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Date: Mon, 14 Sep 2009 11:30:38 -0400
To: Miroslav Lachman <000.fbsd@quip.cz>
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Cc: FreeBSD Current <current@freebsd.org>
Subject: Re: ata timeouts under load
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At 11:21 AM 9/14/2009, Miroslav Lachman wrote:


>I have very similar problem with one disk in gmirror, but it is on 
>7.2 not current.

>Sep 14 04:48:29 jimi kernel: ad6: timeout waiting to issue command
>Sep 14 04:48:29 jimi kernel: ad6: error issuing FLUSHCACHE command
>Sep 14 04:48:29 jimi kernel: ad6: TIMEOUT - READ_DMA48 retrying (1 
>retry left) LBA=447001516
>Sep 14 04:48:29 jimi kernel: ad6: FAILURE - READ_DMA48 
>status=51<READY,DSC,ERROR> error=4<ABORTED> LBA=447001516


Are you sure this is not just a bad cable ? I have had similar 
symptoms which was a result of a bad cable.  If possible, swap the 
cable between the 2 disks and see if it follows the cable.

         ---Mike






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