From mboxrd@z Thu Jan  1 00:00:00 1970
From: Molle Bestefich <molle.bestefich@gmail.com>
Subject: Re: Joys of spare disks!
Date: Wed, 2 Mar 2005 04:50:35 +0100
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Robin Bowes wrote:
> I envisage something like:
> 
> md attempts read
> one disk/partition fails with a bad block
> md re-calculates correct data from other disks
> md writes correct data to "bad" disk
>   - disk will re-locate the bad block

Probably not that simple, since some times multiple blocks will go
bad, and you wouldn't want the entire system to come to a screeching
halt whenever that happens.

A more consistent and risk-free way of doing it would probably be to
do the above partial resync in a background thread or so?..