NAS device claims drive in a RAID is degraded but S.M.A.R.T. says it is fine

Posted by Nathan Villaescusa on Server Fault See other posts from Server Fault or by Nathan Villaescusa
Published on 2012-10-23T02:36:54Z Indexed on 2012/10/23 5:10 UTC
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raid

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nas

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raid1

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degraded

I have a Synology DS213 with two 600GB drives in RAID 1.

Last night the device reported that my second drive had become degraded and that I should replace it. When I ran a extensive S.M.A.R.T. test the results said that the drive is okay.

How can I confirm that the drive is actually bad? Is there any case that the degraded drive is the good one and that it is actually the other drive that is bad?

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