Questionable Status

Robin Laing Robin.Laing at drdc-rddc.gc.ca
Fri Oct 2 17:12:30 UTC 2009


Tony Nelson wrote:
> On 09-10-01 09:09:40, Robin Laing wrote:
>> Tony Nelson wrote:
>>> On 09-09-23 09:29:56, Gene Poole wrote:
>>>> I've very recently upgraded 2 of my machines.  One machine was


>>>
>> Will the `smartctl -o on /dev/sdx` (for > each sdx), fix the nonzero 
>> Reallocated_Event_Count issue on RAID arrays in a non-desctructive
>> way? 
> 
> No.  Nor for non-RAID either.  It doesn't "fix" Reallocated_Event_Count
> -- rather, its purpose is to make Reallocated_Event_Count go up faster, 
> in that as soon as a sector starts to go bad it will be reallocated if 
> readable, and the sooner the more likely it is possible.  A non-zero 
> Reallocated_Event_Count is not a problem.  Whatever says it is a 
> problem is the real problem.  Fix that instead.
> 
> Non-zero Current_Pending_Sector is a problem, but RAID should be fixing 
> that already.  I don't know, but I think that enabling Automatic 
> Offline Testing should cause any uncorrectable sectors to be noticed 
> and fixed sooner by RAID.
> 
>>   Do you have to use the /dev/sdx devices or the /dev/md devices?
>  ...
> 
> Automatic Offline Testing must be enabled on an actual ATA hard disk, 
> so no fake disk such as dm or md.  See `man smartctl`.
> 

With the changes, I was shocked to see the error message when I tried a 
live DVD on my laptop.  It would be worthwhile to have a tool for 
testing and possibly fixing the problem in a non-destructive way for 
most users.  I guess it is time for an RFE search.

-- 
Robin Laing




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