[Linux-cluster] Options for fencing at the node level .

[Digimer]

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On 06/29/2012 01:16 PM, Redding, Erik wrote:
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>
> Erik Redding
> Systems Programmer, RHCE
> Core Systems
> Texas State University
>
> On Jun 28, 2012, at 10:01 PM, Digimer wrote:
>
>> On 06/28/2012 10:32 PM, Zama Ques wrote:
>>> Hi All ,
>>>
>>> I need to setup HA clustering using redhat cluster suite on two nodes ,
>>> primary concern being high availability . Before trying it on production
>>> , I am trying to configure the setup on two desktop machines . For
>>> storage , I am creating a partition and sharing the partition as a iscsi
>>> target on a third machine . Would like to know what are the options for
>>> fencing available at the node level  .  I tried going through the conga
>>> interface for creating a
>>> shared fence device , I could see one option is using GNBD . virtual
>>> machine fencing is there in the list but that is for xen based HA
>>> cluster . scsi fencing is there , but as far as what I understand it
>>> does not support iscsi target as of now. Manual fencing is also there ,
>>> and I am planning to use that , but would like to  know is there any
>>> other options are available for fencing at node level ?
>>>
>>> Thanks in Advance
>>> Zaman
>>
>> You need a real device that will power off the cluster node. If your
>> machines do not have IPMI, which desktops rarely ever do, you next best
>> option is a switched PDU. I have had excellent luck with APC AP7900 (or
>> your country's version of). The cluster can call this PDU and ask it to
>> turn off the power to the target node.
>>
>> Fencing requires a mechanism totally independent of the target. With
>> virtual machines, the host hypervisor can do this. For real machines
>> though, you need hardware.
>>
>> --
>> Digimer
>> Papers and Projects: https://alteeve.com
>>
>>
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Digimer
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