[CentOS] Disk error

On 1/7/2013 3:43 PM, Mark LaPierre wrote:
> 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?

is this disk part of an mdraid mirror by any chance? 
/etc/cron.weekly/99raid-check does a synccheck of each md metadevice.