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I have being running on three 2TB hard drives in software raid for a little under a year how under Ubuntu Server.

After restarting my computer mdadm would not allow a boot because the raid was degraded.

I booted in to Ubuntu desktop USB trail mode thingy. After looking in disk until I managed to see that 2 drives were fine but one of them had seemed to have lost its partition tables. The smart report on it said it was perfect with nothing to report.

I have added it back to the raid array which is going to take some time. But was wondering what made this happen? Can I stop it happening again? Should I replace that drive anyway or test it somehow?

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Well in the end, I backed all my data up and formated all the drives. Reinstalled the OS on them and seems to running fine. – Simon Bennett Oct 14 '12 at 10:31

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