Re: Options for fencing at the node level .

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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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