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LPMC Cache Parity Errors

Ralph Grothe
Honored Contributor

LPMC Cache Parity Errors


in syslog.log I got these irritating entries.

# grep LPMC /var/adm/syslog/syslog.log
Nov 19 05:55:48 jupiter vmunix: LPMC type : I-Cache Parity Error.
Nov 22 18:42:35 jupiter vmunix: LPMC type : D-Cache Parity Error.

Machine/OS is

# model;uname -srv
HP-UX B.11.00 U

In ITRC KB I found this doc that quotes the same sort of error message.


The assessment is somewhat daunting.

Attached you may find the dump from

echo "sc product cpu;info;wait;il"|cstm

Anyone CSTM dump conversant who could advise me if there is action needed (e.g. replacement of a CPU)?

Madness, thy name is system administration
Steven E. Protter
Exalted Contributor

Re: LPMC Cache Parity Errors


Luckily it wasn't HPMC which is instant crash. Sometimes LPMC leads to HPMC

I'd actually go a with xstm or mstm here. If there are errors or warnings thats enough to get the hardware folks out to replace parts.

With xstm under X, one of my few favored GUI tools you just click on the cpu and run the command excercize. If its not green, you push hardware to replace it.

Steven E Protter
Owner of ISN Corporation
Sponsor: http://hpux.ws
Twitter: http://twitter.com/hpuxlinux
Founder http://newdatacloud.com
Robert-Jan Goossens
Honored Contributor

Re: LPMC Cache Parity Errors

Bill Hassell
Honored Contributor

Re: LPMC Cache Parity Errors

These are called low-priority errors because the hardware corrected the single bit errors. However, if one bit is bad, more will often follow and eventually they become uncorrectable errors. When that happens, the system WILL crash. So consider LPMC's as early wearnings about pending failiures. NOTE: if only one or two messages have occurred in the last few months, don't worry about it. But if you have had several in a day or two, schedule a service call and get the problem processor replaced. The cstm logfile seems to have a number of potential problems logged.

Bill Hassell, sysadmin
Ralph Grothe
Honored Contributor

Re: LPMC Cache Parity Errors

Hi Steven,

I started up xstm.
Way too much slidebar scrolling for my taste (we have quite a few SAN disks attached to the box that results in an inferior device display)
I did as you suggested, marked a CPU and clicked on exercise->run.
Only then did I realize that those execrcises could impair current performance.
Anyway, too late, the exercise ran a few minutes while the symbols' background colour changed from grey, over olive, to bright green.
As it turned out all execrcises perfomed successfully on all CPUs.
So still any need to bother HPs' HW folks?
Madness, thy name is system administration
Geoff Wild
Honored Contributor

Re: LPMC Cache Parity Errors

It is my understanding that LPMC D-Cache Parity Error are memory related - not CPU...

LPMC is a Low Priority Machine Check which means that the hardware fixed it's own problem.

Possibly a RAM module has gone completely bad.

My advice is to get HP called out to check the memory configuration of the system. Show/tell them the syslog messages when you log the call.

Proverbs 3:5,6 Trust in the Lord with all your heart and lean not on your own understanding; in all your ways acknowledge him, and he will make all your paths straight.