[stgt] [BUG] Tgt-1.0.8 exited unexpectedly
fujita.tomonori at lab.ntt.co.jp
Sat Oct 2 12:17:27 CEST 2010
On Sat, 02 Oct 2010 07:05:06 +0900 (JST)
Hirokazu Takahashi <taka at valinux.co.jp> wrote:
> > > > > > I'm not sure the modern SATA disk can detect such failure.
> > > > >
> > > > > I think the modern SATA disk has this feature while the IDE disk doesn't
> > > > > have.
> > > >
> > > > Do you have any pointer?
> > >
> > > This may help you:
> > > http://www.seagate.com/content/pdf/whitepaper/SerialATA_comparison_UATA_Technology.pdf
> > > It says serial ATA adds 32-bit CRC error correction for all bits transmitted,
> > > as opposed to only data packets in Ultra ATA.
> > > And it is known that each sector of modern disks has extra bits for ECCs to
> > > correct errors.
> > Hmm, this isn't same as what SCSI DIF (and enterprise storage) does to
> > prevent silient data corruption. This handles only transmission
> > corruption. So there is still a good chance that silient data
> > corruption could happen.
> > SCSI DIF and enterprise storage maintain extra bytes per sector for
> > checksumming to prevent silient data corruption.
> I guess SCSI DIF is a feature which adds extra bytes to each sector
> and its protocol allows software to control them.
> I think each sector has another extra field which SCSI or SATA drives
> internally use to correct errors.
Can you provide a pointer to the info that SATA drives internally keep
extra bytes per sector for error correction?
That's what I asked you in the previous mail.
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