On Wednesday January 18, [email protected] wrote:
> Helge Hafting wrote:
> >
> > As other have showed - "mdadm" can reassemble your
> > broken raid - and it'll work well in those cases where
> > the underlying drives indeed are ok. It will fail
> > spectacularly if you have a real double fault though,
> > but then nothing short of raid-6 can save you.
>
> No, actually there are several things we *could* do,
> if only the will-to-do-so existed.
You not only need the will. You also need the ability and the time,
and the three must be combined into the one person...
>
> For example, one bad sector on a drive doesn't mean that
> the entire drive has failed. It just means that one 512-byte
> chunk of the drive has failed.
>
> We could rewrite the failed area of the drive, allowing the
> onboard firmware to repair the fault internally, likely by
> remapping physical sectors. This is nothing unusual, as all
> drives these days ship from the factory with many bad sectors
> that have already been remapped to "fix" them. One or two
> more in the field is no reason to toss a perfectly good drive.
Very recent 2.6 kernels do exactly this. They don't drop a drive on a
read error, only on a write error. On a read error they generate the
data from elsewhere and schedule a write, then a re-read.
NeilBrown
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