Here's the Self-Monitoring Analysis and Reporting Technology or S.M.A.R.T. drive
status for an Adaptec RAID-1 controller with a failed disk.  The disk at this
point is totally removed from the array.  Note that the raid controller
happily reports that all is OK:

[root@gibraltar root]# smartctl -a /dev/sda
smartctl version 5.26 Copyright (C) 2002-3 Bruce Allen
Home page is http://smartmontools.sourceforge.net/

Device: ADAPTEC  RAID-1           Version: 3A0J
Device type: disk
Transport protocol: Fibre channel (FCP-2)
Local Time is: Tue Feb  7 13:22:35 2006 PST
Device supports SMART and is Enabled
Temperature Warning Disabled or Not Supported
SMART Health Status: OK
Current Drive Temperature:     52 C
Drive Trip Temperature:        85 C
Manufactured in week 52 of year 2001
Current start stop count:      31 times
Recommended maximum start stop count:  10000 times

Error counter log:
          Errors Corrected    Total      Total   Correction     Gigabytes    Total
              delay:       [rereads/    errors   algorithm      processed    uncorrected
            minor | major  rewrites]  corrected  invocations   [10^9 bytes]  errors
read:          0        6         0        27         83        150.017          56
write:         0        0         0         0          0       2429.569           0

Non-medium error count:        0
No self-tests have been logged
Long (extended) Self Test duration: 1340 seconds [22.3 minutes]