On Fri, Jul 30, 2010 at 2:15 PM, chajo <shakes1...@yahoo.com> wrote: > Hi, > i am a beginner in pacemaker and in the process of understanding it > better. its usage on openais stack. while reading about cluster properties i > came across this problem "clsuter amnesia". i am not sure this problem exists > in Pacemaker ( i dont have setup right now to experiment this :( ) > > i am aware that when a node in a Pacemaker(on openais) has its configuration > updated locally it is synchronized on all nodes of that cluster. and read in > Pacemaker documentation that whenever a node joins cluster asks the node with > the highest (admin_epoch, epoch,num_updates) tuple to replace the > configuration on all the nodes. i understood this is the case when nodes are > online. > > cluster amnesia is basically on a two node cluster (node A, node B), if node > A is down and node B is up.. and on node B we add 2 new resources (make > someother config change) and save the configuration. next we bring node B > down. now when we start node A it comes up with old configuration ( it missed > newly added 2 resources on node B). > > i would like to understand whether this problem exists with with pacemaker?
Of course it does. How is A supposed to know about the new configuration if its down when the change is made and no-one is around when it comes up? Telepathy? > > or some solution already exists in Pacemaker to take care of this problem? "Don't do that" > i tried to search the forum with keyword "amnesia" couldn't get any results > > am going to experiment this once i get setup in two days. > > > thanks in advance > chajo > > > _______________________________________________ > Pacemaker mailing list: Pacemaker@oss.clusterlabs.org > http://oss.clusterlabs.org/mailman/listinfo/pacemaker > > Project Home: http://www.clusterlabs.org > Getting started: http://www.clusterlabs.org/doc/Cluster_from_Scratch.pdf > Bugs: > http://developerbugs.linux-foundation.org/enter_bug.cgi?product=Pacemaker > _______________________________________________ Pacemaker mailing list: Pacemaker@oss.clusterlabs.org http://oss.clusterlabs.org/mailman/listinfo/pacemaker Project Home: http://www.clusterlabs.org Getting started: http://www.clusterlabs.org/doc/Cluster_from_Scratch.pdf Bugs: http://developerbugs.linux-foundation.org/enter_bug.cgi?product=Pacemaker
