[elrepo] mpt3sas driver

[Phil Perry]

On 07/03/16 22:05, Roman Serbski wrote:
> On Mon, Mar 7, 2016 at 10:13 PM, Akemi Yagi <amyagi at gmail.com> wrote:
>> On Mon, Mar 7, 2016 at 12:40 PM, Phil Perry <phil at elrepo.org> wrote:
>>>
>>> On 07/03/16 17:36, Roman Serbski wrote:
>>>>
>>>> Hello,
>>>>
>>>> We're experiencing a weird issue with mpt3sas driver under Centos 7
>>>> (7.2.1511) installed on Lenovo System x3650 M5 with 12 SATA drives
>>>> (2TB each). The server will be used as a data node for Big Data
>>>> cluster, hence no RAID just JBOD. CentOS is installed on embedded SD
>>>> card (32GB) and the kernel version is 3.10.0-327.
>>>>
>>>> If I reboot the server one more time everything is back to normal
>>>> until the next reboot.
>>>>
>>>> I've just tried the latest kernel from ELRepo (4.4.4-1) which includes
>>>> version 09.102.00.00 of mpt3sas driver and it works without any issues
>>>> and reboot of the server doesn't change scsi IDs.
>>>>
>>>> I'm not sure how doable it is, but would somebody be so kind to build
>>>> (or help me to build) a kmod package with 09.102.00.00 mpt3sas drivers
>>>> for 3.10.0-327 kernel?
>>>>
>>>> Many thanks in advance.
>>>
>>> Hi,
>>>
>>> I've had a look at the possibility of backporting a newer version of the
>>> driver from a more recent kernel, and unfortunately due to ABI changes this
>>> is simply not possible in this case.
>>>
>>> My first suggestion is that you file a bug report with Red Hat - hopefully
>>> they can fix the issue which will then flow downstream to CentOS. You have
>>> already demonstrated the issue is fixed in a later kernel.
>>>
>>> Second, I would encourage you to review the patches submitted for the 4.4
>>> kernel driver that you have confirmed works, and see if you can identify the
>>> patch(es) that fix the issue (this information would also be extremely
>>> useful for the above bug report):
>>>
>>> https://git.kernel.org/cgit/linux/kernel/git/stable/linux-stable.git/log/drivers/scsi/mpt3sas?h=v4.4.4
>>>
>>> There is then the possibility that we may be able to backport just those
>>> patches to the current RHEL driver to build you an updated kmod driver until
>>> RH is able to release a fix.
>>>
>>> If you need help with that you could try emailing the driver maintainer,
>>> describe your problem and see if (s)he can point you towards the correct
>>> patch.
>>>
>>> Hope that helps.
>>
>> Yet another suggestion is to file a case with IBM and see if they can help.
>> See for example:
>>
>> https://www-947.ibm.com/support/entry/portal/docdisplay?lndocid=migr-5099120
>>
>> Akemi
>
> Thank you very much!  I'm going to try all three suggestions.
>
> After looking at
> https://git.kernel.org/cgit/linux/kernel/git/stable/linux-stable.git/log/drivers/scsi/mpt3sas?h=v4.4.4
> I think that https://git.kernel.org/cgit/linux/kernel/git/stable/linux-stable.git/commit/drivers/scsi/mpt3sas?h=v4.4.4&id=e4bc7f5c21a18cab9acd30940df0ee791fcd7b9e
> might be the one that fixed the issue.
>
> Thanks.

OK, lets see if we can test that hypothesis by building an updated 
driver with that patch backported. Give me a day or two and I'll try to 
knock you up a package to test.

Phil