Re: [BUG] Tgt-1.0.8 exited unexpectedly

[FUJITA Tomonori <fujita.tomonori@xxxxxxxxxxxxx>]

On Fri, 01 Oct 2010 14:19:25 +0900 (JST)
Hirokazu Takahashi <taka@xxxxxxxxxxxxx> 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.
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