> >-------- Îðèãèíàëíî ïèñìî -------- > >Îò: [EMAIL PROTECTED] > >Îòíîñíî: Re: [Linux-HA] quorumd - is anyone using it? > >Äî: linux-ha@lists.linux-ha.org > >Èçïðàòåíî íà: Ñúáîòà, 2008, Ìàðò 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.
Hm okay and what if the uneven node (3. or 5. or 7...) is off for maintenance. I am having an even node cluster again with the possibility of an evil even split-brain condition.. Is there no reliable way to solve this? Because of that I thought its the job of the quorum server. Cheers, Holger > Regards, > Atanas > > > > > >Cheers, > >Holger > > > >> Regards, > >> Lars > >> > >> -- > >> Teamlead Kernel, SuSE Labs, Research and Development > >> SUSE LINUX Products GmbH, GF: Markus Rex, HRB 16746 (AG Nürnberg) > >> "Experience is the name everyone gives to their mistakes." -- Oscar > Wilde > > > >_______________________________________________ > >Linux-HA mailing list > >Linux-HA@lists.linux-ha.org > >http://lists.linux-ha.org/mailman/listinfo/linux-ha > >See also: http://linux-ha.org/ReportingProblems > > > _______________________________________________ > Linux-HA mailing list > Linux-HA@lists.linux-ha.org > http://lists.linux-ha.org/mailman/listinfo/linux-ha > See also: http://linux-ha.org/ReportingProblems > _______________________________________________ Linux-HA mailing list Linux-HA@lists.linux-ha.org http://lists.linux-ha.org/mailman/listinfo/linux-ha See also: http://linux-ha.org/ReportingProblems
