[Linux-cluster] Quorum

[mogruith]

Hi all

Hi Brem and thanks for your answer.

When I moved manually my service, it work then I thought my quorum was
used. But it seems not in fact. Even if the case "has quorate" was
checked in system-config-cluster.

I have a special vlan dedicated for a heartbeat link between my two
nodes. 

In fact, I have three vlan for my cluster, one for production
(192.168.104.), one for admin (192.168.50.) and the last one for the
heartbeat (192.168.30)(network only dedicated for my nodes). But you
said :

"Currently supported, only the clusternode (cluster.conf) corresponding
IP addresses are used for heartbeating.
Multiple heartbeat interfaces, referred as multiring is technicaly
possiblebut not "yet" supported"

Does it mean I can't define several different IP adress in my
cluster.conf ?
Then what about multicast ? Could I define there my "heartbeat IP" ? 
In reality, i "must" have an ip adress on each nodes dedicated for the
heartbeat link...

Another question : how to set directly in cluster.conf that my point of
mount will have to use gfs2 and not gfs ? Because in
system-config-cluster, gfs2 is not present. I have to modify
cluster.conf with vi and propagate it manually. Luci knows gfs2.

Sorry if I'm not clear ... :)


mog
 

Le samedi 06 mars 2010 à 00:14 +0100, brem belguebli a écrit :
> On Fri, 2010-03-05 at 21:18 +0100, mogruith wrote:
> > Hi all
> > 
> > Today, my cluster crashed, then I have several questions to ask .
> > 
> > 
> > - First of all, is there a kind of "heartbeat" on a quorum disk ? If
> > yes, it means, I have two heartbeat on my cluster, one by the quorum,
> > second one by a network link. Is it right ?
> qdisk is definitely a heartbeat vector. Nodes regularly, at configured
> interval value, write to a status block which modifies the timestamp. 
> cf man qdisk, chapter 2.1 Heartbeating and liveliness determination
> 
> > 
> > - How to set the heartbeat link in my cluster conf ? Is the "monitor
> > link" is a heartbeat when I set an IP adress to my service ? I have 2
> > cards just for the heartbeat network and I have two others cards for
> > another vlans.
> > 
> Currently supported, only the clusternode (cluster.conf) corresponding
> IP addresses are used for heartbeating.
> Multiple heartbeat interfaces, referred as multiring is technicaly
> possiblebut not "yet" supported.  
> > - I use mkqdisk to configure my quorum disk. My two nodes were able to
> > see it (I used mkqdisk -L on each node). My cluster was quorate. But
> > when I killed my first node, the second one didn't take the service and
> > the cluster told me it was inquorate ( Cluster is not quorate. Refusing
> > connection. Error while processing connect: Connection refused). 
> > 
> If using qdisk in a 2 nodes cluster, two_nodes setting (cluster.conf)
> must be =0.
> Quorum depends on the number of votes you gave to each node and to the
> quorum.
> Cluster is quorate if number of active votes > 50% of the expected votes
> (greater than)
> mkqdisk is not sufficient, the qdisk device must also be defined in the
> cluster.conf.  
> > Then service was down and cluster was strange. ccsd and qdiskd were
> > still running.
> > 
> > I relocated service manually and everything was right. Service moved to
> > a node to another one without any problem.
> > 
> How could you relocate the server manually if the cluster was not
> quorate ?
> > Well .. thanks for your help.
> > 
> > mog
> > 
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> 
> 
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