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

Ric Wheeler
2009-08-26T10:34:29Z

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