Any Idea ?
On Sat, Mar 23, 2013 at 3:41 PM, Prathyush <prathyus...@gmail.com> wrote: > I have the below scenario, > I have made the first node down the service failover to second node,then I > switched off second node ,service again swiched to third node,the quorum > was not lost,it adjusted automatically > On Mar 22, 2013 9:11 PM, "Digimer" <li...@alteeve.ca> wrote: > >> This is correct. >> >> Quorum needs "50% + 1" of the votes. So in Prathyush's cluster of 3 >> nodes/3 votes; >> >> 3 / 2 == 1.5 rounded up is 2. >> >> So once the second node shut down, quorum was lost. With quorum lost, the >> remaining node will stop all of it's clustered services because it can no >> longer be sure what the other nodes are doing. For example, the other two >> nodes might turn back on, fail to connect to the one remaining node, decide >> they have quorum and start clustered services. This would lead to a split >> brain. >> >> If you want a 3-node cluster to work with just one node, consider adding >> a quorum disk, assuming you have a SAN. This would add 2 votes to the >> cluster. So the new math would be; >> >> 5/2 == 2.5 rounded up to 3. >> >> The quorum disk would give it's two votes to the remaining single node >> for a total of 3 votes, thus giving it quorum and allowing it to operate on >> it's own. >> >> digimer >> >> On 03/22/2013 03:16 AM, emmanuel segura wrote: >> >>> Hello >>> >>> If i understand well, you 3 node(3 total votes) and you poweroff 2, 3 - >>> 2 = 1(quorum loss) remain less 50% of votes >>> >>> can you show your config and your log, without it's so hard help you >>> >>> Thanks >>> >>> 2013/3/22 Prathyush <prathyus...@gmail.com <mailto:prathyus...@gmail.com >>> >**> >>> >>> HI, >>> >>> >>> I have 3 node cluster with 1 vote each ,and decided to shut down >>> the 2 nodes for maintenance . >>> When a proper power off /init 0 given to two of the nodes ,i never >>> loses the quorum >>> When i am making force power off (switching off the power/pulling >>> the power cable) quorum was lost and services failed in the third >>> node. >>> why this is happening... any idea >>> -- >>> /*Regards, >>> Prathyush*/ >>> >> >> >> -- >> 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? >> >> -- >> Linux-cluster mailing list >> Linux-cluster@redhat.com >> https://www.redhat.com/**mailman/listinfo/linux-cluster<https://www.redhat.com/mailman/listinfo/linux-cluster> >> > -- *Regards, Prathyush*
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