On 6/11/07, Mattias Wadenstein [off-list ref] wrote:

Hi *,

Is there way to tell md to be paranoid and verify the parity for raid5/6
on every read? I guess this would come with a (significant) performance
hit, but sometimes that's not a big deal (unlike disks scrambling your
data).

Also, regarding data paranoia, for check/repair of a raid6, is the effort
made to figure out which is the misbehaving participant device, or is
parity just blindly recalculated?

This is something that is not available today, but is something I am
looking to implement.  Especially for the raid6 case where hpa showed
that not only can corruption be detected, it can be corrected.

/Mattias Wadenstein

Dan