On 25/05/2013, at 2:15 AM, Digimer <li...@alteeve.ca> wrote: > On 05/24/2013 11:24 AM, Nick Khamis wrote: >> Was there not a time where corosync was a subset of OpenAIS? Namely, >> openais support for active/active and passive/active? I might have my >> channels mixed up, it's been a while.... >> >> @#linux-cluster and #linux-ha: Will do. >> >> Ninus Khamis (PhD) >> >> PS Sorry for the hijack!!!! >> > > Nope. Until RHEL 5, openais was the communication layer of the cluster. > However, the full AIS API was deemed "overkill" for what HA clustering > needed, so corosync was created for RHEL 6 as a stripped-down, HA focused > version of openais. In turn, openais was made a corosync plugin for those who > actually want the full AIS API.
Sort of. You're both right. The AIS APIs were always plugins. Essentially the core parts of OpenAIS were removed and called Corosync, while the plugins implementing the AIS APIs were left in place and deprecated. So in that sense, Ninus is correct. As for the "for RHEL" part, I think it was more a cost/benefit call by Steve who saw a lot of effort going into something that was largely unused. > > The concepts of "Active/Active", "Active/Passive", etc. is not a membership > or cluster communication layer question. Those concepts come from the > resource manager (rgmanager or pacemaker). More to the point, it's a > per-resource question. You can have a pacemaker cluster where some services > are Active/Active (ie: a GFS2 partition) while at the same time having an > Active/Passive resouce (ie: a VM). > > hth > > digimer > > -- > Digimer > Papers and Projects: https://alteeve.ca/w/ > What if the cure for cancer is trapped in the mind of a person without access > to education? > > _______________________________________________ > 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
