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тАО02-17-2003 09:47 AM
тАО02-17-2003 09:47 AM
Memory Event Type : Single bit error (SBE) event. A correctable single
bit error has been detected and logged.
Is this a HW error on dimm?
Please send me information about it?
Thanks.
Solved! Go to Solution.
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тАО02-17-2003 09:49 AM
тАО02-17-2003 09:49 AM
Re: single bit error
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тАО02-17-2003 09:55 AM
тАО02-17-2003 09:55 AM
SolutionAlthough the single bit errors are being corrected, it may be advisable to
evaluate whether the system should be rebooted. Rebooting the system will
allow the memory page to be deallocated so it is no longer referenced. If
an excessive rate of single bit errors occur, an event with higher severity
will be generated.
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тАО02-17-2003 10:05 AM
тАО02-17-2003 10:05 AM
Re: single bit error
You can track memory errors this way:
# echo "selclass qualifier memory;info;wait;infolog" | cstm > /tmp/meminfo
Regards!
...JRF...
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тАО02-17-2003 10:06 AM
тАО02-17-2003 10:06 AM
Re: single bit error
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тАО02-17-2003 01:34 PM
тАО02-17-2003 01:34 PM
Re: single bit error
It should tell you about the treshold. How many of these events are received & thier frequency is important.
How's the system memory modules layout, it is very important to have RAM fill in 1st slots 1st (also Memory like even numbers), you can chek RAM layout with:
# cstm --> map --> sel dev memory# --> info --> infolog --> look at Memory layout 0a/0b 1a/1b so forth..
For example, you don't want to see 0a/0b with 256MB & 1a/1b with 512MB this config is out-of-specs.
Cheers,
PAP! (a.k.a. Pliz Assign Points)
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тАО02-18-2003 01:46 AM
тАО02-18-2003 01:46 AM
Re: single bit error
If this error has just come once then I will not worry much.
hope this helps..
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тАО02-18-2003 09:05 AM
тАО02-18-2003 09:05 AM
Re: single bit error
The Processor Dependant Code on your machine may differ from our L-Class machines. But this PDC has a utility to examine the RAM layout. This will say which slots has HP Ram, and which is from another manufacturer. From your error message, you should be able to locate which slot has the DIMM with the bad memory, and this PDC utility will tell you who made it. If its HP Ram, and the system is in warranty and/or under service contract, HP will take care of it.
DataRam was very good about honoring their lifetime warranty. They need the stock keeping code off of the DIMM itself, but once they have it, they will cross-ship you a new DIMM overnight. You have to return the bad DIMM to them within 10 days or so, or they'll send you a bill. But their service is just great. You just need to tell them that the DIMM was de-allocated due to excessive SBE's.
Anyway--let us know how it turns out for you.
Chris
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тАО06-27-2003 07:30 AM
тАО06-27-2003 07:30 AM
Re: single bit error
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тАО06-30-2003 04:39 AM
тАО06-30-2003 04:39 AM
Re: single bit error
Single bit errors are not cleared from the PDT (Page Deallocation Table) by a reboot.
When a single bit error occurs, the corresponding memory page is entered into the PDT and deallocated from the system. Sometimes this deallocation is not possible - for example in case the kernel has a lock on this page that cannot be removed - but a reboot can resolve this.
Pages entered in the PDT will no longer be used - this is OK and no problem (because the pages are very small) - it is the sense of the PDT!
Only in case you have lots of pages of one DIMM pair (e.g. 0a/b) in the PDT you should consider to replace this DIMM pair (or single DIMM, depending on the type of server you have).
The HP technician then clears the PDT. All defect pages then of course will be re-entered by the system due to new errors, but the new DIMMS will be fully used until new errors occur.
I hope this answered your question. Or where else did you want to clear the single bit errors?
Cheers!