[Linux-cluster] RHEL 4: quorate or inquorate
Dex Chen
dex.chen at crosswalkinc.com
Thu Apr 12 21:08:27 UTC 2007
Thanks for the response.
I figured out the cause. I used "cman_tool leave remove" when I shutdown
the other 2 nodes. In this way, the remaining one/cluster had "quorum:
1, and expected vote 1". I was surprised that the "2 node cluster"
special case did not prevent this.
My remaining question is:
Do you see any potential risks such as "split brain" when the stopped
nodes come back, especially in a more-node cluster (say 5 node cluster)?
Thanks,
Dex
-----Original Message-----
From: linux-cluster-bounces at redhat.com
[mailto:linux-cluster-bounces at redhat.com] On Behalf Of Lon Hohberger
Sent: Thursday, April 12, 2007 12:34 PM
To: linux clustering
Subject: Re: [Linux-cluster] RHEL 4: quorate or inquorate
On Tue, Apr 10, 2007 at 12:27:29PM -0600, Dex Chen wrote:
> Hi, all:
>
> We saw a rare situation that a 3 node cluster has 2 nodes offline, but
> it maintains quorum. Is there anyone has any idea how it could happen
> and what/where I should look into.
>
> Here is the output from clustat on one of the nodes:
>
> Member Status: Quorate
>
> Member Name Status
> ------ ---- ------
> lizard01 Offline
> lizard02 Online, Local, rgmanager
> lizard03 Offline
>
> Service Name Owner (Last) State
> ------- ---- ----- ------ -----
> 192.168.210.121 lizard02 started
> 192.168.210.122 lizard02 started
> 192.168.210.123 lizard02 started
> 192.168.210.124 lizard02 started
>
>
> We are on REHL 2.6.9-34 (update 4).
Could you include:
cman_tool status
cman_tool nodes
You can do this if you are using qdisk, but it's not generally supposed
to happen.
-- Lon
--
Lon Hohberger - Software Engineer - Red Hat, Inc.
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