On Tue, Jul 12, 2011 at 3:28 AM, Yasha Karant <[log in to unmask]> wrote:
> On 07/11/2011 01:51 PM, Connie Sieh wrote:
>>
>> On Mon, 11 Jul 2011, Yasha Karant wrote:
>>
>>> I have been attempting to get a working USB 3 external harddrive
>>> subsystem. Thus far, no go.
>>>
>>> Here is what I have found:
>>>
>>> 1. kernel 2.6.38.6-26.rc1.fc15.x86_64 works fine for USB 3, but
>>> requires gcc 4.6 to build any kernel modules; RHEL 6 (SL 6, CentOS 6)
>>> uses gcc 4.4. Thus, neither the Nvidia nor VirtualBox modules will
>>> build on on a RHEL 6 system.
>>>
>>> 2. kernel 2.6.33.3-85.fc13.x86_64 that was built with gcc 4.4 works,
>>> but only partially -- please see point 3.
>>>
>>> 3. After installing both of the above kernels, kernel
>>> 2.6.32-131.2.1.el6.x86_64 now functions essentially the same as
>>> 2.6.33.3-85.fc13.x86_64 . The device is recognized and /dev/sde and the
>>> partitions thereunder /dev/sde1 ... are created. However, no automount
>>> points are created that were created with 2.6.38.6-26.rc1.fc15.x86_64 .
>>> Moreover, fdisk /dev/sde fails. A reading of dmesg shows numerous
>>> exceptions and diagnostics that are documented in USB 3 linux kernel
>>> development hits during a web search and that evidently were fixed in
>>> later kernels (such as 2.6.38.6-26.rc1.fc15.x86_64 ). I am not going to
>>> reproduce these here, but suffice it to say that the /dev/sde set
>>> appears, vanishes as evidenced by the output of /ls/dev/sd* and then
>>> reappears.
>>>
>>> Note that all of the hardware and systems commands, etc., work on a USB
>>> 2 port on this system.
>>>
>>> An attempt to build from source 2.6.38.6-26.rc1.fc15.x86_64 using the
>>> gcc 4.4 system of SL6 is my next step, rpmbuild --rebuild
>>> kernel-2.6.38.6-26.rc1.fc15.src.rpm .
>>>
>>> Yasha Karant
>>>
>>
>> Since usb 3 worked for your chipsets on a prior RHEL 6 kernel and does
>> not work on the current RHEL 6 kernel . I suggest you search
>> bugzilla.redhat.com looking for your issue. If you do not find the issue
>> please bugzilla it.
>>
>> -Connie Sieh
>
> From:  https://bugzilla.redhat.com/show_bug.cgi?id=683681
>
> usb3 is still a little flaky on error recovery.  That is what happened here.
> The endpoint (device) stalled for whatever reason and it had trouble
> resetting
> the port back to a good known state.
>
> A bit later in the thread:
>
> I've updated to 6.1beta 2.6.32-122.el6.x86_64 and
> now the USB3 card does not see anything connected
> to it.
>
> And still a bit later:
>
> What happens if you unplug the hard drive, reboot the machine, login, the
> plug
> in the harddrive?  Is that more stable?
>
> later in the bugzilla thread:
>
> RHEL Product and Program Management 2011-04-03 22:49:52 EDT
>
> Since RHEL 6.1 External Beta has begun, and this bug remains
> unresolved, it has been rejected as it is not proposed as
> exception or blocker.
>
> Red Hat invites you to ask your support representative to
> propose this request, if appropriate and relevant, in the
> next release of Red Hat Enterprise Linux.
>
> Cheers,
> Don
>
> End thread.
>
> Unlike RHEL 6 and perhaps CentOS 6, SL 6 has additions that solve real
> problems so that real hardware can be used in the real world of hard
> science.  I think that I have come close to establishing that later releases
> of the Linux kernel (e.g., 2.6.38) actually solve the USB 3 problem.  Is it
> possible for SL 6 to offer a solution as a add-on/extended but real
> solution, as SL 6 supports hardware beyond standard RHEL 6?
>
> Yasha Karant
>

Yasha,

Feel free to talk to ELREPO people, they are planning to release a
newer/enhanced kernel-ml for EL6:
http://elrepo.org/bugs/view.php?id=153