Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
On 03/02/2012 05:24 PM, Florian Haas wrote: > On Fri, Mar 2, 2012 at 11:21 PM, Digimer <linux at alteeve.com> 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 Ah, ok -- Digimer E-Mail: digimer at alteeve.com Papers and Projects: https://alteeve.com