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Date: Wed, 12 May 2010 16:03:00 -0400
To: "A. Wright" <andrew@qemg.org>
From: Mike Tancsa <mike@sentex.net>
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Cc: "freebsd-questions@freebsd.org" <freebsd-questions@freebsd.org>
Subject: Re: Long I/O pauses on same mass storage
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At 03:48 PM 5/12/2010, A. Wright wrote:

>I just noticed, however, the following two interesting lines that
>/var/log/messages seems to have acquired:
>         May 12 15:44:00 qemg kernel: ad8: FAILURE - SMART 
> status=51<READY,DSC,ERROR> error=4<ABORTED>
>         May 12 16:05:27 qemg kernel: swap_pager: indefinite wait 
> buffer: bufobj: 0, blkno: 294, size: 8192

>The first dates from the point at which I turned on SMART data logging.
>The second one, however looks more interesting to me -- am I correct
>in thinking that there is no good reason why the "swap_pager" error
>would appear, aside from some sort of hardware related failure?

When I see errors from the OS, but not on the actual disk itself, 
apart from driver errors (relatively rare on FreeBSD) it can be a 
cable issue or bad SATA port.

But as chuck said, post all of the output from smartctl -a

         ---Mike