RE: Joys of spare disks!

I think the overhead related to fixing the bad blocks would be insignificant
compared to the overhead of degraded mode.

Guy

-----Original Message-----
From: linux-raid-owner@vger.kernel.org
[mailto:linux-raid-owner@vger.kernel.org] On Behalf Of Molle Bestefich
Sent: Tuesday, March 01, 2005 10:51 PM
To: linux-raid@vger.kernel.org
Subject: Re: Joys of spare disks!

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?..
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