RE: Spares and partitioning huge disks

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It is on Neil's wish list (or to do list)!  Mine too!

>From Neil Brown:

http://marc.theaimsgroup.com/?l=linux-raid&m=110055742813074&w=2

Guy


-----Original Message-----
From: linux-raid-owner@xxxxxxxxxxxxxxx
[mailto:linux-raid-owner@xxxxxxxxxxxxxxx] On Behalf Of Michael Tokarev
Sent: Sunday, January 09, 2005 1:00 PM
To: linux-raid@xxxxxxxxxxxxxxx
Subject: Re: Spares and partitioning huge disks

Peter T. Breuer wrote:
> Michael Tokarev <mjt@xxxxxxxxxx> wrote:
> 
>>I think all modern drives support bad block remapping on both read and
write.
>>But think about it: if there's a read error, it means the drive CAN NOT
read
>>the "right" data for some reason (for some definition of "right" anyway)
--
>>ie, the drive "knows" there's some problem with the data and it can't
> 
> I really don't want RAID to fault the disk offline in this case.  I want
> RAID to read from the other disk(s) instead, and rewrite the data on the
> disk that gave the fail notice on that sector, and if that gives no error,
> then just carry on and be happy ...

There where some patches posted to this list some time ago that tries to
do just that (or a discussion.. i don't remember).  Yes, md code currently
doesn't do such things, and fails a drive after the first error -- it's
the simplest way to go ;)

/mjt
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