[Linux-cluster] How to avoid two-nodes clustersplit-brain withoutshared storage

[jumanjiman at gmail.com]

Look up "quorum disk". You can add a heuristic based on ping or just about any other shell command. The heuristic acts like a ghost node toward quorum. 
An actual disk is not needed.

-paul

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-----Original Message-----
From: Mockey Chen <mockey.chen at nsn.com>

Date: Mon, 09 Feb 2009 09:52:06 
To: linux clustering<linux-cluster at redhat.com>
Subject: Re: [Linux-cluster] How to avoid two-nodes cluster
	split-brain	withoutshared storage


Hi Barry Brimer,

Thanks your suggestion.
'tiebreaker ip', I searched the cluster documents, and only find the
definition of 'tiebreaker ip', but there is no description on how to
configure it.
Could you give some more detail about how to configure it.



ext Barry Brimer wrote:
> I believe you want to use the tiebreaker ip .. which should be set to
> the default gateway.  Presumably the machine that is malfunctioning
> would be unable to reach the gateway, while the one that is
> functioning correctly could.
>
> On Sat, 7 Feb 2009, Jeff Sturm wrote:
>
>> We faced the same question, and decided that for reliability, it was
>> best to add an inexpensive third node to a cluster.
>>
>> The third node need not run any cluster services (rgmanager, GFS, CLVM
>> etc.) other than fencing.  This is a far lower cost than adding shared
>> storage simply for a quorum disk.
>>
>>> -----Original Message-----
>>> From: linux-cluster-bounces at redhat.com
>>> [mailto:linux-cluster-bounces at redhat.com] On Behalf Of Mockey Chen
>>> Sent: Friday, February 06, 2009 3:18 AM
>>> To: linux clustering
>>> Subject: [Linux-cluster] How to avoid two-nodes cluster
>>> split-brain withoutshared storage
>>>
>>> Hi,
>>>
>>> I have a two node cluster, due to design limitation, there is
>>> no shared storage exist. So I can not use quorum disk.
>>>
>>> Is there any other reliable way to prevent split-brain?
>>> I searched google, but I can not found any solution suitable
>>> for my situation.
>>>
>>> Any comment is appreciated.
>>>
>>>
>>> Best Regards.
>>> Chen Ming
>>>
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>>> Linux-cluster mailing list
>>> Linux-cluster at redhat.com
>>> https://www.redhat.com/mailman/listinfo/linux-cluster
>>>
>>>
>>
>>
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>
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