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Re: [Linux-cluster] What if the fence device doesn't work?



Janne Peltonen wrote:
On Tue, Nov 21, 2006 at 09:20:20AM -0500, Eric Kerin wrote:
Janne Peltonen wrote:
And here's an example block from the cluster.conf file first it tries ilo (HP Lights Out), and if that fails, apc (APC Network power controller) (the ILO sections is probably not correct, I just thew it in there as an example of how you'd setup the method tags):
                       <fence>
                               <method name="ilo">
<device name="server1-ilo" option="off"/> <device name="server1-ilo" option="on"/>
                               </method>
                               <method name="apc">
<device name="APC01a" port="1" option="off"/> <device name="APC01b" port="1" option="off"/> <device name="APC01a" port="1" option="on"/> <device name="APC01b" port="1" option="on"/>
                               </method>

                       </fence>

Ok, I tried a similar config and it works fine. Thanks again. One
obstacle less on our way to a xen-csgfs-clustered imap server :)

One thing, though: if the APC controller in the above config fails, it's
still a SPOF. Or is there still something I'm missing?-)

Well, first it tries ilo. If that fails, it uses the APC. If that fails, then we have a multipoint failure, and obviously protecting against multipoint failure costs a lot more than protecting against a single point failure...

Thanks,
Eric Kerin
eric bootseg com


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