RE: Spares and partitioning huge disks

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@vger.kernel.org
[mailto:linux-raid-owner@vger.kernel.org] On Behalf Of Michael Tokarev
Sent: Sunday, January 09, 2005 1:00 PM
To: linux-raid@vger.kernel.org
Subject: Re: Spares and partitioning huge disks

Peter T. Breuer wrote:

Michael Tokarev [off-list ref] wrote:

quoted

I think all modern drives support bad block remapping on both read and

write.

quoted

But think about it: if there's a read error, it means the drive CAN NOT

read

quoted

the "right" data for some reason (for some definition of "right" anyway)

--

quoted

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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