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Date: Sun, 21 Jun 2015 16:01:55 -0500 (CDT)
From: Bob Friesenhahn <bfriesen@simple.dallas.tx.us>
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To: Steve Wills <swills@freebsd.org>
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Subject: Re: This diskfailure should not panic a system, but just disconnect
 disk from ZFS
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On Sat, 20 Jun 2015, Steve Wills wrote:
>> rev=0x00 hdr=0x00
>>     vendor     = 'Areca Technology Corp.'
>>     device     = 'ARC-1120 8-Port PCI-X to SATA RAID Controller'
>>     class      = mass storage
>>     subclass   = RAID
>
> You may be hitting the zfs deadman panic, which is triggered when the
> controller hangs. This can in some cases be caused by disks that die in unusual
> ways.

Notice that the RAID controller is a PCI-X device (shared parallel, 
not dedicated serial like PCIe).  The whole PCI backplane could have 
hung.

Bob
-- 
Bob Friesenhahn
bfriesen@simple.dallas.tx.us, http://www.simplesystems.org/users/bfriesen/
GraphicsMagick Maintainer,    http://www.GraphicsMagick.org/