Some hard disk is reporting health problems. Now what?

[Kevin O'Gorman]

Running Natty desktop, using it partly as a server, with a lot of disks
(10-12, depending) and even more partitions,
I am for the first time seeing this dialog box: "Hard Disk Problems
Detected. A hard disk is reporting health problems. "
The "Examine" button takes me to a window showing all disks and partitions,
but I don't see any way to determine
which is the one failing.  (I'm kind of hoping it's my main disk, which is
really a hardware RAID mirror set).

I could use pointers to troubleshooting.
  /var/log/kern.log has nothing but successes.  No joy in /var/log/dmesg, or
/var/log/syslog either.

-- 
Kevin O'Gorman, PhD
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