On Mon, Aug 20, 2012 at 01:48:19PM +0300, Pasi Kärkkäinen wrote:
> On Sun, Aug 19, 2012 at 12:38:43PM -0400, Martin K. Petersen wrote:
> > >>>>> "Pasi" == Pasi Kärkkäinen <pasik@xxxxxx> writes:
> >
> > Pasi> So physically the disk is using 520 bytes/sector (and needs to
> > Pasi> support that), but logically the HBA presents 512 bytes/sector +
> > Pasi> PI.. is that correct?
> >
> > Yep. The beauty of PI is that we can store the extra stuff without
> > having to deal with weird block sizes.
> >
> >
> > Pasi> I guess what I'm asking is: Can I use sg_format to enable
> > Pasi> checksums/protection on any disk that physically supports 520
> > Pasi> bytes/sector, or does the disk need to have special T10 data
> > Pasi> protection support aswell?
> >
> > The disk needs to support T10 PI (PROTECT=1 in the Standard Inquiry VPD
> > page). We don't support driving the HBA in PI mode with a non-PI target.
> >
>
> Btw do you know the current status of T10 PI support in md/dm raid?
> If I understood correctly there's some support for raid0/raid1 implemented..
>
> Are there any docs how to enable/disable/configure T10 PI for md/dm raid?
> Perhaps the <bdev>/integrite/{write_enable|read_verify} work directly for the md/dm device?
>
.. and I probably need to sg_format the backing devices to enable PI before enabling PI for the md/dm device?
-- Pasi
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