Re: DIF/DIX updates for 2.6.32

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On 08/26/2009 09:17 AM, Martin K. Petersen wrote:
> Updates to the DIF/DIX code for 2.6.32:
> 
>  - Add support for 32-byte CDBs to SCSI layer
> 
>  - Deprecate the DIX CONVERT ops
> 
>  - Detach pure DIF support from CONFIG_BLK_DEV_INTEGRITY
> 
>  - Add support for DIF Type 2 devices in sd
> 
>  - Add DIF Type 2 support to scsi_debug
> 

Hi Martin.

I have not followed your work very closely so please forgive me if
I'm asking dumb questions. I've meant to be asking you about something
for a while.

With an sd disk supporting DIF/DIX, do you have this problems?
http://thread.gmane.org/gmane.linux.kernel.device-mapper.devel/5392
[Desynchronizing dm-raid1]

I know that we also have the above problem with iscsi and data-digest
such that when we come to sign the data it might change on us before
the target receives it.

(Personally I'm working on a Mirror system over osd's and will have to
 test for this problem as well. I anticipate a need to copy the data
 before submission like the dm-raid1 does)

Best regards
Boaz
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