[elrepo] mpt3sas driver

[Roman Serbski]

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 I've had a look at the possibility of backporting a newer version of the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.