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I have a Ubuntu server with 9 backplanes. Each backplane can have 5 hard drives (45 in total). I plugged in 45 hard drives, and a quick ls /dev/sd* shows only 43 drives (other than the boot drive). Is there a quick way to find out which two hard drives are bust?

The back planes are wired in a special order, so that if all the hard drives were working, I know exactly which slot is sdb, sdc and so on. I can list the serial numbers of the hard drives using smartctl -a /dev/sdb | grep Serial for each drive, and then match them physically by looking at the drives. But I was hoping that there will be an easy way to find it out!

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Exercise them and check the activity LEDs? –  RedGrittyBrick Sep 28 '12 at 7:08
    
Oh yea... I could have done that. Although the LEDs are not that visible in this particular, but I could have tried. By the way I found the two bust drives. The strange thing is, they were rotating and when I pulled them out, I saw some exception on the screen. But anyways, they didn't work on another server either. –  Richard Whitman Sep 28 '12 at 7:12
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