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Date: Thu, 15 Nov 2012 15:56:01 -0700 (MST)
From: Warren Block <wblock@wonkity.com>
To: Gary Aitken <freebsd@dreamchaser.org>
Subject: Re: 9.0 crash, ssd or filesystem problem?
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On Thu, 15 Nov 2012, Gary Aitken wrote:

> Trying to rebuild ports, I'm consistently getting the following:
>
>  ahcich1 Timeout on slot 13 port 0
>                          ^---- slot varies
>  g_vfs_done() ada0p6 [WRITE(offset=38838571008 length=4096)]error=6

That seems familiar, maybe others have reported it.  Is this a 
motherboard controller, or add-in?

After a backup, I'd make sure the motherboard and controller BIOS are up 
to date.  And also the SSD firmware.

> ~$ gpart show ada0
> =>       34  250069613  ada0  GPT  (119G)
>         34        128     1  freebsd-boot  (64k)
>        162   41943040     2  freebsd-ufs  (20G)      /
>   41943202    1048576     3  freebsd-swap  (512M)    swap
>   42991778    8388608     4  freebsd-ufs  (4.0G)     /var
>   51380386    4194304     5  freebsd-ufs  (2.0G)     /tmp
>   55574690  192216088     6  freebsd-ufs  (91G)      /usr
>  247790778    2278869        - free -  (1.1G)

It would not cause this problem, but those partitions are not aligned.
That would only affect speed, not reliability.