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So, one of my servers has a hard disk failure. It's running software RAID, the system locked up and according to /proc/mdstat (and /var/log/messages), it's really down:

Personalities : [raid1]
md2 : active raid1 sdb2[1]
      104320 blocks [2/1] [_U]

md5 : active raid1 sdb5[1]
      2104448 blocks [2/1] [_U]

md6 : active raid1 sdb6[1]
      830134656 blocks [2/1] [_U]

md1 : active raid1 sdb1[1]
      143363968 blocks [2/1] [_U]

and

Nov  5 22:04:37 m38501 smartd[4467]: Device: /dev/sda, not capable of SMART self-check

However

when I do smartctl -H /dev/sda, it passes the test. It also passes the test with smartctl --test=short /dev/sda.

So, is smartctl a broken testing tool, or am I doing something completely off?

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Maybe an intermittent error with the drive electronics? That's the first thing that comes to mind. Be safe and replace the drive.

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  • Yes, I will replace the drive, but then I don't see why it still passes the smartctl tests.
    – Devator
    Nov 5, 2012 at 22:32
  • 1
    That's what "intermittent" means.
    – Michael Hampton
    Nov 5, 2012 at 22:37

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