[Pacemaker] future of DLM

[Lars Marowsky-Bree]

On 2013-02-25T11:42:46, "Lentes, Bernd" <bernd.lentes at helmholtz-muenchen.de> wrote:

Hi Bernd,

> in the german IT newspaper "Linux-Magazin" 2/13 was an article, which says that the future of DLM (Distributed Lock Manager) is unclear.
> I'd like to create a HA cluster with two nodes, accessing concurrently one FC SAN with OCFS2. I need DLM.
> I wonder that the future is unclear because, afaik, DLM is integrated in the kernel. If it is not properly maintained, of course i would not like to use it.

The article is a bit ... exaggerating. The in-kernel DLM of course
continues to be mainainted, and OCFS2 (in user-space mode) will continue
to consume it too. (Just like GFS2.)

It also accusses SLE HA of sticking to an old DLM version, which isn't
true either - it's true we backport changes selectively (and can't break
the wire protocol, which affects the controld user-space code we can use
there), but that's the whole point of a "stable" enterprise
distribution.

It's a bit alarmist. But the author should be participating on this
list, that should be a fruitful discussion ;-)


Regards,
    Lars

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Architect Storage/HA
SUSE LINUX Products GmbH, GF: Jeff Hawn, Jennifer Guild, Felix Imendörffer, HRB 21284 (AG Nürnberg)
"Experience is the name everyone gives to their mistakes." -- Oscar Wilde