To get this feature, one needs both a kernel >= 2.6.28 and a
functioning userspace cluster stack.
ocfs2 1.4 on (rh)el5/sles10 does not satisfy either of the two.
As of now, there are two such stacks. Pacemaker from Novell and
the "new" CMAN (new is my term... unsure how RH will be marketing
it) from Red Hat.
For Enterprise kernels, currently only SLES11 (HAE) satisfies both
requirements. (RH)EL6, when it ships, should also offer the same.
For non-enterprise distros, you will have to see the state of
the clusterstack in that distro.
For Fedora, the upcoming FC13 will be your best bet.
For ubuntu, the upcoming 10.04 looks promising.
https://wiki.ubuntu.com/ClusterStack/LucidTesting#Pacemaker,%20drbd8%20and%20OCFS2%20or%20GFS2
Sunil
Frank Lahm wrote:> Hi list,
>
> does latest ocfs2 support POSIX locks or doesn't it? The infos I've
> found contradict each other, according to [1] it's not supported, but
> according to [2] it's mentioned as working since kernel
> 2.6.28:
> ---8---
> Cluster aware POSIX file locks (fcntl(), lockf())
>
> Required Kernel: Linux 2.6.28
> Required Tools: Any - userspace cluster stack required
> POSIX locks are now cluster aware. Locks taken on one node will
> interact with those taken on another node. Due to the group
> communication required to make these locks coherent, a userspace
> cluster is required.
> ---8---
>
> Cheers, Frank
>
> [1]
<http://oss.oracle.com/projects/ocfs2/dist/documentation/v1.4/ocfs2-1_4-usersguide.pdf>:
> p.12: "(Note: Support for clustered POSIX file locks, also known as
> lockf(3) or fcntl(2), has not yet been added. We hope to have that
> available in the near term.)"
> [2] <http://oss.oracle.com/osswiki/OCFS2/NewFeaturesList>
>
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