When you say install the associated kernel do you mean patching the kernel like 
below
sudo /sbin/new-kernel-pkg --package kernel --mkinitrd  --dracut --depmod 
--install 2.6.32-573.12.1.el6_lustre.x86_64

I have already done rpm -ivh kernel-2.6.32-573.12.1.el6_lustre.x86_64.rpm


> On Jun 22, 2016, at 2:51 PM, Patrick Farrell <p...@cray.com> wrote:
> 
> The kernel version is found with uname -r or cat /proc/version.
> 
> That needs to match the kernel version in the Lustre RPMs.  (The version 
> string is the 2.6.32-573.12.1.el6_lustre) part.
> 
> In fact, it looks like you've got Lustre server RPMs, given the _lustre in 
> the name of the kernel.  That means you need to install the associated kernel.
> 
> - Patrick
> 
> On 06/22/2016 01:43 PM, Sangeetha Banavathi Srinivasa wrote:
>> Patrick,
>> 
>> The CentOS version on the machines is 6.8
>> 
>>  [lustre@hulk2 ~]$ cat /etc/redhat-release 
>>  CentOS release 6.8 (Final)
>> 
>> 
>> The kernel version that I have installed is what I found along with the 
>> lustre RPMs
>> [lustre@amaranth3 ~]$ uname -r
>> 2.6.32-573.12.1.el6_lustre.x86_64
>> 
>> 
>> And I am trying to install lustre 2.8.
>> 
>> Should the CentOS release version be 2.7??
>> 
>> 
>> 
>>> On Jun 22, 2016, at 2:17 PM, Patrick Farrell <p...@cray.com 
>>> <mailto:p...@cray.com>> wrote:
>>> 
>>> Well, it says to check dmesg...  Though that will just list the symbols.  
>>> In general, this usually means you've got a mismatch between the version of 
>>> the kernel (or OFED) Lustre is built against and your version of either the 
>>> kernel or OFED.  Given the number and locations of the mismatches, I'm 
>>> guessing it's the kernel.
>>> 
>>> So, compare your kernel version and your Lustre RPMs.
>>> 
>>> Regards,
>>> - Patrick
>>> On 06/22/2016 12:47 PM, Sangeetha Banavathi Srinivasa wrote:
>>>> When I try modprobe lustre, I see the below errors:
>>>> [05:44:03] root@hulk2 lustre # modprobe lustre
>>>> WARNING: Error inserting obdclass 
>>>> (/lib/modules/2.6.32-573.12.1.el6_lustre.x86_64/extra/kernel/fs/lustre/obdclass.ko):
>>>>  Unknown symbol in module, or unknown parameter (see dmesg)
>>>> WARNING: Error inserting ptlrpc 
>>>> (/lib/modules/2.6.32-573.12.1.el6_lustre.x86_64/extra/kernel/fs/lustre/ptlrpc.ko):
>>>>  Unknown symbol in module, or unknown parameter (see dmesg)
>>>> WARNING: Error inserting fld 
>>>> (/lib/modules/2.6.32-573.12.1.el6_lustre.x86_64/extra/kernel/fs/lustre/fld.ko):
>>>>  Unknown symbol in module, or unknown parameter (see dmesg)
>>>> WARNING: Error inserting lmv 
>>>> (/lib/modules/2.6.32-573.12.1.el6_lustre.x86_64/extra/kernel/fs/lustre/lmv.ko):
>>>>  Unknown symbol in module, or unknown parameter (see dmesg)
>>>> WARNING: Error inserting fid 
>>>> (/lib/modules/2.6.32-573.12.1.el6_lustre.x86_64/extra/kernel/fs/lustre/fid.ko):
