[Linux-cluster] relationship corosync + dlm + cman in cluster 3.1.3

[Andrew Beekhof]

On Tue, Jun 28, 2011 at 5:12 PM, Jeroen Koekkoek <j.koekkoek at perrit.nl> wrote:
> Hi Andrew,
>
> Thanks for answering my question. While looking at the current source tree, I noticed newer versions, at least dlm_controld, will not use cman anymore. So I'll keep using 3.0.12 for now (with dlm_controld.pcmk). Do you have any estimate on the first release without cman?

Of the dlm etc? No. You'd have to talk to the owners of those projects.
At a guess maybe a year from now.

>
> Regards,
> Jeroen
>
>> -----Original Message-----
>> From: linux-cluster-bounces at redhat.com [mailto:linux-cluster-
>> bounces at redhat.com] On Behalf Of Andrew Beekhof
>> Sent: Monday, June 27, 2011 1:24 AM
>> To: linux clustering
>> Subject: Re: [Linux-cluster] relationship corosync + dlm + cman in
>> cluster 3.1.3
>>
>> On Wed, Jun 22, 2011 at 5:55 PM, Jeroen Koekkoek <j.koekkoek at perrit.nl>
>> wrote:
>> > Hi,
>> >
>> > I have a question regarding the relationship between Corosync, DLM,
>> and CMAN. Is the following statement correct?
>> >
>> > The DLM is a kernel module, dlm_controld is the control daemon.
>> > CMAN is the old messaging layer, and is now stacked on OpenAIS, which
>> in turn is stacked on Corosync.
>> >
>> > The DLM does not use CMAN (or Corosync for that matter) to
>> communicate, but does fetch node information from CMAN.
>> >
>> > The filesystem (GFS or OCFS2) speaks to the DLM locally (in kernel?)
>> and the DLM takes care of the communication.
>> >
>> >
>> > Now for the real question.
>> >
>> > In the 3.1.3 release dlm_controld still depends on CMAN, but is it
>> safe to say that I can just use Pacemaker and Heartbeat resource agents
>> and only install CMAN so that dlm_controld can query node information?
>> >
>> > Or did I misunderstand the documentation?
>>
>> You need to make sure everyone is getting the same membership and quorum
>> information.
>> So yes, install CMAN for dlm_controld but also tell pacemaker to use it
>> too (make sure you're on 1.1.5 or higher).
>>
>> >
>> > Regards,
>> > Jeroen
>> >
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