ZFS hang status update

[Artem Belevich]

On Fri, Oct 19, 2012 at 10:38 PM, Dennis Glatting <freebsd at pki2.com> wrote:
> This is da0 (the cache --SSD) on which camcontrol hanged. It is on the
> same controller.
>
> da0 at mps0 bus 0 scbus0 target 3 lun 0
> da0: <ATA M4-CT256M4SSD2 000F> Fixed Direct Access SCSI-6 device
> da0: 600.000MB/s transfers
> da0: Command Queueing enabled
> da0: 244198MB (500118192 512 byte sectors: 255H 63S/T 31130C)

Hmm.. It may be a coincidence, but at work I do see same 256G M4 SSDs
used as L2ARC+swap hanging now and then. In my case they are connected
to SATA2 on Supermicro X8DTi-F motherboard (ICH10?) running
FreeBSD8-stable/amd64.

It does not happen often -- few times for the last half a year or so.
I was hoping that new firmware would fix the issue, but firmware rev
000f still hangs.

Crucial had released new firmware (010G) few weeks back but I didn't try it yet.

--Artem