[stgt] [BUG] Tgt-1.0.8 exited unexpectedly

FUJITA Tomonori fujita.tomonori at lab.ntt.co.jp
Fri Oct 1 11:11:27 CEST 2010

On Fri, 01 Oct 2010 14:19:25 +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 think you can find the details in the specification of serial ATA if you
> have a right to access it.

I heard that SATA committee considered to add something like SCSI DIF
to SATA spec last year. I'm not sure if it was accepted.
To unsubscribe from this list: send the line "unsubscribe stgt" in
the body of a message to majordomo at vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html

More information about the stgt mailing list