[Linux-cluster] two fencing devices per node

[James Parsons]

Brad Filipek wrote:

> I have a two node cluster and each node has two power supplies. Each 
> power supply is going to be plugged into a different APC switch. I 
> currently only have one power supply plugged in to one APC switch (for 
> testing purposes) and fencing works fine. Now I want to plug the 
> second power supply in. Do I need to add another fence level, or do I 
> just add a second fence device to the first fence level?
>
>  
>
> Thanks,
>
> Brad Filipek
>
>  
>
> *_Confidentiality Notice: _*This message is intended for the use of 
> the individual or entity to which it is addressed and may contain 
> information that is privileged, confidential and exempt from 
> disclosure under applicable law. If the reader of this message is not 
> the intended recipient or the employee or agent responsible for 
> delivering this message to the intended recipient, you are hereby 
> notified that any dissemination, distribution or copying of this 
> communication is strictly prohibited.
>
> If you have received this communication in error, please notify us 
> immediately by email reply or by telephone and immediately delete this 
> message and any attachments.
>
>------------------------------------------------------------------------
>
>--
>Linux-cluster mailing list
>Linux-cluster at redhat.com
>https://www.redhat.com/mailman/listinfo/linux-cluster
>
Add a second device to the same level, and use the 'option="Off"' and 
'option="On"' attributes to make certain both power supplies are 
completely shut off before turning either one on again. Without setting 
the option attribute, the default is Reboot. It would look like this:

.....
  <fence>
    <method name="1">
        <device name="my_apc" port="1" option="Off"/>
        <device name="my_apc" port="2" option="Off"/>
        <device name="my_apc" port="1" option="On"/>
        <device name="my_apc" port="2" option="On"/>
    </method>
  </fence>

If you are using one of the GUI tools, it should be smart enough to 
detect that you are using two power switch type devices in the same 
level and add the option attributes for you. ..all you need to do is 
specify the device names and the ports.

-J