Read errors during parity check, but no parity errors found?

[t33j4y]

During the monthly parity check, several disks in the array reached temps of 45-48 degrees due to a malfunctioning fan control (manual).

 

The array threw a number of read errors on one of the disks. I also received a warning mail stating that there were read errors:

Event: unRAID array errors
Subject: Warning [TOWER] - array has errors
Description: Array has 1 disk with read errors
Importance: warning

Disk 5 - ST4000DM000-1F2168_Z3015S7L (sdf) (errors 168)

 

and a mail reporting a SMART issue:

 

Event: unRAID Disk 5 SMART health [187]
Subject: Warning [TOWER] - reported uncorrect is 1
Description: ST4000DM000-1F2168_Z3015S7L (sdf)
Importance: warning

 

The SMART report for disk 5 (attached) now shows 1 error.

 

The parity check has concluded now and states "0 errors" which surprises me.

 

I am no wondering what the next step should be.

 

a. Should I run parity check again now at adequate temps to see if the error reproduces?

b. Should I rush out and buy a replacement disk, pre-clear it and replace the offending disk?

c. Count to 10, calm down and have faith in unRaid when it tells me that there are no parity errors and chalk this one up to temperature induced anomaly?

 

Thanks for any feedback :-)

 

 

 

log.txt

ST4000DM000-1F2168_Z3015S7L-20170903-1302.txt

[JorgeB]

There weree no sync errors because unRAID successfully wrote back the problem sector(s) using the other disks + parity.

 

It does look like a disk problem but it may be OK now, you can confirm by running an extended SMART test.

[t33j4y]

Will do that immediately!

 

Thanks :-)

[t33j4y]

SMART test came back and said "Completed without errors" so I will assume everything is ok :-)

[JorgeB]

OK for now, if there are more problems with that disk on the near future consider replacing, if that error had occurred during the rebuild of another disk there would be some file corruption.

[t33j4y]

Just now, johnnie.black said:

OK for now, if there are more problems with that disk on the near future consider replacing, if that error had occurred during the rebuild of another disk there would be some file corruption.

 

Will certainly keep an eye on it. I would hope that my dual parity would have helped, had the error occurred during a rebuild?

 

Thanks!

[JorgeB]

1 minute ago, t33j4y said:

I would hope that my dual parity would have helped, had the error occurred during a rebuild?

 

Yes, it should.