys log:

Entry Type: LPMC Error
Entry logged on Wed Dec 26 05:17:19 2001
Entry id: 0x3c29a3af00000000
Hversion Model: 0X5D3

==================================================================
content edited to comply with ITRC guidelines
HTH,
RJ

Re: D-Cache Parity Error

A. Clay Stephenson — Mon, 24 Nov 2003 10:27:14 GMT

LPMC --> Low Priority Machine Check
D-Cache --> Data (as opposed to instruction) Cache

This is definitely a hardware problem --- but it may not be a problem. This can literally be caused be stray radiation including cosmic radiation. If you see more than one of these over a day or so (unless you are in an environment with high background radiation) then it's time to call your HP Mr. Goodwrench and have him replace a processor board.

Re: D-Cache Parity Error

doug hosking — Tue, 25 Nov 2003 05:47:24 GMT

I agree with Clay. It's usually a sign that your processor board is sick. If these happen with any frequency, it is time to look into replacing the processor board. I assume that you are not having problems with temperature. Something like a broken fan could potentially make these errors more likely.