Mr Roooster <mrrooster%gmail.com@localhost> writes: > The wd driver is retrying, (IIRC it retries 3 times) and suceeding on > the second or 3rd attempt. (See xfer 338, retry 0, followed by a 'soft > error corrected' with the same xfer number 10 seconds later. This is > the retry suceeding). Ah, interesting point. I find this confusing, because I thought an uncorrectable read error would, for disks I've dealt with, cause the sector to be marked as permanently failed and pending reallocation. I also didn't realize that wd(4) would issue aother read when there is a failure, but maybe that's in zfs glue code. > This sits below ZFS and therefore ZFS never sees the error. If the > read failed 3 times you'd probably get a data error in ZFS. That makes sense. >> 5 200 140 yes online positive Reallocated sector count 0 > > I was expecting to see this value greater than 0 if the drive was > failing, is the drive bad or the cabling? Sectors get marked as failed, and then they actually get reallocated when you write. I bet after a dd of /dev/zero that will go up.
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