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

[Maurice Volaski <mvolaski aecom yu edu>]

> 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).
--

Maurice Volaski, mvolaski aecom yu edu
Computing Support, Rose F. Kennedy Center
Albert Einstein College of Medicine of Yeshiva University