On 12/21/2011 12:01 AM, Nirmala S wrote: > Hi, > > > > This is a followup on earlier thread > (http://www.gossamer-threads.com/lists/linuxha/pacemaker/76705). > > > > My situation is somewhat similar. I need to a cluster which contains 3 > kinds of nodes – master, preferred slave, slave. Preferred slave is an > entity that becomes the master in case of switchover/failover. Master is > the master for pref_slave and pref_slave is master for other slaves. The > master election is easy – it is done by crm, all I need to do is use > crm_master. > >
RE subject, the cpg interface is perfect for maintaining replicated state among your cluster nodes. man cpg_overview. Regards -steve > > But for the preferred slave, there needs to an election amongst existing > slaves. As of now I am using a variable in CIB with > pref_slave|pref_slave_score|temp_score. If temp_score is 0, then the > slave will update pref_slave and pref_slave_score and temp_score. If > temp_score is non-zero, then the node compares its score with > pref_slave_score and updates only if it is bigger. > > > > Now I have 2 problems > > 1. Everytime I change the CIB(which I am doing in pre-promote), the > event (pre-promote) is getting retriggered. > 2. The event(pre-promote) is sent in parallel to all the slaves. So > each slave thinks temp_score is 0, and overwrites with its score. Is > there any way to serialize this using some sort of lock ? Or is > there a provision to store cluster-wide attributes apart from CIB ? > > > > Regards > > Nirmala > > > > > > This e-mail and attachments contain confidential information from > HUAWEI, which is intended only for the person or entity whose address is > listed above. Any use of the information contained herein in any way > (including, but not limited to, total or partial disclosure, > reproduction, or > > dissemination) by persons other than the intended recipient's) is > prohibited. If you receive this e-mail in error, please notify the > sender by phone or email immediately and delete it! > > > > > > _______________________________________________ > 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://bugs.clusterlabs.org _______________________________________________ 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://bugs.clusterlabs.org
