>-------- Оригинално писмо -------- >От: [EMAIL PROTECTED] >Относно: Re: [Linux-HA] quorumd - is anyone using it? >До: [email protected] >Изпратено на: Събота, 2008, Март 1 13:30:28 EET >---------------------------------- > >> Hi all, >> >> is anyone actually using the quorum daemon? >> >> My assessment seems to suggest that it is not workable in any scenario; >> but maybe I have missed something? >> >> If not and I'm right, I am afraid that users might actually deploy it, >> thinking it solves something and then be very upset when it fails under >> fire. Possibly, the prudent action at this time is to disable it from >> the package and build by default, until it is completed. > >I thought it is essential for any cluster with an even amount of nodes? >How would you decide DR in a split-brain condition of two nodes without a >quorum server? Is it possible?
Yes, is possible. If you have 2 nodes just join a third node to the cluster without running any resources on it. There you go you have quorum without quorum server. I beleive the quorum server idea is not that simple to use it only when you have even number of nodes. Quorum server should be used in DR when you have 2 separate data centers. Quorum server must decide which site is down and grant quorum to the other one, even if it has less nodes. Imagine you have 5 nodes cluster. 3 nodes in site A, 2 nodes in site B. Network between both sites is down so site A has majority quorum thus continue to run the service. But what happens if site A is down? Site B must takeover the sevice but it has not majoroty quorum - 2 nodes only! Here comes the Quorum server. Site B contacts the quorum server (change in membership is detected). Quorum server has lost connection to the site A therefore it grants quorum to site B. Unfortunatelly Quorum server does not work in 2.1.3. I hope it get fixed ASAP. Regards, Atanas > >Cheers, >Holger > >> Regards, >> Lars >> >> -- >> Teamlead Kernel, SuSE Labs, Research and Development >> SUSE LINUX Products GmbH, GF: Markus Rex, HRB 16746 (AG Nьrnberg) >> "Experience is the name everyone gives to their mistakes." -- Oscar Wilde > >_______________________________________________ >Linux-HA mailing list >[email protected] >http://lists.linux-ha.org/mailman/listinfo/linux-ha >See also: http://linux-ha.org/ReportingProblems > _______________________________________________ Linux-HA mailing list [email protected] http://lists.linux-ha.org/mailman/listinfo/linux-ha See also: http://linux-ha.org/ReportingProblems
