[DRBD-user] Re: 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 21:00:29 CEST 2007

Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.

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?



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).

high performance mysql consulting

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