[Pacemaker] [Linux-HA] pcmk + corosync + cman for dlm support?

[Tim Serong]

On 11/03/2011 04:11 PM, Vladislav Bogdanov wrote:
> 02.11.2011 16:36, Nick Khamis wrote:
>> Vladislav,
>>
>> Thank you so much for your response. Just to make sure, all I need is to:
>> * Apply the three patches to cman. Found here
>> "http://www.gossamer-threads.com/lists/linuxha/pacemaker/75164?do=post_view_threaded".
>> * Recompile CMAN
>> * Do I have to recompile PCMK again?
>>
>> I also want to mention that fencing is not important right now, and I
>> would like to disable fencing JUST for the prototype,
>> and untill things are going. I am almost there (cman-pcmk+ocfs2) with
>
> That patches are for fencing only.
> I have no idea about what goes wrong with your ocfs2_controld, I gave up
> on trying ocfs2 because it hangs the whole cluster for me.

That reminds me...  Nick, if you disable fencing (even for your 
prototype), and you experience (or try to test) any kind of split brain, 
or you kill one node (ungracefully), the clustered filesystem on all the 
other (surviving) nodes will freeze/lock up, because the cluster is 
unable to fence the failed node.  Even if you choose something like 
meatware (see http://clusterlabs.org/doc/crm_fencing.html), you should 
still configure *some* means of fencing for any prototype system that's 
going to need fencing when put into production :)

Regards,

Tim
-- 
Tim Serong
Senior Clustering Engineer
SUSE
tserong at suse.com