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Re: [MooseFS-Users] Multi-Master setup - Failover not working
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From: Bernd B. <b....@ho...> - 2015-08-18 13:44:38
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Hello Piotr Robert, thanks for your answer. I was already told this by you in an other email. i got 5 chunkservers and 2 Master working as separate physical maschines in my setup now. The tests so far were fine an i am 1 test away from purchasing I will do another Stress Test to see a complete powerup off my cluster. I hope the moosfs system behaves ok. 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 ------------------------------------------------------------ Am 17.08.2015 um 19:04 schrieb Piotr Robert Konopelko: > 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... >> <mailto: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 > |
