[CentOS] ECC RAM Error
John R Pierce
pierce at hogranch.com
Thu Oct 11 20:47:59 UTC 2007
Peter Arremann wrote:
> On Thursday 11 October 2007, John R Pierce wrote:
>> Peter Arremann wrote:
>>> On Thursday 11 October 2007, Centos wrote:
>>>> The ECC errors only happens when I am transferring data from other
>>>> storage to this one that we get error.
>>>> it only happens when it is writing data to it.
>> What do you mean by "transferring data from other storage to this one"
>> ? These are main memory (RAM) ECC errors and have nothing to do with
>> disk storage, networking, or anything else.
>> and, 'writing data to it', its not clear what the 'it' is referring to.
> Storage - anything that can store data. ECC is a generic term and covers all
> kinds of checksumming algorithms. I was talking pretty generic - don't care
> if ram, caches, nand-flash, ficon or anything else.
> I was trying to get across that its hard to pinpoint where your bits flipped -
> in the storage device, on the transmission there or back.
if they flipped in a disk storage device, you would have gotten a disk
storage related error, typically reported as a "CRC" error even tho
modern disks haven't actually used CRC since the 80s.
systems don't tend to transmit and store the ECC across different device
if they had been read off the disk in a 'flipped' state, then they would
have been written to RAM just as they were read, and the RAM would have
created its own ECC on the 'wrong' data quite happily.
anyways, the error in question...
> : EXCEPTION: ECC Error Interrupt (Two or more Bit Error)
> 0C18:00020001 0C68:00000000 Lcause:74630001 Lerr:1C855F82
is almost certainly a RAM ECC error, so I was asking the original poster
just what he meant by 'transferring data from other storage to this one'
as it sounded like he was thinking in terms of overall server operation
rather than the specific component level.
if he was talking about copying files from one disk to another, then
that data has to be read from the source disk and written into ram, then
read back from ram and written to the other device. in fact, its
possibly been copied a few times in ram in the process too, so talking
about transfering between storage really isn't very helpful here.
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