lkml.org 
[lkml]   [2005]   [May]   [20]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    Date
    From
    SubjectRe: software RAID
    Hi,
    Yes, I want to know if the bad sector on disk A will be reallocated
    when disk B tries to write to disk A.

    Adam

    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
    >
    -
    To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
    the body of a message to majordomo@vger.kernel.org
    More majordomo info at http://vger.kernel.org/majordomo-info.html
    Please read the FAQ at http://www.tux.org/lkml/

    \
     
     \ /
      Last update: 2005-05-20 22:57    [W:0.052 / U:238.616 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site