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From: Ivan Voras <ivoras@freebsd.org>
Date: Mon, 21 Dec 2009 12:46:01 +0100
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Subject: Re: errrors resyncronizing mirror with new disk
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johnea wrote:
> Hello,
> 
> Recently a drive started to have READ_DMA failures and drop out of the gmirror.
> 
> While synching the replacement drive to the mirror, a WRITE error occured and terminated the sync.
> 
> A second attempt to sync completed but left the drive generating READ errors.
> 
> The third time the drive was inserted in the mirror the operation completed and no further errors have occured.
> 
> R'ingTFM and extensive scroogling have not yielded an explanation.
> 
> Is this expected behaviour? Should I suspect this drive? 
> (it's brand new, but the "old" one was only 9 months)

Yes. Probably either the drives or the power unit.

> Additionally smartctl on the new drive continues to indicate no errors.
> (it did indicate each of the read errors on the old drive)