[CentOS] Disk error

[Mark LaPierre]

On 01/07/2013 06:24 PM, Brian Mathis wrote:
> On Mon, Jan 7, 2013 at 5:58 PM, Emmett Culley<emmett at webengineer.com>  wrote:
>> For some time I have been seeing disk errors in the syslog every seven days.  Until today it always happens Sunday morning at 8:13 AM, plus or minus a minute or two.  Yesterday it happened at 1:13 AM.  Here are the pertinent log entries for the latest occurrence:
> [...]
>> Jan  6 01:13:25 g2 kernel:         res 51/40:00:db:bf:d6/40:00:04:00:00/00 Emask 0x9 (media error)
> [...]
>> Jan  6 01:13:25 g2 kernel: sd 8:0:0:0: [sdg] Add. Sense: Unrecovered read error - auto reallocate failed
> [...]
>>
>> There is nothing in /etc/cron.weekly, nor are there any root crontab entries.  Any suggestions for investigating this issue would be much appreciated.
>>
>> Emmett
>>
>
>
> Based on this I'd say your disk is going bad, and has run out of spare sectors:
>      Jan  6 01:13:25 g2 kernel: sd 8:0:0:0: [sdg] Add. Sense:
>      Unrecovered read error - auto reallocate failed
>
> You can use smartctl to get some information from the SMART tables,
> but I've never been able to get a conclusive test out of the testing
> options.  It would be a good idea to run 'badblocks' against the drive
> as well, as it will definitely tell you if there are bad sectors.
>
> Disks are so cheap it's usually not worth too much effort or delay
> once you've found out that it's bad.
>
>
> ❧ Brian Mathis

How do you explain the regular timing of the errors?  Is there a 
process, maybe a backup or something, that runs at this time every 
Sunday morning Mr. Mathis?


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