[DRBD-user] Off-site Quorum Provider?

Florian Haas florian at hastexo.com
Fri Mar 2 23:24:54 CET 2012

Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.


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

-- 
Need help with High Availability?
http://www.hastexo.com/now



More information about the drbd-user mailing list