RAID rebuild

RAID rebuild

Posted Jun 20, 2009 21:29 UTC (Sat) by anton (guest, #25547)
In reply to: RAID rebuild by rbuchmann
Parent article: What ever happened to chunkfs?

With magnetic disk drives it's not uncommon that a read error (marking a disk as faulty) will go away after a write (due to sector reallocation).

That's the theory, and it's quite plausible, if there are spare blocks on the disk, but I have seen several drives (from different manufacturers) with read errors that were also write errors, and none where the error went away by writing. And it's not that these drives had run out of spare blocks or something; the errors apparently were caused by the head running amok in unusual power supply conditions.

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