Messages in this thread |  | | From | "Cress, Andrew R" <> | Subject | RE: Dying disk and filesystem choice. | Date | Thu, 24 May 2001 10:30:43 -0700 |
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>At 12:19 PM +0200 2001-05-24, Jens Axboe wrote: >>In fact you will typically only see an I/O error if the drive _can't_ >>remap the sector anymore, because it has run out. No point in reporting >>a condition that was recovered. >> >>I'd still say, that if you get bad block errors reported from your disk >>it's long overdue for replacement.
On Thursday, May 24, 2001 11:46 AM, Jonathan Lundell wrote: >This can't be right. It implies that the drive is returning bogus >data with no error indication. Remapping a bad sector is not the same >as recovering it.
The automatic reallocation of bad spots on a drive is safe unless paired with the write cache enabled bit in the disk mode pages (configuration). WCE, in some cases, can cause the write/read to both take place from cache with good status, and if the bad spot is reallocated later, when the cache is flushed, the reporting gets very confusing.
In general: It is a common misconception that if a disk begins to show some bad spots, that it should be replaced. In fact, a disk can have a reliable, useful life for years after bad spots begin to show up. The number of bad spots in the Grown Defect List over a specified time as a % of capacity can be an predictor of impending failure, however.
Andy Cress
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