Re: MD/RAID: what's wrong with sector 1953519935?

[Ric Wheeler]

On 08/25/2009 11:45 PM, Andrei Tanas wrote:
> > > > I would suggest that Andrei might try to write and clear the IO
> > > >          
> > error
> >      
> > > > at that
> > > > offset. You can use Mark Lord's hdparm to clear a specific sector or
> > > > just do the
> > > > math (carefully!) and dd over it. It the write succeeds (without
> > > > bumping your
> > > > remapped sectors count) this is a likely match to this problem,
> > > >          
> > > I've tried dd multiple times, it always succeeds, and the relocated
> > >        
> > sector
> >      
> > > count is currently 1 on this drive, even though this particular fault
> > > happened at least 3 times so far.
> > >
> > >        
> > I would bump that count way up (say to 2) and see if you have an
> > issue...
> >      
> Not sure what you mean by this: how can I artificially bump the relocated
> sector count?
>
>    
Sorry - you need to set the tunable:

/sys/block/mdX/md/safe_mode_delay

to something like "2" to prevent that sector from being a hotspot...

ric




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