[Lustre-discuss] Is OFED 'kernel-ib' required for o2ib on RHEL5?

[Lawrence Sorrillo]

Brian:

The caveat here is that the RHEL5 kernel-version used should be one 
supported by SUN?
If this is so then to get a lustre client service one only has to 
install the corresponding

lustre-client-modules-xxxx
lustre-client

Then lustre with IB in RHEL5 should work?

The module, o2iblndm, does not seem to come from a stock RHEL5 build. It 
comes from lustre-client-modules-xxxx?

~Lawrence


~Lawrence

Brian J. Murrell wrote:
> On Mon, 2010-03-22 at 20:22 -0700, Adeyemi Adesanya wrote: 
>   
>> Hi.
>>     
>
> Hi,
>
>   
>> I'm working on installing Lustre 1.8.2 on RHEL5.4. I noticed that the  
>> kernel-ib RPM is not available from the download site.
>>     
>
> That's right.  That's because for RHEL5, our 1.8.2 release has the o2ib
> LND built against the OFED that's in the RHEL5 kernel (1.4.1rc3 IIRC,
> which is what was made 1.4.2, again, IIRC).  So you don't need a
> kernel-ib RPM and o2iblnd will work with RHEL5's built-in OFED.
>
>   
>> I did get hold  
>> of the OFED 1.5 source and built a version of kernel-ib but is this  
>> step essential for o2ib LNET on RHEL5?
>>     
>
> Not at all, per the above.  You just install the RHEL5.4 kernel and then
> when you (or your kernel does a) modprobe o2iblndm all should work just
> fine.
>
>   
>> I would like to try and retain  
>> compatibility with the RedHat OFED distribution and use the versions  
>> of openmpi, etc supplied by RedHat.
>>     
>
> Then I would recommend using the OFED that shipped with the RHEL5.4
> kernel, which is what Lustre 1.8.2 is doing.
>
>   
>> The Lustre 1.8.2 patched  
>> RHEL5 kernel appears to already include Infiniband drivers in "/lib/ 
>> modules/2.6.18-164.11.1.el5_lustre.1.8.2/kernel/drivers/infiniband".  
>>     
>
> These were not put there by us but by RH.  If you look in a stock
> RHEL5.4 kernel you will find the exact same modules.
>
> b.
>
>   
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