[Ocfs2-users] POSIX locks supported?

[Frank Lahm]

This was VERY helpful, thanks a lot!

Cheers, Frank

2010/3/10 Sunil Mushran <sunil.mushran at oracle.com>:
> 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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>
>