Could drbd randomly flip bits? Was: Database page corruption on disk occurring during mysqldump on a fresh database and Was: Spontaneous development of supremely large files on different ext3 filesystems
Jeremy Cole
jeremy at provenscaling.com
Mon Sep 17 19:00:29 UTC 2007
Hi Maurice,
Do you mean a Serially-Attached SCSI aka SAS controller, I assume?
Is this a custom build machine or a vendor integrated one?
Regards,
Jeremy
Maurice Volaski wrote:
>> On Sep 17, 2007 13:31 -0400, Maurice Volaski wrote:
>>> In using drbd 8.0.5 recently, I have come across at least two
>>> instances where a bit on disk apparently flipped spontaneously in the
>>> ext3 metadata on volumes running on top of drbd.
>>>
>>> Also, I have been seeing regular corruption of a mysql database,
>>> which runs on top of drbd, and when I reported this as a bug since I
>>> also recently upgraded mysql versions, they question whether drbd
>>> could be responsible!
>> Seems unlikely - more likely to be RAM or similar (would include cable
>> for PATA/SCSI but that is less likely an issue for SATA).
>>
>
> Shouldn't trip the ECC and produce machine check exceptions and ones
> that were unrecoverable?
>
> The disks are part of hardware RAID with a SATA II cableless
> backplane and SATA-SCSI controller, so there is a SCSI cable and SCSI
> HBA (LSI Logic).
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