He needs to run a full offline or long test before checking with
smartctl -a -- since it won't show any sector errors if those tests
weren't run at least once.

On Thu, Jan 21, 2010 at 1:25 AM, Brett Russ [off-list ref] wrote:

On 01/20/2010 03:44 PM, Majed B. wrote:

quoted

You can find details on these parameters and their values in md's
documentation: http://www.mjmwired.net/kernel/Documentation/md.txt

A mismatch count can be checked by writing "check" to the proper file
as stated in line 376:
http://www.mjmwired.net/kernel/Documentation/md.txt#376

Sounds like Jon may have a flaky HDD if certain members continually throw
errors.  Jon, can you check SMART stats on your drives?

for di in a b c d e f g; do smartctl -a /dev/sd$di | grep -i _sect; done

you may have to add another option to smartctl, I forget.

-BR

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       Majed B.
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