On 01/07/2013 04:19 PM, John R Pierce wrote: > 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. It is a raid drive and there a "read-check" file in /etc/cron.d. It is set to run raid-check at 1:00 AM on Sunday. So I ran raid-check on the commend line, and sure enough the disk errors show up in syslog. I'll replace the drive, then run some long tests on it out of the system. Thanks for the suggestions! Emmett