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Patchless Client: Difference between revisions

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== Patchless Client ==
== Patchless Client ==
As of Lustre 1.6.0, Lustre supports running the client modules on some unpatched "stock" kernels.
As of Lustre 1.6.0, Lustre supports running the client modules on most modern "stock" kernels without the need for patches to the client kernel. Patches are still required to the Lustre '''server''' kernel, but since these nodes generally only run Lustre this is not a major limitation.
This results in some small performance losses, but may be worthwhile to some users for maintenance or contract reasons.


We will typically post a "patchless" RPM at the [http://www.sun.com/software/products/lustre/get.jsp download site]. Instead, if building from source, the Lustre configure script will automatically detect the unpatched kernel and disable building the servers.
We will typically post a "patchless" RPM at the [http://www.sun.com/software/products/lustre/get.jsp download site] and we strongly recommend that these pre-built RPMs are used instead of building your own.
 
However, if you have to run a kernel on the client that is not one of the supplied kernels, then it is possible to build from source for a wide variety of kernels as listed at the top the lustre/ChangeLog file for that release.  The Lustre configure script will automatically detect the unpatched kernel and disable building the servers.
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* 2.6.21    (1.6.1 [https://bugzilla.lustre.org/show_bug.cgi?id=11647 bug 11647])
* 2.6.21    (1.6.1 [https://bugzilla.lustre.org/show_bug.cgi?id=11647 bug 11647])
* 2.6.22    (1.6.1 [https://bugzilla.lustre.org/show_bug.cgi?id=11647 bug 12764])
* 2.6.22    (1.6.1 [https://bugzilla.lustre.org/show_bug.cgi?id=11647 bug 12764])
* 2.6.23+  (tbd [https://bugzilla.lustre.org/show_bug.cgi?id=14250 bug 14250])


Red Hat Enterprise Linux:
Red Hat Enterprise Linux:
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     write/truncate a binary simultaneously while a user from a different client
     write/truncate a binary simultaneously while a user from a different client
     executes the same binary  
     executes the same binary  
* RHEL4U5 [2.6.9-55EL]  (1.6.0) Red Hat has includesd a Lustre-specific patch with RHEL4U5 which resolves the above issues.
* RHEL4U5 [2.6.9-55EL]  (1.6.0) Red Hat has included a number of fixes that allow Lustre to run with RHEL4U5 which resolves the above issues.
 
* RHEL5 [2.6.18-67.0.22]  (1.6.1 [https://bugzilla.lustre.org/show_bug.cgi?id=11647 bug 11647])
* RHEL5     (1.6.1 [https://bugzilla.lustre.org/show_bug.cgi?id=11647 bug 11647])


Fedora Core:
Fedora Core:
* FC6       (1.6.1 [https://bugzilla.lustre.org/show_bug.cgi?id=11647 bug 11647])
* FC6 [2.6.18]  (1.6.1 [https://bugzilla.lustre.org/show_bug.cgi?id=11647 bug 11647])


Suse:
Suse:
* SLES 10   (tbd)
* SLES 10 [2.6.16-60.0-31]  (1.6.4 [https://bugzilla.lustre.org/show_bug.cgi?id=12411 bug 12411]))
 


=== Known Issues ===
=== Known Issues ===


many NFS-related bugs are also addressed by the patchless client fixes.
many NFS-related bugs are also addressed by the patchless client fixes.

Revision as of 13:38, 2 December 2008

Patchless Client

As of Lustre 1.6.0, Lustre supports running the client modules on most modern "stock" kernels without the need for patches to the client kernel. Patches are still required to the Lustre server kernel, but since these nodes generally only run Lustre this is not a major limitation.

We will typically post a "patchless" RPM at the download site and we strongly recommend that these pre-built RPMs are used instead of building your own.

However, if you have to run a kernel on the client that is not one of the supplied kernels, then it is possible to build from source for a wide variety of kernels as listed at the top the lustre/ChangeLog file for that release. The Lustre configure script will automatically detect the unpatched kernel and disable building the servers. 

 [lustre]$ ./configure --with-linux=/unpatched/kernel/source

Versions

Currently, the patchless client works with these kernel versions

Vanilla kernel:

  • 2.6.15 (1.6.0)
  • 2.6.16 (1.6.0)
  • 2.6.17 (1.6.0) Mandriva's 2.6.17 is also reported working.
  • 2.6.18 (1.6.0) Debian 4.0 2.6.18 is also reported working
  • 2.6.19 (1.6.0)
  • 2.6.20 (1.6.1 bug 11647)
  • 2.6.21 (1.6.1 bug 11647)
  • 2.6.22 (1.6.1 bug 12764)
  • 2.6.23+ (tbd bug 14250)

Red Hat Enterprise Linux:

  • RHEL4 [2.6.9-42.0.8EL] (1.6.0) with the following caveats:
 - Nested Symlinks: due to improper lookup_continue logic with unpatched 2.6.15
   kernels and earlier, nested symlinks will lead to unpredictable results
 - FMODE_EXEC missing: Lustre will incorrectly allow a user from one client to
   write/truncate a binary simultaneously while a user from a different client
   executes the same binary
  • RHEL4U5 [2.6.9-55EL] (1.6.0) Red Hat has included a number of fixes that allow Lustre to run with RHEL4U5 which resolves the above issues.
  • RHEL5 [2.6.18-67.0.22] (1.6.1 bug 11647)

Fedora Core:

Suse:


Known Issues

many NFS-related bugs are also addressed by the patchless client fixes.

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