Default params for quorumdisk

[ESGLinux]

2009/5/26 Marti, Rob <RJM002 at shsu.edu>

> _______________________________________
> From: redhat-list-bounces at redhat.com [redhat-list-bounces at redhat.com] On
> Behalf Of ESGLinux [esggrupos at gmail.com]
> Sent: Tuesday, May 26, 2009 07:02
> 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
> _______________________________________
>
> Do you have it set for a two node cluster?


Hello, not at all, I haven´t configured multipathing.

I´m now testing on a Xen enviroment with this:
I create the quorom disk:

 mkqdisk -L
mkqdisk v0.6.0
/dev/disk/by-id/scsi-S_beaf11-part1:
/dev/disk/by-path/ip-192.168.1.191:3260-iscsi-iqn.2001-04.com.example:storage.disk2.amiens.sys1.xyz-lun-1-part1:
/dev/sda1:
        Magic:                eb7a62c2
        Label:                quorumdisk
        Created:              Tue May 26 13:31:19 2009
        Host:                 NODOXEN1
        Kernel Sector Size:   512
        Recorded Sector Size: 512


and in the cluster.conf I have setup this:

<quorumd interval="10" label="quorumdisk" min_score="1" tko="10" votes="1"/>

the values are to test, I don´t know if they are good.

What I have seen is that it works better than when I havent this quoromdisk.

look what happened now when I unplug one node:

May 26 14:16:15 NODOXEN1 openais[1802]: [CLM  ] got nodejoin message
192.168.100.2
May 26 14:16:15 NODOXEN1 openais[1802]: [CLM  ] got nodejoin message
192.168.100.3
May 26 14:16:15 NODOXEN1 openais[1802]: [CPG  ] got joinlist message from
node 1
May 26 14:16:21 NODOXEN1 qdiskd[1830]: <info> Node 2 shutdown
May 26 14:16:22 NODOXEN1 openais[1802]: [CMAN ] lost contact with quorum
device
May 26 14:16:26 NODOXEN1 kernel: dlm: connecting to 2
May 26 14:18:01 NODOXEN1 qdiskd[1830]: <info> Assuming master role

I think this can be the answer to all of my problems,

I´ll continue investigating,

Greetings

ESG





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