>>>>  Unknown symbol in module, or unknown parameter (see dmesg)
>>>> WARNING: Error inserting mdc 
>>>> (/lib/modules/2.6.32-573.12.1.el6_lustre.x86_64/extra/kernel/fs/lustre/mdc.ko):
>>>>  Unknown symbol in module, or unknown parameter (see dmesg)
>>>> WARNING: Error inserting lov 
>>>> (/lib/modules/2.6.32-573.12.1.el6_lustre.x86_64/extra/kernel/fs/lustre/lov.ko):
>>>>  Unknown symbol in module, or unknown parameter (see dmesg)
>>>> FATAL: Error inserting lustre 
>>>> (/lib/modules/2.6.32-573.12.1.el6_lustre.x86_64/extra/kernel/fs/lustre/lustre.ko):
>>>>  Unknown symbol in module, or unknown parameter (see dmesg)
>>>> 
>>>>> On Jun 22, 2016, at 1:44 PM, Sangeetha Banavathi Srinivasa 
>>>>> <bsan...@vt.edu <mailto:bsan...@vt.edu>> wrote:
>>>>> 
>>>>> Hi,
>>>>> 
>>>>> Below are the steps I executed in configuring MDS.
>>>>> 
>>>>> 1. mkfs.lustre --fsname lustre --mdt --mgs /dev/vg00/mdt
>>>>> 2. mkdir /mdt
>>>>> 
>>>>> 3. mount -t lustre /dev/vg00/mdt /mdt
>>>>> 
>>>>> I see the below error after step 3:
>>>>> 
>>>>> mount.lustre: mount /dev/mapper/vg00-mdt1 at /mdt failed: No such device
>>>>> Are the lustre modules loaded?
>>>>> Check /etc/modprobe.conf and /proc/filesystems
>>>>> [root@amaranth3 lustre]# 
>>>>> 
>>>>> 
>>>>> I tried modprobe lustre and retried mounting but it resulted in the same 
>>>>> error.  Any help will be appreciated.
>>>>> 
>>>>> 
>>>>> For your info, the lustre modules that I have installed are:
>>>>> [root@amaranth3 lustre]# rpm -qa |grep lustre
>>>>> lustre-osd-ldiskfs-mount-2.8.0-2.6.32_573.12.1.el6_lustre.x86_64.x86_64
>>>>> lustre-tests-2.8.0-2.6.32_573.12.1.el6_lustre.x86_64.x86_64
>>>>> lustre-modules-2.8.0-2.6.32_573.12.1.el6_lustre.x86_64.x86_64
>>>>> lustre-osd-ldiskfs-2.8.0-2.6.32_573.12.1.el6_lustre.x86_64.x86_64
>>>>> lustre-iokit-2.8.0-2.6.32_573.12.1.el6_lustre.x86_64.x86_64
>>>>> kernel-2.6.32-573.12.1.el6_lustre.x86_64
>>>>> lustre-2.8.0-2.6.32_573.12.1.el6_lustre.x86_64.x86_64
>>>>> 
>>>>> [root@amaranth3 lustre]# rpm -qa |grep e2fs
>>>>> e2fsprogs-libs-1.42.13.wc5-7.el6.x86_64
>>>>> e2fsprogs-1.42.13.wc5-7.el6.x86_64
>>>>> 
>>>>> [root@amaranth3 lustre]# rpm -qa |grep libss
>>>>> libss-1.42.13.wc5-7.el6.x86_64
>>>>> 
>>>>> root@amaranth3 lustre]# rpm -qa |grep libcom
>>>>> libcom_err-1.42.13.wc5-7.el6.x86_64
>>>>> 
>>>>> 
>>>>> [root@amaranth3 lustre]# uname -a
>>>>> Linux amaranth3 2.6.32-573.12.1.el6_lustre.x86_64 #1 SMP Tue Feb 23 
>>>>> 22:41:09 PST 2016 x86_64 x86_64 x86_64 GNU/Linux
>>>>> [root@amaranth3 lustre]# 
>>>>> 
>>>>> 
>>>>> 
>>>>> Thanks,
>>>>> Sangeetha 
>>>> 
>>>> 
>>>> 
>>>> _______________________________________________
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>>>> <http://lists.lustre.org/listinfo.cgi/lustre-discuss-lustre.org>
>>> 
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>> 
> 

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