Lustre discuss - Mar 2009 - mismatching versions between kernel and client

Hi there,

I am trying to install a patchless Lustre client on a CentOS 5.2 system from
RPM. I downloaded the following two RPMs:
    *  lustre-client-1.6.7-2.6.18_92.1.17.el5_lustre.1.6.7smp.i686.rpm
    * lustre-client-modules-1.6.7-2.6.18_92.1.17.el5_lustre.1.6.7smp.i686.rpm 

However, the kernel of my system is slightly different: 2.6.18-92.e15.
Therefore, the installed modules are located in a different directory in
/lib/modules to the system kernel. I manually created symbolic links of the fs
and net directories into the system kernel directory. However, I am still not
able to load the lustre modules.  Note that the files at the top directory such
as modules.dep are not copied.

The whole problem comes from the slight difference between the versions of the
kernel and the modules. I am wondering if there is a simple way to get the
modules loaded without installing a new kernel.

Any help will be greatly appreciated. Thanks a lot.

Shi Jin

On Mon, 2009-03-23 at 08:31 -0700, Shi Jin wrote:
> Hi there,
> 
> I am trying to install a patchless Lustre client on a CentOS 5.2 system
from RPM. I downloaded the following two RPMs:
>     *  lustre-client-1.6.7-2.6.18_92.1.17.el5_lustre.1.6.7smp.i686.rpm
>     *
lustre-client-modules-1.6.7-2.6.18_92.1.17.el5_lustre.1.6.7smp.i686.rpm
> 
> However, the kernel of my system is slightly different: 2.6.18-92.e15.
You have two choices.  Either upgrade the kernel on your system to
2.6.18_92.1.17.el5 (which is the suggested route as it gets you a newer
kernel with more recent patches applied) or rebuild lustre from the
lustre-source rpm using the kernel-devel for the kernel you wish to use.
> Therefore, the installed modules are located in a different directory in
/lib/modules to the system kernel. I manually created symbolic links of the fs
and net directories into the system kernel directory.
You can''t/shouldn''t do this.
> However, I am still not able to load the lustre modules.
Right.  This is not surprising.  You really do need to match the lustre
modules to the right kernel.
> The whole problem comes from the slight difference between the versions of
the kernel and the modules. I am wondering if there is a simple way to get the
modules loaded without installing a new kernel.
The only other option, as I mentioned is to build the lustre modules for
the kernel you wish to use.

b.

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> You have two choices.? Either upgrade the kernel on
> your system to
> 2.6.18_92.1.17.el5 (which is the suggested route as it gets
> you a newer
> kernel with more recent patches applied) or rebuild lustre
> from the
> lustre-source rpm using the kernel-devel for the kernel you
> wish to use.
> 
Thank you very much.
I actually wanted to build the lustre module for my kernel. But when I tried to
download the lustre-source, the RPM comes with is a specific kernel version
associated with it. Is it OK for me to download the source where the kernel
version from the file name is different from the kernel version I am using?
Specifically, shall I get 
lustre-client-source-1.6.7-2.6.16.60_0.31_lustre.1.6.7_bigsmp.i686.rpm? (but its
kernel version does not match mine) Or shall I get 
rhel5-i686-client-lustre-1.6.7.tar.gz (is it different from
sles10-i686-client-lustre-1.6.7.tar.gz?)? Does rhel5 covers all minor version
changes such as rhel5.3?

Thank you very much for your help.
Shi Jin

On Mon, 2009-03-23 at 09:06 -0700, Shi Jin wrote:
> Thank you very much.
You are welcome.
> I actually wanted to build the lustre module for my kernel. But when I
tried to download the lustre-source, the RPM comes with is a specific kernel
version associated with it. Is it OK for me to download the source where the
kernel version from the file name is different from the kernel version I am
using?
Indeed, it is.  That brings up an interesting point in the naming of the
lustre-source RPM though.  I will give this some thought.
> Specifically, shall I get 
lustre-client-source-1.6.7-2.6.16.60_0.31_lustre.1.6.7_bigsmp.i686.rpm? (but its
kernel version does not match mine) Or shall I get 
rhel5-i686-client-lustre-1.6.7.tar.gz (is it different from
sles10-i686-client-lustre-1.6.7.tar.gz?)? Does rhel5 covers all minor version
changes such as rhel5.3?
You should get the lustre-source rpm that most closely matches your
kernel, which IIRC was a RHEL5 kernel, so get the lustre-source for the
2.6.18-whatever kernel.
> Thank you very much for your help.
NP.

b.

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Thank you very much.
I downloaded rhel5-i686-client-lustre-1.6.7.tar.gz and installed it on my CentOS
5.2 by doing
./configure --with-linux=/usr/src/kernels/2.6.18-92.1.22.el5-i686/
* make; make install
Now in my /lib/modules/`uname -r`/kernel I have the lustre modules in both fs
and net. However, I still get
[root at host136-159-94-201 kernel]# modprobe lustre
FATAL: Module lustre not found.

There is no error in the whole building process. Did I miss anything? Thanks a
lot.

Shi

One more question:
>From the download site, we have
lustre-client-source-1.6.7-2.6.16.60_0.31_lustre.1.6.7_bigsmp.i686.rpm
lustre-source-1.6.7-2.6.16.60_0.31_lustre.1.6.7_bigsmp.i686.rpm
rhel5-i686-client-lustre-1.6.7.tar.gz
rhel5-i686-lustre-1.6.7.tar.gz

It seems that the lustre and lustre-client files are nearly identical. Is there
a reason to provide two files and which one should I use?
Thank you very much.

Shi

Shi Jin wrote:
> Thank you very much.
> I downloaded rhel5-i686-client-lustre-1.6.7.tar.gz and installed it on my
CentOS 5.2 by doing
> ./configure --with-linux=/usr/src/kernels/2.6.18-92.1.22.el5-i686/
> * make; make install
> Now in my /lib/modules/`uname -r`/kernel I have the lustre modules in both
fs and net. However, I still get
> [root at host136-159-94-201 kernel]# modprobe lustre
> FATAL: Module lustre not found.
>
> There is no error in the whole building process. Did I miss anything?
Thanks a lot.
>   
Have you done ''depmod -a''?

tamas

> 
> Have you done ''depmod -a''?
> 
Oh right. How could I forget this! Thank you very much.
Now the patchless client is working.
Thank you both.

Shi