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Re: [dm-devel] Status of dm integrity checksumming features



On Wed, Mar 24, 2010 at 06:39:20PM +0200, Pasi Kärkkäinen wrote:
> Hello,
> 
> What's the current status of Linux device mapper integrity (checksumming) features? 
> 
> iirc bio integrity extensions were integrated into Linux 2.6.27, but those are only
> usable for SCSI disks that provide 520-bytes per sector support and also have the 
> hardware support for verifying the checksums, correct? Or then you need to have a HBA
> or RAID-adapter with integrity support..
> 
> (bio integrity patches: http://kerneltrap.org/mailarchive/linux-kernel/2008/6/7/2056354)
> 
> Is it possible to use 'normal' 512-bytes per sectors disks, and store the checksums
> on them, and calculate/verify the checkcums in software in device mapper.. 
> this obviously gives you a bit less usable space, but would be suitable for sw-raid scenarios. 
> 
> I guess that sounds pretty much like dm-csum:
> https://patchwork.kernel.org/patch/25245/
> 
> What's the status of all this nowadays? 
> 

Any comments about this? 

-- Pasi


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