Jan, Two monitors should be just fine as long as both can agree to every action. Even number of monitors are not useful as the total number of failures tolerated will be the same as odd numbers. For example, 1,2 will not tolerate any failure and 3,4 both can tolerate 2 failures.
Thanks & Regards Somnath From: Jan Schermer [mailto:j...@schermer.cz] Sent: Tuesday, December 29, 2015 3:32 PM To: Ing. Martin Samek Cc: Somnath Roy; ceph-users@lists.ceph.com Subject: Re: [ceph-users] My OSDs are down and not coming UP Just try putting something like the following in ceph.conf: [global] mon_host =xxxx:xxxx:2:1612::50 xxxx:xxxx:2:1612::30 mon_initial_members = node-1 node-2 Also, I just noticed you have two MONs? It should always be an odd number. Not sure if they can ever get quorum now? Jan On 30 Dec 2015, at 00:15, Ing. Martin Samek <samek...@fel.cvut.cz<mailto:samek...@fel.cvut.cz>> wrote: I'm deploying ceph cluster manually following different guides. I didn't use ceph-deploy yet. MS: Dne 30.12.2015 v 00:13 Somnath Roy napsal(a): It should be monitor host names..If you are deploying with ceph-deploy it should be added in the conf file automatically..How are you creating your cluster ? Did you change conf file after installing ? From: Ing. Martin Samek [mailto:samek...@fel.cvut.cz] Sent: Tuesday, December 29, 2015 3:09 PM To: Jan Schermer Cc: Somnath Roy; ceph-users@lists.ceph.com<mailto:ceph-users@lists.ceph.com> Subject: Re: [ceph-users] My OSDs are down and not coming UP Hi, No, never. It is my first attempt, first ceph cluster i try ever run. im not sure, if "mon initial members" should contain mon servers ids or hostnames ? MS: Dne 30.12.2015 v 00:04 Jan Schermer napsal(a): Has the cluster ever worked? Are you sure that "mon initial members = 0" is correct? How do the OSDs know where to look for MONs? Jan On 29 Dec 2015, at 21:41, Ing. Martin Samek <samek...@fel.cvut.cz<mailto:samek...@fel.cvut.cz>> wrote: Hi, network is OK, all nodes are in one VLAN, in one switch, in one rack. tracepath6 node2 1?: [LOCALHOST] 0.030ms pmtu 1500 1: node2 0.634ms reached 1: node2 0.296ms reached Resume: pmtu 1500 hops 1 back 64 tracepath6 node3 1?: [LOCALHOST] 0.022ms pmtu 1500 1: node3 0.643ms reached 1: node3 1.065ms reached Resume: pmtu 1500 hops 1 back 64 There is no firewall installed or configured. Martin
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