Re: Driver retries disk errors.
From: Robert Hancock
Date: Mon Aug 30 2004 - 22:13:54 EST
Quite likely, in that case the drive has exhausted its spare pool, and there
are a bunch of bad sectors that have already been reallocated. Some drives
will reallocate sectors if they are still readable but the sector appears to
be marginal.
----- Original Message -----
From: "Rogier Wolff" <R.E.Wolff@xxxxxxxxxxxxxxxxxxxx>
Newsgroups: fa.linux.kernel
To: "Theodore Ts'o" <tytso@xxxxxxx>; <linux-kernel@xxxxxxxxxxxxxxx>;
<linux-ide@xxxxxxxxxxxxxxx>
Sent: Monday, August 30, 2004 4:19 PM
Subject: Re: Driver retries disk errors.
On Mon, Aug 30, 2004 at 01:46:32PM -0400, Theodore Ts'o wrote:
> a filesystem: if we recover one block this way, the next block will be
> errorred and the filesystem "crashes" anyway. In fact this behaviour
> may masquerade the first warnings that something is going wrong....
If the block gets successfully read after 2 or 3 tries, it might be a
good idea for the kernel to automatically do a forced rewrite of the
block, which should cause the disk to do its own disk block
sparing/reassignment.
Hi Ted,
I agree that this is the theory. In practise however, I've never
seen it work correctly. We've seen several disks with say 1-5 bad
blocks and nothing else, and "dd if=/dev/zero of=/dev/<disk>" doesn't
seem to cure them.
Roger.
--
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