On Tue, 10 Aug 2010, Rogier Wolff wrote:

quoted text
> On Tue, Jun 15, 2010 at 10:25:32AM -0700, Alan wrote:
>> On Tue, 2010-06-15 at 16:01 +0100, Alan Cox wrote:
>>>> Is one of these modules the driver for this controller? I think it's
>>>> AHCI: lshw says it uses ports cc00 ... and a bunch of others, and
>>>> those ports are claimed by ahci according to /proc/ioports. Ah! I need
>>>> better eyes. lshw already mentions that it's ahci...
>>>
>>> AHCI will be driving it.
>>
>> I have seen this problem with the 2.6.33 kernel in Fedora 13. The
>> problem goes away in 2.6.35-rc3. (Though networking is fubared for me on
>> that kernel, so I have not migrated to it.)
>>
>> My understanding is the "fix" in the driver was to blacklist ncq for
>> that controller. I have not verified that yet.
>
> One of my disks died again a while ago. So I went to the machine to
> replace the drive. But I forgot to write down which one had died. So I
> started it up again. Now I had 7 disks again like before, but a
> different drive was now "gone". So my RAID had only 6 out of 8 drives
> and was "gone". Together with some 4.7T worth of data on it....
>
> Next I went to the machine with a spare sata card. I removed the
> drives from the ASUS U3S6 card, and put them on the old pci sata card.
>
> By the time I logged in on the machine, the RAID had found 8/8 drives
> and I think it had already started rebuilding.....
>
> I now haven't had any problems with the drives in more than a week.
>
> Performance of the raid has dropped from 600Mb to around 400Mb/sec,
> obviously because the PCI card cannot handle 200Mb/sec of disk IO.
>
> I'm open to suggestions for cheap highperformance WORKING PCIe sata
> cards....

I found that if I ran the latest of Linus' kernels, the controller worked 
correctly.  There is obviously a change that needs to get backported into 
the other working kernels.

-- 
Truth is stranger than fiction because fiction has to make sense.
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