Default params for quorumdisk

[Schaffrath, Rene]

Hi,

you need to configure fencing. If the two nodes can't see each other, they don't know in what state the other node is and thus halt every operation. If you configure fencing, one node will "shoot the other node in the head" (stonithd is used in linux-ha afaik), e.g. shut it down via ilo or an ups interface. The node only continues to operate, if the fence script notifies success.
This is a basic principle in any cluster solutions I know and is always a big problem in a 2-node cluster.

Hope this makes it clearer,
René

> -----Original Message-----
> From: redhat-list-bounces at redhat.com 
> [mailto:redhat-list-bounces at redhat.com] On Behalf Of ESGLinux
> Sent: Tuesday, May 26, 2009 2:03 PM
> To: General Red Hat Linux discussion list
> Subject: Re: Default params for quorumdisk
> 
> Hello,
> thanks for your answer. The first link is really usefull for me.
> 
> In short my problem is that when I unplug the network cable 
> of the service
> interface of one of the node, the two nodes halts. I have 
> looking for an
> explanation and I get this:
> 
> "CMAN keeps track of cluster quorum by monitoring the count of cluster
> nodes. If more than half the nodes are active, the cluster 
> has quorum. If
> half the nodes (or fewer) are active, the cluster does not 
> have quorum, and
> all cluster activity is stopped."
> 
> With a two nodes cluster it seams that it one fails, then the 
> cluster hasn´t
> quorum and the cluster stops.
> 
> So I decide to use quorum disk to see if this solve my 
> problem, but I´m not
> sure if this is the problem,
> 
> Greetings,
> 
> ESG
> 
> 
> 
> 
> 2009/5/26 Schaffrath, Rene <Rene.Schaffrath at mundipharma.de>
> 
> > Hi ESG,
> >
> > I'm definitely no fan of the RHEL Cluster Suite, so I'll 
> keep it short:
> >
> > must read if you use multipathing (timings):
> > http://kbase.redhat.com/faq/docs/DOC-2882
> >
> > You probably know it already:
> > http://sources.redhat.com/cluster/wiki/HomePage
> >
> > Perhaps we can help you more if you told us what your problems are.
> > I've gone through hell searching for problems in our 2-node 
> cluster and we
> > even booked a Red Hat consultant to solve our problems. But 
> still there are
> > some issues which give me a headache. Make sure you have 
> installed the
> > latest patches - there have been some terrible bugs in RHEL 
> 5 Cluster.
> >
> > Greetings,
> > René
> >
> > > -----Original Message-----
> > > From: redhat-list-bounces at redhat.com
> > > [mailto:redhat-list-bounces at redhat.com] On Behalf Of ESGLinux
> > > Sent: Tuesday, May 26, 2009 12:38 PM
> > > To: General Red Hat Linux discussion list
> > > Subject: Default params for quorumdisk
> > >
> > > Hi all,
> > >
> > > I have my problematic 2 nodes cluster and I want to test if
> > > using quorum
> > > disk helps me with my problem.
> > >
> > > I´m using luci to setup the quorumdisk and It ask for a 
> lot of params.
> > > As doc reference I use
> > > http://www.redhat.com/docs/manuals/enterprise/RHEL-5-manual/Cl
> > uster_Administration/s1-general-prop-conga-CA.html
> > > but there is not explanation about the default params,
> > >
> > > for example,
> > > Interval - The frequency of read/write cycles, in seconds.  I
> > > have not idea
> > > what to say to that. Which is the default and how can I answer it?
> > >
> > >
> > > The same with most of the params
> > >
> > >
> > > Greetings
> > >
> > > ESG
> > > --
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Amtsgericht Limburg (Lahn) HRA 624

Persönlich haftende Gesellschafterin:
Mundipharma Verwaltungsgesellschaft mbH, Sitz in Limburg (Lahn),
Registergericht Limburg (Lahn) HRB 462
Geschäftsführer: 
Mortimer D. Sackler M.D., Raymond R. Sackler M.D.,
Richard S. Sackler M.D., Kathe A. Sackler M.D.,
Jonathan D. Sackler M.D., Mortimer David A. Sackler,
Samantha S. Sackler-Hunt, Peter Boer, Åke Wikström,
Gunther Niederheide, Jürgen Feld (stellvertretend)
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