netbsd and RAID and UCR errors on large drives

[Thilo Jeremias <thilo%nispuk.com@localhost>]

Gents,

I'm wondering about the algorithm that is implemented in netbsd.
I believe that the most common errors for large drives are single read 
failures,
those errors should be (IMHO) recoverable in a raid set by re-writing 
the failing blocks
from a working drive.

Discussions suggest, that the non decreasing error rate for drives, will 
cause in a couple of years (assuming constant capacity increase),
a guaranteed UCR while rebuilding a raid system, so the suggestion is to 
use RAID6 to allow for that.

As I said above some drive failures should be avoidable w/o raid6 and 
I'm wondering if
netbsd does (or will) implement such a single block recovery ?

Is there another interface into the smart error list than smartctl ?

Anyone knows about that?

ta
thilo