On 03/22/2011 11:26 PM, José Pablo Méndez Soto wrote: > Hi, I am starting to play around with clustering and stuff. Can someone > please explain what openAIS is? Or better said, what is the difference > between OpenAIS and Corosync? > > Thanks, > > > *José Pablo Méndez
(copied from a document I am working on) Component; openais / corosync OpenAIS is the heart of the cluster. All other computers operate though this component, and no cluster component can work without it. Further, it is shared between both Pacemaker and RHCS clusters. In Red Hat clusters, openais is configured via the central cluster.conf file. In Pacemaker clusters, it is configured directly in openais.conf. As we will be building an RHCS, we will only use cluster.conf. That said, (almost?) all openais.conf options are available in cluster.conf. This is important to note as you will see references to both configuration files when searching the Internet. A Little History There were significant changes between RHCS version 2, which we are using, and version 3 available on EL6 and recent Fedoras. In the RHCS version 2, there was a component called openais which handled totem. The OpenAIS project was designed to be the heart of the cluster and was based around the Service Availability Forum's Application Interface Specification. AIS is an open API designed to provide inter-operable high availability services. In 2008, it was decided that the AIS specification was overkill for RHCS clustering and a duplication of effort in the existing and easier to maintain corosync project. OpenAIS was then split off as a separate project specifically designed to act as an optional add-on to corosync for users who wanted AIS functionality. You will see a lot of references to OpenAIS while searching the web for information on clustering. Understanding it's evolution will hopefully help you avoid confusion. -- Digimer E-Mail: [email protected] AN!Whitepapers: http://alteeve.com Node Assassin: http://nodeassassin.org _______________________________________________ Openais mailing list [email protected] https://lists.linux-foundation.org/mailman/listinfo/openais
