Re: "One or more disks are failing" ?

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On Sat, Jul 04, 2009 at 13:42:16 +0300,
  Jussi Lehtola <[email protected]> wrote:
> On Sat, 2009-07-04 at 02:57 -0700, Scott Beamer wrote:
> >   5 Reallocated_Sector_Ct   0x0033   100   100   010    Pre-fail  Always
> >       -       4
> This means your disk is breaking down, and should be replaced soon.

It means some problem sectors have been reallocated. This correlates with
disk failure and depending on how rich you are might signal that it's
time to replace the disk.

> > 197 Current_Pending_Sector  0x0012   100   100   000    Old_age   Always
> >       -       2
> > 198 Offline_Uncorrectable   0x0030   100   100   000    Old_age
> > Offline      -       1
> And these IIRC mean that you've already lost some data. Replace the disk

No, it means that there are problem sectors that can't be read. If you write
over these sectors they may or may not see them get remapped. Disks
generally won't remap sectors which it can't read to give you a chance to
try to read them some more. It's possible to have one time problems with
a sector, so they may not even get remapped to a spare once you overwrite
the data or get a good read.

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