[Linux-cluster] RHEL 4: quorate or inquorate

[Dex Chen]

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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