[Pacemaker] stonith and avoiding split brain in two nodes cluster

emmanuel segura emi2fast at gmail.com
Mon Mar 25 09:09:16 EDT 2013

I have a production cluster, using two vm on esx cluster, for stonith i'm
using sbd, everything work find

2013/3/25 Angel L. Mateo <amateo at um.es>

> Hello,
>         I am newbie with pacemaker (and, generally, with ha clusters). I
> have configured a two nodes cluster. Both nodes are virtual machines
> (vmware esx) and use a shared storage (provided by a SAN, although access
> to the SAN is from esx infrastructure and VM consider it as scsi disk). I
> have configured clvm so logical volumes are only active in one of the nodes.
>         Now I need some help with the stonith configuration to avoid data
> corrumption. Since I'm using ESX virtual machines, I think I won't have any
> problem using external/vcenter stonith plugin to shutdown virtual machines.
>         My problem is how to avoid split brain situation with this
> configuration, without configuring a 3rd node. I have read about quorum
> disks, external/sbd stonith plugin and other references, but I'm too
> confused with all this.
>         For example, [1] mention techniques to improve quorum with scsi
> reserve or quorum daemon, but it didn't point to how to do this pacemaker.
> Or [2] talks about external/sbd.
>         Any help?
> PS: I have attached my corosync.conf and crm configure show outputs
> [1] http://techthoughts.typepad.**com/managing_computers/2007/**
> 10/split-brain-quo.html<http://techthoughts.typepad.com/managing_computers/2007/10/split-brain-quo.html>
> [2] http://www.gossamer-threads.**com/lists/linuxha/pacemaker/**78887<http://www.gossamer-threads.com/lists/linuxha/pacemaker/78887>
> --
> Angel L. Mateo Martínez
> Sección de Telemática
> Área de Tecnologías de la Información
> y las Comunicaciones Aplicadas (ATICA)
> http://www.um.es/atica
> Tfo: 868889150
> Fax: 868888337
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