[Systems] aslo cluster progress

[Bernie Innocenti]

On Fri, 2010-03-12 at 12:48 -0600, David Farning wrote:
> Work this weekend will focus on setting up redundant 'masters' for the
> database, filesystem, and loadbalancer.

Will be traveling on Saturday, so I can assist only on Sunday.
The database part would be straight-forward if we would be content with
a master-slave configuration, but we probably want multi-master, right?


>   The goal will be for a admin (human) to be able to manually switch
> control of the cluster from one node to the other.  From there it will
> be a matter of adding the High Availability (HA) function so the
> cluster can pass control around on its own.
> 
> The interesting problem is not switching control from one machine to
> another machine.  The main problem is insuring that the orginal
> 'master' does not wake up and think that it is still in control.

The famous "split-mind" problem in clusters :-)


> After a couple of slow weeks learning puppet it is nice to be moving
> forward again.

For the record, I think it's ideal for managing the ASLO cluster and I'm
sorry that I still didn't get around to learn it properly.

-- 
   // Bernie Innocenti - http://codewiz.org/
 \X/  Sugar Labs       - http://sugarlabs.org/