source: gpfs_3.1_ker2.6.20/lpp/mmfs/src/README @ 177

Please refer to the online GPFS FAQ at

  http://publib.boulder.ibm.com/infocenter/clresctr/topic/com.ibm.cluster.gpfs.doc/gpfs_faqs/gpfs_faqs.html

  for the latest information about GPFS updates, supported kernel levels,
  and kernel patches before building the portability layer.

Linux kernel patches for GPFS can be obtained at

  http://sourceforge.net/tracker/?atid=719124&group_id=130828&func=browse

  which is the patches link for the project
  "General Parallel File System (GPFS)" on Source Forge; only Linux
  kernel patches are kept on the Source Forge site.

You can send license inquiries to gpfs@us.ibm.com
or, in writing, to:

  GPFS Product Manager
  International Business Machines Company
  Dept. LNLA  Mail Station P963
  2455 South Road
  Poughkeepsie NY 12601-5400
  United States of America


To build the Linux portability interface for GPFS
-------------------------------------------------

  It is strongly suggested that you build the source at
  non root level.  You will need to change the owner
  and group permissions accordingly in /usr/lpp/mmfs/src. 

  When you build as a non root user it is also important 
  that you have read access to the linux kernel header files 
  on your machine.  These headers are normally found in 
  /usr/src/linux/include but may appear in a different
  place as enumerated below in step 3 section D.

  The simplest way to build the portability layer is to use 
  the "Autoconfig" process to create the site.mcr file for you.
  
  1) export SHARKCLONEROOT=/usr/lpp/mmfs/src
  2) cd /usr/lpp/mmfs/src 
  3) make Autoconfig
  4) make World
  5) make InstallImages 

  Alternatively, if you have a platform that requires 
  customization, manual creation of the site.mcr file 
  will be necessary as follows.

  1) export SHARKCLONEROOT=/usr/lpp/mmfs/src 
  2) cd /usr/lpp/mmfs/src/config
     cp site.mcr.proto site.mcr

  3) Edit and customize the site.mcr file.
  
     A) The default architecture is GPFS_ARCH_I386. Only modify the 
        architecture choice if your platform is not Intel 32-bit based (IA32).

     B) Modify the Linux distribution choice according to the software
        distribution your machine runs.

     C) Modify the Linux distribution level according to the level of the
        software distribution your machine runs. 

     D) Modify the LINUX_KERNEL_VERSION according to the Linux kernel
        level you are using with your software distribution.

     E) Note also that the kernel header file search path, 
        KERNEL_HEADER_DIR, is by default /lib/modules/`uname -r`/build/include

        Customers who have their kernel source headers in a different 
        directory will need to modify KERNEL_HEADER_DIR.  For instance 
        another common location for the kernel headers is /usr/src/linux/include.

        YOU MUST HAVE READ ACCESS TO THESE HEADERS!

     F) Uncomment any desired Linux kernel patches listed under
        LINUX_PATCH_DEFINES.

        The kernel will also need to be rebuilt and installed with 
        the appropriate patches, which can be obtained from 
        http://sourceforge.net/tracker/?atid=719124&group_id=130828&func=browse.

        The online GPFS FAQ has detailed information on each patch.

  4) If no LINUX_PATCH_DEFINES are applied above and the kernel is 
     not recompiled, some distributions will still require more 
     preparation of kernel headers.

     A) On SuSE Enterprise Server 8 PowerPC you will need to:

        Install the kernel source

        cd /lib/modules/`uname -r`/build
        sh make_ppc64.sh distclean
        sh make_ppc64.sh clean
        sh make_ppc64.sh mrproper
        sh make_ppc64.sh cloneconfig
        sh make_ppc64.sh dep

     B) On SuSE Enterprise Server 8 AMD64 you will need to:

        Install the kernel source

        cd /lib/modules/`uname -r`/build
        make distclean
        make clean
        make mrproper
        make cloneconfig
        make dep

     C) On SuSE Enterprise Server 9 all platforms you will need to:

        Install the kernel source

        The default header file path must be changed.  KERNEL_HEADER_DIR can
        instead be set to /lib/modules/`uname -r`/source/include

  5) cd /usr/lpp/mmfs/src

  6) make World

  All of the kernel modules and libraries reside in the "bin" 
  subdirectory after the build.


To install the Linux portability interface for GPFS into /usr/lpp/mmfs/bin
--------------------------------------------------------------------------

  This step installs the binaries for the portability interface.

  1) su

  2) make InstallImages

     The files mmfslinux, lxtrace, tracedev, and dumpconv will be
     installed in /usr/lpp/mmfs/bin.  If the system is using a 2.6 kernel, 
     there will be an additional mmfs26 binary.  If this kernel configuration
     applies to other machines in the cluster, you may then copy
     these binaries to those machines, or iteratively perform the
     above compile and install steps on each machine.

Additional Notes
----------------

  Most of the source code headers are in the "ibm-kxi" and "ibm-linux"
  directories, while the source code is in the "gpl-linux" directory.

  The "config" directory provides the configuration information for 
  the build (site.mcr) and the "misc" directory handles some items 
  that allow us to reuse our standard development Imakefiles.


Troubleshooting build problems
------------------------------
Most commonly encountered build problems are caused by an incorrect setting
of KERNEL_HEADER_DIR, or an incorrect setup of the kernel source tree.  GPFS
requires a full set of kernel headers in order to build; a subset of kernel
headers provided to build "typical" kernel modules may be insufficient and
could lead to build breaks.  Specifically, on SuSE Enterprise Server 9 and 10,
the directory pointed to by the /lib/modules/`uname -r`/build symlink contains
only a subset of kernel headers, while the directory pointed to by
/lib/modules/`uname -r`/source contains a full source tree.

Some files in the full source tree, most notably include/linux/version.h and
include/linux/autoconf.h, are often configured dynamically by an external shell
script (e.g. /etc/init.d/running-kernel on SuSE Enterprise Server), which
copies a set of files into the source tree to make it match the currently
booted kernel (that way one can boot different kernels but have the same
source tree always configured to match it).  If the kernel source tree is
updated but the shell reconfiguration script hasn't run (it usually runs
during the boot sequence), or the script didn't work correctly, the kernel
source tree may not be configured properly.

NOTE: On SuSE Enterprise Server 10 for PowerPC, /etc/init.d/running-kernel
that ships with the GA level of distribution (kernel-source-2.6.16.21-0.8)
contains a bug that results in the wrong set of files being copied to the
kernel source tree.  This bug will be fixed with SLES10 SP1.  If the official
fix is unavailable, the following change should also address the problem:

--- running-kernel.orig 2006-10-06 14:54:36.000000000 -0500
+++ /etc/init.d/running-kernel  2006-10-06 14:59:58.000000000 -0500
@@ -53,6 +53,7 @@
     arm*|sa110)        arch=arm ;;
     s390x)     arch=s390 ;;
     parisc64)  arch=parisc ;;
+    ppc64)     arch=powerpc ;;
     esac
     # FIXME: How to handle uml?