Re: Driver retries disk errors.

[Rogier Wolff]

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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