On Wed, Jul 15, 2009 at 07:14:40PM -0700, mala...@us.ibm.com wrote:
> Seems to be a well known problem with iSCSI data digests and mirrored devices.
> See this (iscsi issue):
> http://thread.gmane.org/gmane.linux.iscsi.open-iscsi/2670/focus=48961
> or  (dm-raid1 issue)  
> http://thread.gmane.org/gmane.linux.kernel.device-mapper.devel/5392

That clearly looks like it.

Ouch.  Looks very difficult to fix without copy the page data before
transmission/checksumming. :-(  I'll do more more reading.

Thanks again,


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