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    SubjectRe: software RAID
    Yes, I want to know if the bad sector on disk A will be reallocated
    when disk B tries to write to disk A.


    On Fri, 20 May 2005, Grzegorz Kulewski wrote:

    > On Fri, 20 May 2005, Lennart Sorensen wrote:
    >> On Fri, May 20, 2005 at 12:56:13PM -0500, Adam Miller wrote:
    >>> We're looking to set up either software RAID 1 or RAID 10 using 2 SATA
    >>> disks. If a disk in drive A has a bad sector, can it be setup so that the
    >>> array will read the sector from drive B and then have it rewrite the
    >>> bad sector on drive A? Please CC me in the response.
    >> If a harddisk has a bad sector that is visible to the user (and hence
    >> not remapped by the drive) then it is time to retire the drive since it
    >> is out of spares and very damaged by that point.
    >> If you have a bad sector, it doesn't go away by writing to it again. On
    >> modern drives, if you see bad sectors the disk is just about dead, and
    >> will probably be seen as such by the raid system which will then stop
    >> using the disk entirely and expect you to replace it ASAP.
    > What do you mean "see bad sectors"?
    > Modern drives are trying to relocate sectors that can become bad in short
    > time. But this does not work 100% reliably. And sometimes disk wants to
    > relocate sector but the sector can not be read anymore. If this happens disk
    > will return read error when reading the sector _but_ when you will write it
    > again it will relocate it (with new data). And I think this was the idea
    > behind first post... To allow disk A to relocate not readable sectors with
    > correct data from disk B.
    > Grzegorz Kulewski
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