On 11-05-19 05:39 AM, Tejun Heo wrote:
> Hello, Mark.
>
> On Wed, May 18, 2011 at 03:07:26PM -0400, Mark Lord wrote:
>> But it also fails equally well without the patch. :)
>
> Awesome! :)
>
>> The eSATA host controller is the ever-popular JMicron:
>>
>> 04:00.0 SATA controller: JMicron Technology Corp. JMB362/JMB363 Serial ATA
>> Controller (rev 02)
>> (197b:2363)
>>
>> Just about everything around here has one of those JMicron chips
>> for the eSATA ports, so I'm guessing that this problem may be
>> somewhat more widespread than just my home office.
>
> Can you send me a link of the PMP device?
Here's the URL. It's a dual-bay eSATA/USB2 dock.
I use these all over the place, with fans added on (by me):
ncix.com/products/?sku=36051
>> So what next?
>> I suspect something isn't quite right in the JMicron AHCI driver code.
>
> I have no idea. I'll get one and see what's up with it.
Thanks!
Whatever the chip inside is, it is reasonably clever:
1. With just a single drive installed, it shows up
as a single-drive, not a PMP.
2. With two drives installed, it enumerates as a PMP.
3. When used over USB2 instead of eSATA, it shows up as a single dev with two LUNs,
rather than as a USB-hub with two devices. Fine by me. :)
4. Spins down the drives when the USB cable is detached (or host sleeps).
Cheers
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