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Re: [MooseFS-Users] Multi-Master setup - Failover not working
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From: Piotr R. K. <pio...@mo...> - 2015-08-17 17:04:41
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Hi Bernd, > I have the following questions to that > > 1. Do i have to have the master software on separate hardware to the chunks ? so that master and chunk servers are physically spit systems ? No, you don’t have to, but it is recommended to have machines dedicated for Master Servers. > 2. If that is the case how can i deal in a 2 storage Room situation with 2 UPS Systems and Master and Chunk Server on the same ups > Do i experience the same behavior ihe if i loose one UPS System amd with that 1 server with master service and one server vith chunk service? Problem you encounter is caused, because to run MooseFS with HA feature, you need to have minimum 3 chunkservers. In case of one master failure (e.g. as you said - powerloss), MooseFS uses a quorum mechanism. So you need to have quorum of chunkservers, i.e. a half + 1 to choose a Leader Master. When you poweroff one of your two chunkservers you have, you loss quorum (2/2+1 = 2, so quorum of 2 chunkservers is 2). PS: I’m sorry for so late answer, but our mailing list sometimes holds messages for some time. Best regards, -- Piotr Robert Konopelko MooseFS Technical Support Engineer | moosefs.com <https://moosefs.com/> > On 23 Jul 2015, at 6:31 pm, Bernd Burg <b....@ho...> wrote: > > Hallo togehter > > First of all, Thanks to sales i am able to have a test License for the Pro versions 3.0.38 > > i did set up 2 Servers as shared Master and Chunkserver with 5 Disks each from scratch (no Metalogger) > I have 3 Proxmox Servers which i set up with moosfs-pro-clients > I changed my dns-server in the way, that it displays > > ------------------------------------------------------------------- > root@proxmox-4:~# host mfsmaster > mfsmaster.holde.lan has address 10.120.3.162 > mfsmaster.holde.lan has address 10.120.3.161 > ------------------------------------------------------------------- > > In this setup the system works as expected with a very good performance > > If i stop the leader with mfsmaster stop the follower ist promoted to master > If i start the old leader again with mfsmaster start that machine is denoted as follower > > so far so good and exected. > > What i don't unterstand is the following behaviour > > > Status before test: > ------------------------------------------------------------------------------ > root@mfsmaster1:~# mfssupervisor > 1 (10.120.3.161:9419) : FOLLOWER (leader ip: 10.120.3.162 ; meta version: 126865 ; synchronized ; duration: 1511) > 2 (10.120.3.162:9419) : LEADER (meta version: 126865 ; duration: 1504) > ------------------------------------------------------------------------ > > mfsmaster1 is ip:xxx.161 > mfsmaster2 is ip:xxx.162 > > > If i poweroff the leader (machine 162) Then i have this result > > ------------------------------------------------------------------------------- > root@mfsmaster1:~# mfssupervisor > 10.120.3.162: connection timed out > master states: > 1 (10.120.3.161:9419) : ELECT (meta version: 127149 ; synchronized ; duration: 96) > 2 (10.120.3.162:9419) : DEAD > ------------------------------------------------------------------------------------- > The cgi shows additionally the message: > > ------------------------------------------------------------------ > Leader master server not found, but there is an elect, so make sure that all chnunkservers are running - elect should became a leader soon > ------------------------------------------------------------------ > > This stays like this until the server is powered on again. There was no change for over 15 min then i powereup the machine (162) again > > -------------------------------------------------------------------------------------------- > 1 (10.120.3.161:9419) : LEADER (meta version: 127253 ; duration: 63) > 2 (10.120.3.162:9419) : FOLLOWER (leader ip: 10.120.3.161 ; meta version: 127253 ; synchronized ; duration: 69) > -------------------------------------------------------------------------------------------------------------- > > > This is in both ways > > I have the following questions to that > > 1. Do i have to have the master software on separate hardware to the chunks ? so that master and chunk servers are physically spit systems ? > > 2. If that is the case how can i deal in a 2 storage Room situation with 2 UPS Systems and Master and Chunk Server on the same ups > Do i experience the same behavior ihe if i loose one UPS System amd with that 1 server with master service and one server vith chunk service? > > > I would be very thankful if somebody could give me a hint > > Thanks in advance > > -- > > Mit freundlichen Grüßen > > Bernd Burg > > ------------------------------------------------------------ > HOLDE AG > Zum Roppertsborn 14, 66646 Marpingen > > Telefon +49-6827-267988-0 > Telefax +49-6827-267988-9 > > Email b....@ho... <mailto:kr...@ac...> > > Sitz der Gesellschaft: Marpingen > AG Saarbrücken, HRB 101630 > Ust-Id-Nr.: DE29460253 > > Vorstand: > Dipl.-Ing. Bernd Burg > > Aufsichtsrat: > Dipl.-Ing. Axel Gaus (Vorsitz) > Dipl.-Ing. Andreas Krolzig > Dipl.-Ing. Gabor Richter > ------------------------------------------------------------ > > ------------------------------------------------------------------------------ > _________________________________________ > moosefs-users mailing list > moo...@li... <mailto:moo...@li...> > https://lists.sourceforge.net/lists/listinfo/moosefs-users <https://lists.sourceforge.net/lists/listinfo/moosefs-users> |
