On Fri, Mar 2, 2012 at 11:21 PM, Digimer <[email protected]> wrote: > On 03/02/2012 04:41 PM, Robinson, Eric wrote: >> We have two geographically separate data centers connected by 4 x >> Gigabit links (in 2 trunks). Our HA clusters are distributed between the >> data centers, with each node of a 2-node cluster in a separate data >> center. (In the case of our 3-node clusters, 2 nodes are in one data >> center and the 3rd node is in the other data center.) Cluster membership >> information is communicated though both of the Gigabit trunks, where >> each trunk is a separate Corosync ring. DRBD is replicated through one >> of the trunks. >> >> Question: If the links between the data centers are severed, split brain >> will occur. What is the best way to provide quorum from a third location >> out on the Internet? >> >> Note: I posted this question to the Linux HA list, too, because I was >> not sure which was better suited. >> >> -- >> >> Eric Robinson > > Couple of comments; > > As-is, quorum can't be gained without simple majority. Thus, in a > partition, your location with just one node can not become quorate.
See my response on the linux-ha list. For clarification; we're not talking about a single Corosync membership here. booth does quorum arbitration over several Pacemaker "sites", where each site is a self-contained Corosync membership. Florian -- Need help with High Availability? http://www.hastexo.com/now _______________________________________________ drbd-user mailing list [email protected] http://lists.linbit.com/mailman/listinfo/drbd-user
