On 2013-11-04, Phil Turmel [off-list ref] wrote:

Make sure you also have a "check" scrub in a cron job for everything
greater than raid0.  (Interval can vary--I use weekly.)  And follow up
on the cron job with a report of all mismatch-cnt values.

RHEL/CentOS already has a script which does this; IIRC it emails root if
mismatch_cnt is nonzero after the check is complete.

For large capacities with consumer drives (~8TB or more, IMHO), you
should seriously consider raid6.

I'm assuming you mean arrays larger than 8TB, not individual drives!  :)
I have had a second drive fail in a large array after the first one
failed and a rebuild started, so this isn't just a theoretical
discussion.

--keith


--  
kkeller@wombat.san-francisco.ca.us