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Re: ZFS RAIDZ2 and wd uncorrectable data error - why does ZFS not notice the hardware error?



Hi,

On 16.07.21 23:21, RVP wrote:
On Fri, 16 Jul 2021, Matthias Petermann wrote:

I will overwrite the disk with zeros once as a test. According to the S.M.A.R.T. values, the number of "pending" sectors has already decreased - from 18 to 15.

```
197 200    0     no  online  positive    Current pending sector      15
```


I would replace that drive, mate. 18 bad sectors on a fairly new drive
(some propagated all the way up to the OS) is a bit worrisome...


After overwriting the whole drive with zeros, there are no pending sectors anymore:

```
saturn$ doas atactl wd2 smart status
SMART supported, SMART enabled
id value thresh crit collect reliability description                 raw
  1 197   51     yes online  positive    Raw read error rate         39550
  3 176   21     yes online  positive    Spin-up time                6158
  4 100    0     no  online  positive    Start/stop count            510
  5 200  140     yes online  positive    Reallocated sector count    0
  7 200    0     no  online  positive    Seek error rate             0
  9  64    0     no  online  positive    Power-on hours count        26807
 10 100    0     no  online  positive    Spin retry count            0
 11 100    0     no  online  positive    Calibration retry count     0
 12 100    0     no  online  positive    Device power cycle count    506
192 200    0     no  online  positive    Power-off retract count     99
193 200    0     no  online  positive    Load cycle count            2679
194 118    0     no  online  positive    Temperature                 32
196 200    0     no  online  positive    Reallocated event count     0
197 200    0     no  online  positive    Current pending sector      0
198 100    0     no  offline positive    Offline uncorrectable       0
199 200    0     no  online  positive    Ultra DMA CRC error count   0
200 100    0     no  offline positive    Write error rate            0
```

This reflects exactly what Greg mentioned and it is good to know.

Of course, I don't trust this drive anymore and will replace it.

Kind regards
Matthias

Attachment: smime.p7s
Description: S/MIME Cryptographic Signature



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