Messages in this thread | | | Date | Fri, 20 May 2005 15:53:36 -0500 (CDT) | From | Adam Miller <> | Subject | Re: software RAID |
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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/
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